From 687767af728ce111a7aa24f74cd9068aedb2ab18 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Esteban=20K=C3=BCber?= Date: Fri, 29 May 2020 15:09:43 -0700 Subject: [PATCH 01/11] Suggest substituting `'static` lifetime in impl/dyn `Trait + 'static` return types --- .../nice_region_error/static_impl_trait.rs | 64 ++++++++-- src/librustc_middle/ty/context.rs | 13 +- src/librustc_middle/ty/diagnostics.rs | 8 +- ...t_outlive_least_region_or_bound.nll.stderr | 38 +++++- .../must_outlive_least_region_or_bound.rs | 21 ++++ .../must_outlive_least_region_or_bound.stderr | 117 ++++++++++++++++-- 6 files changed, 232 insertions(+), 29 deletions(-) diff --git a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs index f4c86ddae604..88d6c23d5144 100644 --- a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs +++ b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs @@ -4,6 +4,7 @@ use crate::infer::error_reporting::msg_span_from_free_region; use crate::infer::error_reporting::nice_region_error::NiceRegionError; use crate::infer::lexical_region_resolve::RegionResolutionError; use rustc_errors::{Applicability, ErrorReported}; +use rustc_hir::{GenericBound, ItemKind, Lifetime, LifetimeName, TyKind}; use rustc_middle::ty::RegionKind; impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { @@ -20,8 +21,9 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { ) = error.clone() { let anon_reg_sup = self.tcx().is_suitable_region(sup_r)?; - let (fn_return_span, is_dyn) = - self.tcx().return_type_impl_or_dyn_trait(anon_reg_sup.def_id)?; + let fn_return = self.tcx().return_type_impl_or_dyn_trait(anon_reg_sup.def_id)?; + let is_dyn = matches!(fn_return.kind, TyKind::TraitObject(..)); + let fn_return_span = fn_return.span; if sub_r == &RegionKind::ReStatic { let sp = var_origin.span(); let return_sp = sub_origin.span(); @@ -67,12 +69,58 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { lifetime, ); // FIXME: account for the need of parens in `&(dyn Trait + '_)` - err.span_suggestion_verbose( - fn_return_span.shrink_to_hi(), - &msg, - format!(" + {}", lifetime_name), - Applicability::MaybeIncorrect, - ); + match fn_return.kind { + TyKind::Def(item_id, _) => { + let item = self.tcx().hir().item(item_id.id); + let opaque = if let ItemKind::OpaqueTy(opaque) = &item.kind { + opaque + } else { + err.emit(); + return Some(ErrorReported); + }; + let (span, sugg) = opaque + .bounds + .iter() + .filter_map(|arg| match arg { + GenericBound::Outlives(Lifetime { + name: LifetimeName::Static, + span, + .. + }) => Some((*span, lifetime_name.clone())), + _ => None, + }) + .next() + .unwrap_or_else(|| { + ( + fn_return_span.shrink_to_hi(), + format!(" + {}", lifetime_name), + ) + }); + + err.span_suggestion_verbose( + span, + &msg, + sugg, + Applicability::MaybeIncorrect, + ); + } + TyKind::TraitObject(_, lt) => { + let (span, sugg) = match lt.name { + LifetimeName::ImplicitObjectLifetimeDefault => ( + fn_return_span.shrink_to_hi(), + format!(" + {}", lifetime_name), + ), + _ => (lt.span, lifetime_name), + }; + err.span_suggestion_verbose( + span, + &msg, + sugg, + Applicability::MaybeIncorrect, + ); + } + _ => {} + } } err.emit(); return Some(ErrorReported); diff --git a/src/librustc_middle/ty/context.rs b/src/librustc_middle/ty/context.rs index d5be3508d2d8..4770993d9cb0 100644 --- a/src/librustc_middle/ty/context.rs +++ b/src/librustc_middle/ty/context.rs @@ -1383,7 +1383,10 @@ impl<'tcx> TyCtxt<'tcx> { }) } - pub fn return_type_impl_or_dyn_trait(&self, scope_def_id: DefId) -> Option<(Span, bool)> { + pub fn return_type_impl_or_dyn_trait( + &self, + scope_def_id: DefId, + ) -> Option<&'tcx hir::Ty<'tcx>> { let hir_id = self.hir().as_local_hir_id(scope_def_id.expect_local()); let hir_output = match self.hir().get(hir_id) { Node::Item(hir::Item { @@ -1429,15 +1432,17 @@ impl<'tcx> TyCtxt<'tcx> { let output = self.erase_late_bound_regions(&sig.output()); if output.is_impl_trait() { let fn_decl = self.hir().fn_decl_by_hir_id(hir_id).unwrap(); - Some((fn_decl.output.span(), false)) + if let hir::FnRetTy::Return(ty) = fn_decl.output { + return Some(ty); + } } else { let mut v = TraitObjectVisitor(vec![]); rustc_hir::intravisit::walk_ty(&mut v, hir_output); if v.0.len() == 1 { - return Some((v.0[0], true)); + return Some(v.0[0]); } - None } + None } _ => None, } diff --git a/src/librustc_middle/ty/diagnostics.rs b/src/librustc_middle/ty/diagnostics.rs index 2e9aa724ac5a..3ca506fe0d59 100644 --- a/src/librustc_middle/ty/diagnostics.rs +++ b/src/librustc_middle/ty/diagnostics.rs @@ -236,21 +236,21 @@ pub fn suggest_constraining_type_param( } } -pub struct TraitObjectVisitor(pub Vec); -impl<'v> hir::intravisit::Visitor<'v> for TraitObjectVisitor { +pub struct TraitObjectVisitor<'tcx>(pub Vec<&'tcx hir::Ty<'tcx>>); +impl<'v> hir::intravisit::Visitor<'v> for TraitObjectVisitor<'v> { type Map = rustc_hir::intravisit::ErasedMap<'v>; fn nested_visit_map(&mut self) -> hir::intravisit::NestedVisitorMap { hir::intravisit::NestedVisitorMap::None } - fn visit_ty(&mut self, ty: &hir::Ty<'_>) { + fn visit_ty(&mut self, ty: &'v hir::Ty<'v>) { if let hir::TyKind::TraitObject( _, hir::Lifetime { name: hir::LifetimeName::ImplicitObjectLifetimeDefault, .. }, ) = ty.kind { - self.0.push(ty.span); + self.0.push(ty); } } } diff --git a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.nll.stderr b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.nll.stderr index 1806d2607a3a..ca9ca8a9debe 100644 --- a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.nll.stderr +++ b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.nll.stderr @@ -26,7 +26,34 @@ LL | fn explicit<'a>(x: &'a i32) -> impl Copy + 'a { x } | ^^^^^^^^^^^^^^ error: lifetime may not live long enough - --> $DIR/must_outlive_least_region_or_bound.rs:12:69 + --> $DIR/must_outlive_least_region_or_bound.rs:9:46 + | +LL | fn elided2(x: &i32) -> impl Copy + 'static { x } + | - ^ returning this value requires that `'1` must outlive `'static` + | | + | let's call the lifetime of this reference `'1` + | + = help: consider replacing `'1` with `'static` + +error: lifetime may not live long enough + --> $DIR/must_outlive_least_region_or_bound.rs:12:55 + | +LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x } + | -- lifetime `'a` defined here ^ returning this value requires that `'a` must outlive `'static` + | + = help: consider replacing `'a` with `'static` + = help: consider replacing `'a` with `'static` + +error[E0621]: explicit lifetime required in the type of `x` + --> $DIR/must_outlive_least_region_or_bound.rs:15:41 + | +LL | fn foo<'a>(x: &i32) -> impl Copy + 'a { x } + | ---- ^ lifetime `'a` required + | | + | help: add explicit lifetime `'a` to the type of `x`: `&'a i32` + +error: lifetime may not live long enough + --> $DIR/must_outlive_least_region_or_bound.rs:33:69 | LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x } | -- lifetime `'a` defined here ^ returning this value requires that `'a` must outlive `'static` @@ -35,7 +62,7 @@ LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x } = help: consider replacing `'a` with `'static` error: lifetime may not live long enough - --> $DIR/must_outlive_least_region_or_bound.rs:17:61 + --> $DIR/must_outlive_least_region_or_bound.rs:38:61 | LL | fn move_lifetime_into_fn<'a, 'b>(x: &'a u32, y: &'b u32) -> impl Fn(&'a u32) { | -- -- lifetime `'b` defined here ^^^^^^^^^^^^^^^^ opaque type requires that `'b` must outlive `'a` @@ -45,13 +72,14 @@ LL | fn move_lifetime_into_fn<'a, 'b>(x: &'a u32, y: &'b u32) -> impl Fn(&'a u32 = help: consider adding the following bound: `'b: 'a` error[E0310]: the parameter type `T` may not live long enough - --> $DIR/must_outlive_least_region_or_bound.rs:22:51 + --> $DIR/must_outlive_least_region_or_bound.rs:43:51 | LL | fn ty_param_wont_outlive_static(x: T) -> impl Debug + 'static { | ^^^^^^^^^^^^^^^^^^^^ | = help: consider adding an explicit lifetime bound `T: 'static`... -error: aborting due to 5 previous errors +error: aborting due to 8 previous errors -For more information about this error, try `rustc --explain E0310`. +Some errors have detailed explanations: E0310, E0621. +For more information about an error, try `rustc --explain E0310`. diff --git a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.rs b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.rs index 00f3490991b5..beafe9258209 100644 --- a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.rs +++ b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.rs @@ -6,6 +6,27 @@ fn elided(x: &i32) -> impl Copy { x } fn explicit<'a>(x: &'a i32) -> impl Copy { x } //~^ ERROR cannot infer an appropriate lifetime +fn elided2(x: &i32) -> impl Copy + 'static { x } +//~^ ERROR cannot infer an appropriate lifetime + +fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x } +//~^ ERROR cannot infer an appropriate lifetime + +fn foo<'a>(x: &i32) -> impl Copy + 'a { x } +//~^ ERROR explicit lifetime required in the type of `x` + +fn elided3(x: &i32) -> Box { Box::new(x) } +//~^ ERROR cannot infer an appropriate lifetime + +fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } +//~^ ERROR cannot infer an appropriate lifetime + +fn elided4(x: &i32) -> Box { Box::new(x) } +//~^ ERROR explicit lifetime required in the type of `x` + +fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } +//~^ ERROR cannot infer an appropriate lifetime + trait LifetimeTrait<'a> {} impl<'a> LifetimeTrait<'a> for &'a i32 {} diff --git a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr index d7dae6a08a7b..525e271bea9c 100644 --- a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr +++ b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr @@ -27,7 +27,43 @@ LL | fn explicit<'a>(x: &'a i32) -> impl Copy + 'a { x } | ^^^^ error: cannot infer an appropriate lifetime - --> $DIR/must_outlive_least_region_or_bound.rs:12:69 + --> $DIR/must_outlive_least_region_or_bound.rs:9:46 + | +LL | fn elided2(x: &i32) -> impl Copy + 'static { x } + | ---- ------------------- ^ ...and is captured here + | | | + | | ...is required to be `'static` by this... + | data with this lifetime... + | +help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 9:1 + | +LL | fn elided2(x: &i32) -> impl Copy + '_ { x } + | ^^ + +error: cannot infer an appropriate lifetime + --> $DIR/must_outlive_least_region_or_bound.rs:12:55 + | +LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x } + | ------- ------------------- ^ ...and is captured here + | | | + | | ...is required to be `'static` by this... + | data with this lifetime... + | +help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the lifetime `'a` as defined on the function body at 12:14 + | +LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'a { x } + | ^^ + +error[E0621]: explicit lifetime required in the type of `x` + --> $DIR/must_outlive_least_region_or_bound.rs:15:24 + | +LL | fn foo<'a>(x: &i32) -> impl Copy + 'a { x } + | ---- ^^^^^^^^^^^^^^ lifetime `'a` required + | | + | help: add explicit lifetime `'a` to the type of `x`: `&'a i32` + +error: cannot infer an appropriate lifetime + --> $DIR/must_outlive_least_region_or_bound.rs:33:69 | LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x } | ------- -------------------------------- ^ ...and is captured here @@ -35,13 +71,13 @@ LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x } | | ...is required to be `'static` by this... | data with this lifetime... | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the lifetime `'a` as defined on the function body at 12:15 +help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the lifetime `'a` as defined on the function body at 33:15 | -LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static + 'a { x } - | ^^^^ +LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'a { x } + | ^^ error[E0623]: lifetime mismatch - --> $DIR/must_outlive_least_region_or_bound.rs:17:61 + --> $DIR/must_outlive_least_region_or_bound.rs:38:61 | LL | fn move_lifetime_into_fn<'a, 'b>(x: &'a u32, y: &'b u32) -> impl Fn(&'a u32) { | ------- ^^^^^^^^^^^^^^^^ @@ -50,14 +86,79 @@ LL | fn move_lifetime_into_fn<'a, 'b>(x: &'a u32, y: &'b u32) -> impl Fn(&'a u32 | this parameter and the return type are declared with different lifetimes... error[E0310]: the parameter type `T` may not live long enough - --> $DIR/must_outlive_least_region_or_bound.rs:22:51 + --> $DIR/must_outlive_least_region_or_bound.rs:43:51 | LL | fn ty_param_wont_outlive_static(x: T) -> impl Debug + 'static { | -- ^^^^^^^^^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds | | | help: consider adding an explicit lifetime bound...: `T: 'static +` -error: aborting due to 5 previous errors +error: cannot infer an appropriate lifetime + --> $DIR/must_outlive_least_region_or_bound.rs:18:50 + | +LL | fn elided3(x: &i32) -> Box { Box::new(x) } + | ---- ---------^- + | | | | + | | | ...and is captured here + | | ...is required to be `'static` by this... + | data with this lifetime... + | +help: to permit non-static references in a `dyn Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 18:1 + | +LL | fn elided3(x: &i32) -> Box { Box::new(x) } + | ^^^^ + +error: cannot infer an appropriate lifetime + --> $DIR/must_outlive_least_region_or_bound.rs:21:59 + | +LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } + | ------- ---------^- + | | | | + | | | ...and is captured here + | | ...is required to be `'static` by this... + | data with this lifetime... + | +help: to permit non-static references in a `dyn Trait` value, you can add an explicit bound for the lifetime `'a` as defined on the function body at 21:14 + | +LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } + | ^^^^ + +error[E0621]: explicit lifetime required in the type of `x` + --> $DIR/must_outlive_least_region_or_bound.rs:24:51 + | +LL | fn elided4(x: &i32) -> Box { Box::new(x) } + | ---- ^^^^^^^^^^^ lifetime `'static` required + | | + | help: add explicit lifetime `'static` to the type of `x`: `&'static i32` + +error[E0495]: cannot infer an appropriate lifetime due to conflicting requirements + --> $DIR/must_outlive_least_region_or_bound.rs:27:69 + | +LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } + | ^ + | +note: first, the lifetime cannot outlive the lifetime `'a` as defined on the function body at 27:14... + --> $DIR/must_outlive_least_region_or_bound.rs:27:14 + | +LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } + | ^^ +note: ...so that the expression is assignable + --> $DIR/must_outlive_least_region_or_bound.rs:27:69 + | +LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } + | ^ + = note: expected `&i32` + found `&'a i32` + = note: but, the lifetime must be valid for the static lifetime... +note: ...so that the expression is assignable + --> $DIR/must_outlive_least_region_or_bound.rs:27:60 + | +LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } + | ^^^^^^^^^^^ + = note: expected `std::boxed::Box<(dyn std::fmt::Debug + 'static)>` + found `std::boxed::Box` + +error: aborting due to 12 previous errors -Some errors have detailed explanations: E0310, E0623. +Some errors have detailed explanations: E0310, E0495, E0621, E0623. For more information about an error, try `rustc --explain E0310`. From c91320f06b0b967b662f62a1c00447b9c87d4542 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Esteban=20K=C3=BCber?= Date: Fri, 29 May 2020 18:05:20 -0700 Subject: [PATCH 02/11] When `'static` is explicit, suggest constraining argument with it --- .../infer/error_reporting/mod.rs | 3 +- .../nice_region_error/static_impl_trait.rs | 115 +++++++++++------- src/librustc_middle/ty/diagnostics.rs | 5 +- .../must_outlive_least_region_or_bound.rs | 2 +- .../must_outlive_least_region_or_bound.stderr | 75 +++++++----- src/test/ui/issues/issue-16922.stderr | 2 +- ...ect-lifetime-default-from-box-error.stderr | 2 +- ...ion-object-lifetime-in-coercion.nll.stderr | 19 ++- .../region-object-lifetime-in-coercion.rs | 5 +- .../region-object-lifetime-in-coercion.stderr | 61 +++++++--- .../regions-close-object-into-object-2.stderr | 32 ++--- .../regions-close-object-into-object-4.stderr | 32 ++--- .../regions-proc-bound-capture.nll.stderr | 11 ++ .../ui/regions/regions-proc-bound-capture.rs | 4 +- .../regions/regions-proc-bound-capture.stderr | 25 ++-- .../dyn-trait-underscore.stderr | 2 +- 16 files changed, 237 insertions(+), 158 deletions(-) create mode 100644 src/test/ui/regions/regions-proc-bound-capture.nll.stderr diff --git a/src/librustc_infer/infer/error_reporting/mod.rs b/src/librustc_infer/infer/error_reporting/mod.rs index a59a91e3005a..f7969fe779d3 100644 --- a/src/librustc_infer/infer/error_reporting/mod.rs +++ b/src/librustc_infer/infer/error_reporting/mod.rs @@ -2037,8 +2037,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> { self.tcx.sess, var_origin.span(), E0495, - "cannot infer an appropriate lifetime{} \ - due to conflicting requirements", + "cannot infer an appropriate lifetime{} due to conflicting requirements", var_description ) } diff --git a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs index 88d6c23d5144..e24535bba5fd 100644 --- a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs +++ b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs @@ -10,6 +10,7 @@ use rustc_middle::ty::RegionKind; impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { /// Print the error message for lifetime errors when the return type is a static impl Trait. pub(super) fn try_report_static_impl_trait(&self) -> Option { + debug!("try_report_static_impl_trait(error={:?})", self.error); if let Some(ref error) = self.error { if let RegionResolutionError::SubSupConflict( _, @@ -18,19 +19,24 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { sub_r, sup_origin, sup_r, - ) = error.clone() + ) = error { + debug!( + "try_report_static_impl_trait(var={:?}, sub={:?} {:?} sup={:?} {:?})", + var_origin, sub_origin, sub_r, sup_origin, sup_r + ); let anon_reg_sup = self.tcx().is_suitable_region(sup_r)?; + debug!("try_report_static_impl_trait: anon_reg_sup={:?}", anon_reg_sup); let fn_return = self.tcx().return_type_impl_or_dyn_trait(anon_reg_sup.def_id)?; - let is_dyn = matches!(fn_return.kind, TyKind::TraitObject(..)); - let fn_return_span = fn_return.span; - if sub_r == &RegionKind::ReStatic { + debug!("try_report_static_impl_trait: fn_return={:?}", fn_return); + if **sub_r == RegionKind::ReStatic { let sp = var_origin.span(); let return_sp = sub_origin.span(); + let param_info = self.find_param_with_region(sup_r, sub_r)?; let mut err = self.tcx().sess.struct_span_err(sp, "cannot infer an appropriate lifetime"); - let param_info = self.find_param_with_region(sup_r, sub_r)?; err.span_label(param_info.param_ty_span, "data with this lifetime..."); + debug!("try_report_static_impl_trait: param_info={:?}", param_info); // We try to make the output have fewer overlapping spans if possible. if (sp == sup_origin.span() || !return_sp.overlaps(sup_origin.span())) @@ -60,14 +66,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { if sup_r.has_name() { sup_r.to_string() } else { "'_".to_owned() }; // only apply this suggestion onto functions with // explicit non-desugar'able return. - if fn_return_span.desugaring_kind().is_none() { - let msg = format!( - "to permit non-static references in {} `{} Trait` value, you can add \ - an explicit bound for {}", - if is_dyn { "a" } else { "an" }, - if is_dyn { "dyn" } else { "impl" }, - lifetime, - ); + if fn_return.span.desugaring_kind().is_none() { // FIXME: account for the need of parens in `&(dyn Trait + '_)` match fn_return.kind { TyKind::Def(item_id, _) => { @@ -78,7 +77,8 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { err.emit(); return Some(ErrorReported); }; - let (span, sugg) = opaque + + if let Some(span) = opaque .bounds .iter() .filter_map(|arg| match arg { @@ -86,38 +86,71 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { name: LifetimeName::Static, span, .. - }) => Some((*span, lifetime_name.clone())), + }) => Some(*span), _ => None, }) .next() - .unwrap_or_else(|| { - ( - fn_return_span.shrink_to_hi(), - format!(" + {}", lifetime_name), - ) - }); - - err.span_suggestion_verbose( - span, - &msg, - sugg, - Applicability::MaybeIncorrect, - ); - } - TyKind::TraitObject(_, lt) => { - let (span, sugg) = match lt.name { - LifetimeName::ImplicitObjectLifetimeDefault => ( - fn_return_span.shrink_to_hi(), + { + err.span_suggestion_verbose( + span, + "consider changing the `impl Trait`'s explicit \ + `'static` bound", + lifetime_name, + Applicability::MaybeIncorrect, + ); + err.span_suggestion_verbose( + param_info.param_ty_span, + "alternatively, set an explicit `'static` lifetime to \ + this parameter", + param_info.param_ty.to_string(), + Applicability::MaybeIncorrect, + ); + } else { + err.span_suggestion_verbose( + fn_return.span.shrink_to_hi(), + &format!( + "to permit non-static references in an `impl Trait` \ + value, you can add an explicit bound for {}", + lifetime, + ), format!(" + {}", lifetime_name), - ), - _ => (lt.span, lifetime_name), + Applicability::MaybeIncorrect, + ); }; - err.span_suggestion_verbose( - span, - &msg, - sugg, - Applicability::MaybeIncorrect, - ); + } + TyKind::TraitObject(_, lt) => { + match lt.name { + LifetimeName::ImplicitObjectLifetimeDefault => { + err.span_suggestion_verbose( + fn_return.span.shrink_to_hi(), + &format!( + "to permit non-static references in a trait object \ + value, you can add an explicit bound for {}", + lifetime, + ), + format!(" + {}", lifetime_name), + Applicability::MaybeIncorrect, + ); + } + _ => { + err.span_suggestion_verbose( + lt.span, + "consider changing the trait object's explicit \ + `'static` bound", + lifetime_name, + Applicability::MaybeIncorrect, + ); + err.span_suggestion_verbose( + param_info.param_ty_span, + &format!( + "alternatively, set an explicit `'static` lifetime \ + in this parameter", + ), + param_info.param_ty.to_string(), + Applicability::MaybeIncorrect, + ); + } + } } _ => {} } diff --git a/src/librustc_middle/ty/diagnostics.rs b/src/librustc_middle/ty/diagnostics.rs index 3ca506fe0d59..a2812e117ed3 100644 --- a/src/librustc_middle/ty/diagnostics.rs +++ b/src/librustc_middle/ty/diagnostics.rs @@ -247,7 +247,10 @@ impl<'v> hir::intravisit::Visitor<'v> for TraitObjectVisitor<'v> { fn visit_ty(&mut self, ty: &'v hir::Ty<'v>) { if let hir::TyKind::TraitObject( _, - hir::Lifetime { name: hir::LifetimeName::ImplicitObjectLifetimeDefault, .. }, + hir::Lifetime { + name: hir::LifetimeName::ImplicitObjectLifetimeDefault | hir::LifetimeName::Static, + .. + }, ) = ty.kind { self.0.push(ty); diff --git a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.rs b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.rs index beafe9258209..837244b02272 100644 --- a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.rs +++ b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.rs @@ -22,7 +22,7 @@ fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } //~^ ERROR cannot infer an appropriate lifetime fn elided4(x: &i32) -> Box { Box::new(x) } -//~^ ERROR explicit lifetime required in the type of `x` +//~^ ERROR cannot infer an appropriate lifetime fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } //~^ ERROR cannot infer an appropriate lifetime diff --git a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr index 525e271bea9c..96d4a121c16a 100644 --- a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr +++ b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr @@ -35,10 +35,14 @@ LL | fn elided2(x: &i32) -> impl Copy + 'static { x } | | ...is required to be `'static` by this... | data with this lifetime... | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 9:1 +help: consider changing the `impl Trait`'s explicit `'static` bound | LL | fn elided2(x: &i32) -> impl Copy + '_ { x } | ^^ +help: alternatively, set an explicit `'static` lifetime to this parameter + | +LL | fn elided2(x: &'static i32) -> impl Copy + 'static { x } + | ^^^^^^^^^^^^ error: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:12:55 @@ -49,10 +53,14 @@ LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x } | | ...is required to be `'static` by this... | data with this lifetime... | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the lifetime `'a` as defined on the function body at 12:14 +help: consider changing the `impl Trait`'s explicit `'static` bound | LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'a { x } | ^^ +help: alternatively, set an explicit `'static` lifetime to this parameter + | +LL | fn explicit2<'a>(x: &'static i32) -> impl Copy + 'static { x } + | ^^^^^^^^^^^^ error[E0621]: explicit lifetime required in the type of `x` --> $DIR/must_outlive_least_region_or_bound.rs:15:24 @@ -71,10 +79,14 @@ LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x } | | ...is required to be `'static` by this... | data with this lifetime... | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the lifetime `'a` as defined on the function body at 33:15 +help: consider changing the `impl Trait`'s explicit `'static` bound | LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'a { x } | ^^ +help: alternatively, set an explicit `'static` lifetime to this parameter + | +LL | fn with_bound<'a>(x: &'static i32) -> impl LifetimeTrait<'a> + 'static { x } + | ^^^^^^^^^^^^ error[E0623]: lifetime mismatch --> $DIR/must_outlive_least_region_or_bound.rs:38:61 @@ -103,7 +115,7 @@ LL | fn elided3(x: &i32) -> Box { Box::new(x) } | | ...is required to be `'static` by this... | data with this lifetime... | -help: to permit non-static references in a `dyn Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 18:1 +help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 18:1 | LL | fn elided3(x: &i32) -> Box { Box::new(x) } | ^^^^ @@ -118,47 +130,48 @@ LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } | | ...is required to be `'static` by this... | data with this lifetime... | -help: to permit non-static references in a `dyn Trait` value, you can add an explicit bound for the lifetime `'a` as defined on the function body at 21:14 +help: to permit non-static references in a trait object value, you can add an explicit bound for the lifetime `'a` as defined on the function body at 21:14 | LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } | ^^^^ -error[E0621]: explicit lifetime required in the type of `x` - --> $DIR/must_outlive_least_region_or_bound.rs:24:51 +error: cannot infer an appropriate lifetime + --> $DIR/must_outlive_least_region_or_bound.rs:24:60 | LL | fn elided4(x: &i32) -> Box { Box::new(x) } - | ---- ^^^^^^^^^^^ lifetime `'static` required - | | - | help: add explicit lifetime `'static` to the type of `x`: `&'static i32` - -error[E0495]: cannot infer an appropriate lifetime due to conflicting requirements - --> $DIR/must_outlive_least_region_or_bound.rs:27:69 + | ---- ---------^- + | | | | + | | | ...and is captured here + | data with this lifetime... ...is required to be `'static` by this... | -LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } - | ^ +help: consider changing the trait object's explicit `'static` bound | -note: first, the lifetime cannot outlive the lifetime `'a` as defined on the function body at 27:14... - --> $DIR/must_outlive_least_region_or_bound.rs:27:14 +LL | fn elided4(x: &i32) -> Box { Box::new(x) } + | ^^ +help: alternatively, set an explicit `'static` lifetime in this parameter | -LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } - | ^^ -note: ...so that the expression is assignable +LL | fn elided4(x: &'static i32) -> Box { Box::new(x) } + | ^^^^^^^^^^^^ + +error: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:27:69 | LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } - | ^ - = note: expected `&i32` - found `&'a i32` - = note: but, the lifetime must be valid for the static lifetime... -note: ...so that the expression is assignable - --> $DIR/must_outlive_least_region_or_bound.rs:27:60 + | ------- ---------^- + | | | | + | | | ...and is captured here + | data with this lifetime... ...is required to be `'static` by this... | -LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } - | ^^^^^^^^^^^ - = note: expected `std::boxed::Box<(dyn std::fmt::Debug + 'static)>` - found `std::boxed::Box` +help: consider changing the trait object's explicit `'static` bound + | +LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } + | ^^ +help: alternatively, set an explicit `'static` lifetime in this parameter + | +LL | fn explicit4<'a>(x: &'static i32) -> Box { Box::new(x) } + | ^^^^^^^^^^^^ error: aborting due to 12 previous errors -Some errors have detailed explanations: E0310, E0495, E0621, E0623. +Some errors have detailed explanations: E0310, E0621, E0623. For more information about an error, try `rustc --explain E0310`. diff --git a/src/test/ui/issues/issue-16922.stderr b/src/test/ui/issues/issue-16922.stderr index 02d33aae023f..038df47e1bd9 100644 --- a/src/test/ui/issues/issue-16922.stderr +++ b/src/test/ui/issues/issue-16922.stderr @@ -9,7 +9,7 @@ LL | Box::new(value) as Box | | ...and is captured here | ...is required to be `'static` by this... | -help: to permit non-static references in a `dyn Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 3:1 +help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 3:1 | LL | fn foo(value: &T) -> Box { | ^^^^ diff --git a/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr b/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr index 70a9bf22b8db..555622c9d13c 100644 --- a/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr +++ b/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr @@ -7,7 +7,7 @@ LL | fn load(ss: &mut SomeStruct) -> Box { LL | ss.r | ^^^^ ...is captured and required to be `'static` here | -help: to permit non-static references in a `dyn Trait` value, you can add an explicit bound for the anonymous lifetime #2 defined on the function body at 14:1 +help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime #2 defined on the function body at 14:1 | LL | fn load(ss: &mut SomeStruct) -> Box { | ^^^^ diff --git a/src/test/ui/regions/region-object-lifetime-in-coercion.nll.stderr b/src/test/ui/regions/region-object-lifetime-in-coercion.nll.stderr index bf02ba8eb919..7e8f78067e08 100644 --- a/src/test/ui/regions/region-object-lifetime-in-coercion.nll.stderr +++ b/src/test/ui/regions/region-object-lifetime-in-coercion.nll.stderr @@ -1,21 +1,21 @@ -error[E0621]: explicit lifetime required in the type of `v` +error: lifetime may not live long enough --> $DIR/region-object-lifetime-in-coercion.rs:8:12 | LL | fn a(v: &[u8]) -> Box { - | ----- help: add explicit lifetime `'static` to the type of `v`: `&'static [u8]` + | - let's call the lifetime of this reference `'1` LL | let x: Box = Box::new(v); - | ^^^^^^^^^^^^^^^^^^^^^^ lifetime `'static` required + | ^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'1` must outlive `'static` -error[E0621]: explicit lifetime required in the type of `v` - --> $DIR/region-object-lifetime-in-coercion.rs:14:5 +error: lifetime may not live long enough + --> $DIR/region-object-lifetime-in-coercion.rs:13:5 | LL | fn b(v: &[u8]) -> Box { - | ----- help: add explicit lifetime `'static` to the type of `v`: `&'static [u8]` + | - let's call the lifetime of this reference `'1` LL | Box::new(v) - | ^^^^^^^^^^^ lifetime `'static` required + | ^^^^^^^^^^^ returning this value requires that `'1` must outlive `'static` error: lifetime may not live long enough - --> $DIR/region-object-lifetime-in-coercion.rs:20:5 + --> $DIR/region-object-lifetime-in-coercion.rs:19:5 | LL | fn c(v: &[u8]) -> Box { | - let's call the lifetime of this reference `'1` @@ -24,7 +24,7 @@ LL | Box::new(v) | ^^^^^^^^^^^ returning this value requires that `'1` must outlive `'static` error: lifetime may not live long enough - --> $DIR/region-object-lifetime-in-coercion.rs:24:5 + --> $DIR/region-object-lifetime-in-coercion.rs:23:5 | LL | fn d<'a,'b>(v: &'a [u8]) -> Box { | -- -- lifetime `'b` defined here @@ -37,4 +37,3 @@ LL | Box::new(v) error: aborting due to 4 previous errors -For more information about this error, try `rustc --explain E0621`. diff --git a/src/test/ui/regions/region-object-lifetime-in-coercion.rs b/src/test/ui/regions/region-object-lifetime-in-coercion.rs index d56eaf77b664..5d199149c39b 100644 --- a/src/test/ui/regions/region-object-lifetime-in-coercion.rs +++ b/src/test/ui/regions/region-object-lifetime-in-coercion.rs @@ -5,13 +5,12 @@ trait Foo {} impl<'a> Foo for &'a [u8] {} fn a(v: &[u8]) -> Box { - let x: Box = Box::new(v); - //~^ ERROR explicit lifetime required in the type of `v` [E0621] + let x: Box = Box::new(v); //~ ERROR cannot infer an appropriate lifetime x } fn b(v: &[u8]) -> Box { - Box::new(v) //~ ERROR explicit lifetime required in the type of `v` [E0621] + Box::new(v) //~ ERROR cannot infer an appropriate lifetime } fn c(v: &[u8]) -> Box { diff --git a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr index 1462af44cb15..673300cebc26 100644 --- a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr +++ b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr @@ -1,21 +1,45 @@ -error[E0621]: explicit lifetime required in the type of `v` - --> $DIR/region-object-lifetime-in-coercion.rs:8:37 +error: cannot infer an appropriate lifetime + --> $DIR/region-object-lifetime-in-coercion.rs:8:46 | LL | fn a(v: &[u8]) -> Box { - | ----- help: add explicit lifetime `'static` to the type of `v`: `&'static [u8]` + | ----- data with this lifetime... LL | let x: Box = Box::new(v); - | ^^^^^^^^^^^ lifetime `'static` required + | ---------^- + | | | + | | ...and is captured here + | ...is required to be `'static` by this... + | +help: consider changing the trait object's explicit `'static` bound + | +LL | fn a(v: &[u8]) -> Box { + | ^^ +help: alternatively, set an explicit `'static` lifetime in this parameter + | +LL | fn a(v: &'static [u8]) -> Box { + | ^^^^^^^^^^^^^ -error[E0621]: explicit lifetime required in the type of `v` - --> $DIR/region-object-lifetime-in-coercion.rs:14:5 +error: cannot infer an appropriate lifetime + --> $DIR/region-object-lifetime-in-coercion.rs:13:14 | LL | fn b(v: &[u8]) -> Box { - | ----- help: add explicit lifetime `'static` to the type of `v`: `&'static [u8]` + | ----- data with this lifetime... LL | Box::new(v) - | ^^^^^^^^^^^ lifetime `'static` required + | ---------^- + | | | + | | ...and is captured here + | ...is required to be `'static` by this... + | +help: consider changing the trait object's explicit `'static` bound + | +LL | fn b(v: &[u8]) -> Box { + | ^^ +help: alternatively, set an explicit `'static` lifetime in this parameter + | +LL | fn b(v: &'static [u8]) -> Box { + | ^^^^^^^^^^^^^ error: cannot infer an appropriate lifetime - --> $DIR/region-object-lifetime-in-coercion.rs:20:14 + --> $DIR/region-object-lifetime-in-coercion.rs:19:14 | LL | fn c(v: &[u8]) -> Box { | ----- data with this lifetime... @@ -26,36 +50,36 @@ LL | Box::new(v) | | ...and is captured here | ...is required to be `'static` by this... | -help: to permit non-static references in a `dyn Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 17:1 +help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 16:1 | LL | fn c(v: &[u8]) -> Box { | ^^^^ error[E0495]: cannot infer an appropriate lifetime due to conflicting requirements - --> $DIR/region-object-lifetime-in-coercion.rs:24:14 + --> $DIR/region-object-lifetime-in-coercion.rs:23:14 | LL | Box::new(v) | ^ | -note: first, the lifetime cannot outlive the lifetime `'a` as defined on the function body at 23:6... - --> $DIR/region-object-lifetime-in-coercion.rs:23:6 +note: first, the lifetime cannot outlive the lifetime `'a` as defined on the function body at 22:6... + --> $DIR/region-object-lifetime-in-coercion.rs:22:6 | LL | fn d<'a,'b>(v: &'a [u8]) -> Box { | ^^ note: ...so that the expression is assignable - --> $DIR/region-object-lifetime-in-coercion.rs:24:14 + --> $DIR/region-object-lifetime-in-coercion.rs:23:14 | LL | Box::new(v) | ^ = note: expected `&[u8]` found `&'a [u8]` -note: but, the lifetime must be valid for the lifetime `'b` as defined on the function body at 23:9... - --> $DIR/region-object-lifetime-in-coercion.rs:23:9 +note: but, the lifetime must be valid for the lifetime `'b` as defined on the function body at 22:9... + --> $DIR/region-object-lifetime-in-coercion.rs:22:9 | LL | fn d<'a,'b>(v: &'a [u8]) -> Box { | ^^ note: ...so that the expression is assignable - --> $DIR/region-object-lifetime-in-coercion.rs:24:5 + --> $DIR/region-object-lifetime-in-coercion.rs:23:5 | LL | Box::new(v) | ^^^^^^^^^^^ @@ -64,5 +88,4 @@ LL | Box::new(v) error: aborting due to 4 previous errors -Some errors have detailed explanations: E0495, E0621. -For more information about an error, try `rustc --explain E0495`. +For more information about this error, try `rustc --explain E0495`. diff --git a/src/test/ui/regions/regions-close-object-into-object-2.stderr b/src/test/ui/regions/regions-close-object-into-object-2.stderr index 147f7f354181..982ed07232a8 100644 --- a/src/test/ui/regions/regions-close-object-into-object-2.stderr +++ b/src/test/ui/regions/regions-close-object-into-object-2.stderr @@ -1,28 +1,22 @@ -error[E0495]: cannot infer an appropriate lifetime for borrow expression due to conflicting requirements +error: cannot infer an appropriate lifetime --> $DIR/regions-close-object-into-object-2.rs:10:11 | +LL | fn g<'a, T: 'static>(v: Box + 'a>) -> Box { + | ------------------ data with this lifetime... LL | box B(&*v) as Box - | ^^^ - | -note: first, the lifetime cannot outlive the lifetime `'a` as defined on the function body at 9:6... - --> $DIR/regions-close-object-into-object-2.rs:9:6 + | ------^^^--------------- + | | | + | | ...and is captured here + | ...is required to be `'static` by this... | -LL | fn g<'a, T: 'static>(v: Box + 'a>) -> Box { - | ^^ -note: ...so that the type `(dyn A + 'a)` is not borrowed for too long - --> $DIR/regions-close-object-into-object-2.rs:10:11 +help: consider changing the trait object's explicit `'static` bound | -LL | box B(&*v) as Box - | ^^^ - = note: but, the lifetime must be valid for the static lifetime... -note: ...so that the expression is assignable - --> $DIR/regions-close-object-into-object-2.rs:10:5 +LL | fn g<'a, T: 'static>(v: Box + 'a>) -> Box { + | ^^ +help: alternatively, set an explicit `'static` lifetime in this parameter | -LL | box B(&*v) as Box - | ^^^^^^^^^^^^^^^^^^^^^^^^ - = note: expected `std::boxed::Box<(dyn X + 'static)>` - found `std::boxed::Box` +LL | fn g<'a, T: 'static>(v: std::boxed::Box<(dyn A + 'static)>) -> Box { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: aborting due to previous error -For more information about this error, try `rustc --explain E0495`. diff --git a/src/test/ui/regions/regions-close-object-into-object-4.stderr b/src/test/ui/regions/regions-close-object-into-object-4.stderr index 6e7d6152cd09..1b82098ee13c 100644 --- a/src/test/ui/regions/regions-close-object-into-object-4.stderr +++ b/src/test/ui/regions/regions-close-object-into-object-4.stderr @@ -1,28 +1,22 @@ -error[E0495]: cannot infer an appropriate lifetime for borrow expression due to conflicting requirements +error: cannot infer an appropriate lifetime --> $DIR/regions-close-object-into-object-4.rs:10:11 | +LL | fn i<'a, T, U>(v: Box+'a>) -> Box { + | ---------------- data with this lifetime... LL | box B(&*v) as Box - | ^^^ - | -note: first, the lifetime cannot outlive the lifetime `'a` as defined on the function body at 9:6... - --> $DIR/regions-close-object-into-object-4.rs:9:6 + | ------^^^--------------- + | | | + | | ...and is captured here + | ...is required to be `'static` by this... | -LL | fn i<'a, T, U>(v: Box+'a>) -> Box { - | ^^ -note: ...so that the type `(dyn A + 'a)` is not borrowed for too long - --> $DIR/regions-close-object-into-object-4.rs:10:11 +help: consider changing the trait object's explicit `'static` bound | -LL | box B(&*v) as Box - | ^^^ - = note: but, the lifetime must be valid for the static lifetime... -note: ...so that the expression is assignable - --> $DIR/regions-close-object-into-object-4.rs:10:5 +LL | fn i<'a, T, U>(v: Box+'a>) -> Box { + | ^^ +help: alternatively, set an explicit `'static` lifetime in this parameter | -LL | box B(&*v) as Box - | ^^^^^^^^^^^^^^^^^^^^^^^^ - = note: expected `std::boxed::Box<(dyn X + 'static)>` - found `std::boxed::Box` +LL | fn i<'a, T, U>(v: std::boxed::Box<(dyn A + 'static)>) -> Box { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: aborting due to previous error -For more information about this error, try `rustc --explain E0495`. diff --git a/src/test/ui/regions/regions-proc-bound-capture.nll.stderr b/src/test/ui/regions/regions-proc-bound-capture.nll.stderr new file mode 100644 index 000000000000..75890b858153 --- /dev/null +++ b/src/test/ui/regions/regions-proc-bound-capture.nll.stderr @@ -0,0 +1,11 @@ +error: lifetime may not live long enough + --> $DIR/regions-proc-bound-capture.rs:9:5 + | +LL | fn static_proc(x: &isize) -> Box (isize) + 'static> { + | - let's call the lifetime of this reference `'1` +LL | // This is illegal, because the region bound on `proc` is 'static. +LL | Box::new(move || { *x }) + | ^^^^^^^^^^^^^^^^^^^^^^^^ returning this value requires that `'1` must outlive `'static` + +error: aborting due to previous error + diff --git a/src/test/ui/regions/regions-proc-bound-capture.rs b/src/test/ui/regions/regions-proc-bound-capture.rs index 0c903b738499..8617c0e9da8f 100644 --- a/src/test/ui/regions/regions-proc-bound-capture.rs +++ b/src/test/ui/regions/regions-proc-bound-capture.rs @@ -4,9 +4,9 @@ fn borrowed_proc<'a>(x: &'a isize) -> Box(isize) + 'a> { Box::new(move|| { *x }) } -fn static_proc(x: &isize) -> Box(isize) + 'static> { +fn static_proc(x: &isize) -> Box (isize) + 'static> { // This is illegal, because the region bound on `proc` is 'static. - Box::new(move|| { *x }) //~ ERROR explicit lifetime required in the type of `x` [E0621] + Box::new(move || { *x }) //~ ERROR cannot infer an appropriate lifetime } fn main() { } diff --git a/src/test/ui/regions/regions-proc-bound-capture.stderr b/src/test/ui/regions/regions-proc-bound-capture.stderr index c53af34456ef..e7bbfaababe8 100644 --- a/src/test/ui/regions/regions-proc-bound-capture.stderr +++ b/src/test/ui/regions/regions-proc-bound-capture.stderr @@ -1,12 +1,23 @@ -error[E0621]: explicit lifetime required in the type of `x` - --> $DIR/regions-proc-bound-capture.rs:9:5 +error: cannot infer an appropriate lifetime + --> $DIR/regions-proc-bound-capture.rs:9:14 | -LL | fn static_proc(x: &isize) -> Box(isize) + 'static> { - | ------ help: add explicit lifetime `'static` to the type of `x`: `&'static isize` +LL | fn static_proc(x: &isize) -> Box (isize) + 'static> { + | ------ data with this lifetime... LL | // This is illegal, because the region bound on `proc` is 'static. -LL | Box::new(move|| { *x }) - | ^^^^^^^^^^^^^^^^^^^^^^^ lifetime `'static` required +LL | Box::new(move || { *x }) + | ---------^^^^^^^^^^^^^^- + | | | + | | ...and is captured here + | ...is required to be `'static` by this... + | +help: consider changing the trait object's explicit `'static` bound + | +LL | fn static_proc(x: &isize) -> Box (isize) + '_> { + | ^^ +help: alternatively, set an explicit `'static` lifetime in this parameter + | +LL | fn static_proc(x: &'static isize) -> Box (isize) + 'static> { + | ^^^^^^^^^^^^^^ error: aborting due to previous error -For more information about this error, try `rustc --explain E0621`. diff --git a/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr b/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr index 3577dd59289e..4dc4aac6ceac 100644 --- a/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr +++ b/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr @@ -7,7 +7,7 @@ LL | // ^^^^^^^^^^^^^^^^^^^^^ bound *here* defaults to LL | Box::new(items.iter()) | ---------------^^^^--- ...is captured and required to be `'static` here | -help: to permit non-static references in a `dyn Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 6:1 +help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 6:1 | LL | fn a(items: &[T]) -> Box + '_> { | ^^^^ From abf74b9e729463a18f5da1d79cecaf9f4fc07d17 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Esteban=20K=C3=BCber?= Date: Fri, 29 May 2020 18:59:42 -0700 Subject: [PATCH 03/11] Reduce verbosity of suggestion message and mention lifetime in label --- .../nice_region_error/static_impl_trait.rs | 87 ++++++++++--------- .../ui/async-await/issues/issue-62097.stderr | 2 +- .../must_outlive_least_region_or_bound.stderr | 38 ++++---- .../static-return-lifetime-infered.stderr | 8 +- src/test/ui/issues/issue-16922.stderr | 4 +- ...ect-lifetime-default-from-box-error.stderr | 4 +- .../region-object-lifetime-in-coercion.stderr | 12 +-- .../regions-close-object-into-object-2.stderr | 4 +- .../regions-close-object-into-object-4.stderr | 4 +- .../regions/regions-proc-bound-capture.stderr | 4 +- ...types_pin_lifetime_impl_trait-async.stderr | 2 +- ..._self_types_pin_lifetime_impl_trait.stderr | 4 +- .../missing-lifetimes-in-signature.stderr | 4 +- .../dyn-trait-underscore.stderr | 4 +- 14 files changed, 95 insertions(+), 86 deletions(-) diff --git a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs index e24535bba5fd..e9f165d309f8 100644 --- a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs +++ b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs @@ -1,6 +1,5 @@ //! Error Reporting for static impl Traits. -use crate::infer::error_reporting::msg_span_from_free_region; use crate::infer::error_reporting::nice_region_error::NiceRegionError; use crate::infer::lexical_region_resolve::RegionResolutionError; use rustc_errors::{Applicability, ErrorReported}; @@ -33,9 +32,17 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { let sp = var_origin.span(); let return_sp = sub_origin.span(); let param_info = self.find_param_with_region(sup_r, sub_r)?; + let (lifetime_name, lifetime) = if sup_r.has_name() { + (sup_r.to_string(), format!("lifetime `{}`", sup_r)) + } else { + ("'_".to_owned(), "the anonymous lifetime `'_`".to_string()) + }; let mut err = self.tcx().sess.struct_span_err(sp, "cannot infer an appropriate lifetime"); - err.span_label(param_info.param_ty_span, "data with this lifetime..."); + err.span_label( + param_info.param_ty_span, + &format!("this data with {}...", lifetime), + ); debug!("try_report_static_impl_trait: param_info={:?}", param_info); // We try to make the output have fewer overlapping spans if possible. @@ -60,10 +67,6 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { ); } - let (lifetime, _) = msg_span_from_free_region(self.tcx(), sup_r); - - let lifetime_name = - if sup_r.has_name() { sup_r.to_string() } else { "'_".to_owned() }; // only apply this suggestion onto functions with // explicit non-desugar'able return. if fn_return.span.desugaring_kind().is_none() { @@ -93,8 +96,11 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { { err.span_suggestion_verbose( span, - "consider changing the `impl Trait`'s explicit \ - `'static` bound", + &format!( + "consider changing the `impl Trait`'s explicit \ + `'static` bound to {}", + lifetime, + ), lifetime_name, Applicability::MaybeIncorrect, ); @@ -118,40 +124,41 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { ); }; } - TyKind::TraitObject(_, lt) => { - match lt.name { - LifetimeName::ImplicitObjectLifetimeDefault => { - err.span_suggestion_verbose( - fn_return.span.shrink_to_hi(), - &format!( - "to permit non-static references in a trait object \ - value, you can add an explicit bound for {}", - lifetime, - ), - format!(" + {}", lifetime_name), - Applicability::MaybeIncorrect, - ); - } - _ => { - err.span_suggestion_verbose( - lt.span, + TyKind::TraitObject(_, lt) => match lt.name { + LifetimeName::ImplicitObjectLifetimeDefault => { + err.span_suggestion_verbose( + fn_return.span.shrink_to_hi(), + &format!( + "to permit non-static references in a trait object \ + value, you can add an explicit bound for {}", + lifetime, + ), + format!(" + {}", lifetime_name), + Applicability::MaybeIncorrect, + ); + } + _ => { + err.span_suggestion_verbose( + lt.span, + &format!( "consider changing the trait object's explicit \ - `'static` bound", - lifetime_name, - Applicability::MaybeIncorrect, - ); - err.span_suggestion_verbose( - param_info.param_ty_span, - &format!( - "alternatively, set an explicit `'static` lifetime \ - in this parameter", - ), - param_info.param_ty.to_string(), - Applicability::MaybeIncorrect, - ); - } + `'static` bound to {}", + lifetime, + ), + lifetime_name, + Applicability::MaybeIncorrect, + ); + err.span_suggestion_verbose( + param_info.param_ty_span, + &format!( + "alternatively, set an explicit `'static` lifetime \ + in this parameter", + ), + param_info.param_ty.to_string(), + Applicability::MaybeIncorrect, + ); } - } + }, _ => {} } } diff --git a/src/test/ui/async-await/issues/issue-62097.stderr b/src/test/ui/async-await/issues/issue-62097.stderr index af8fc2cd2ab4..fff43ae9f47b 100644 --- a/src/test/ui/async-await/issues/issue-62097.stderr +++ b/src/test/ui/async-await/issues/issue-62097.stderr @@ -4,7 +4,7 @@ error: cannot infer an appropriate lifetime LL | pub async fn run_dummy_fn(&self) { | ^^^^^ | | - | data with this lifetime... + | this data with the anonymous lifetime `'_`... | ...is captured here... LL | foo(|| self.bar()).await; | --- ...and required to be `'static` by this diff --git a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr index 96d4a121c16a..00b6ec38323c 100644 --- a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr +++ b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr @@ -5,9 +5,9 @@ LL | fn elided(x: &i32) -> impl Copy { x } | ---- --------- ^ ...and is captured here | | | | | ...is required to be `'static` by this... - | data with this lifetime... + | this data with the anonymous lifetime `'_`... | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 3:1 +help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime `'_` | LL | fn elided(x: &i32) -> impl Copy + '_ { x } | ^^^^ @@ -19,9 +19,9 @@ LL | fn explicit<'a>(x: &'a i32) -> impl Copy { x } | ------- --------- ^ ...and is captured here | | | | | ...is required to be `'static` by this... - | data with this lifetime... + | this data with lifetime `'a`... | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the lifetime `'a` as defined on the function body at 6:13 +help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for lifetime `'a` | LL | fn explicit<'a>(x: &'a i32) -> impl Copy + 'a { x } | ^^^^ @@ -33,9 +33,9 @@ LL | fn elided2(x: &i32) -> impl Copy + 'static { x } | ---- ------------------- ^ ...and is captured here | | | | | ...is required to be `'static` by this... - | data with this lifetime... + | this data with the anonymous lifetime `'_`... | -help: consider changing the `impl Trait`'s explicit `'static` bound +help: consider changing the `impl Trait`'s explicit `'static` bound to the anonymous lifetime `'_` | LL | fn elided2(x: &i32) -> impl Copy + '_ { x } | ^^ @@ -51,9 +51,9 @@ LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x } | ------- ------------------- ^ ...and is captured here | | | | | ...is required to be `'static` by this... - | data with this lifetime... + | this data with lifetime `'a`... | -help: consider changing the `impl Trait`'s explicit `'static` bound +help: consider changing the `impl Trait`'s explicit `'static` bound to lifetime `'a` | LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'a { x } | ^^ @@ -77,9 +77,9 @@ LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x } | ------- -------------------------------- ^ ...and is captured here | | | | | ...is required to be `'static` by this... - | data with this lifetime... + | this data with lifetime `'a`... | -help: consider changing the `impl Trait`'s explicit `'static` bound +help: consider changing the `impl Trait`'s explicit `'static` bound to lifetime `'a` | LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'a { x } | ^^ @@ -113,9 +113,9 @@ LL | fn elided3(x: &i32) -> Box { Box::new(x) } | | | | | | | ...and is captured here | | ...is required to be `'static` by this... - | data with this lifetime... + | this data with the anonymous lifetime `'_`... | -help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 18:1 +help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_` | LL | fn elided3(x: &i32) -> Box { Box::new(x) } | ^^^^ @@ -128,9 +128,9 @@ LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } | | | | | | | ...and is captured here | | ...is required to be `'static` by this... - | data with this lifetime... + | this data with lifetime `'a`... | -help: to permit non-static references in a trait object value, you can add an explicit bound for the lifetime `'a` as defined on the function body at 21:14 +help: to permit non-static references in a trait object value, you can add an explicit bound for lifetime `'a` | LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } | ^^^^ @@ -142,9 +142,10 @@ LL | fn elided4(x: &i32) -> Box { Box::new(x) } | ---- ---------^- | | | | | | | ...and is captured here - | data with this lifetime... ...is required to be `'static` by this... + | | ...is required to be `'static` by this... + | this data with the anonymous lifetime `'_`... | -help: consider changing the trait object's explicit `'static` bound +help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_` | LL | fn elided4(x: &i32) -> Box { Box::new(x) } | ^^ @@ -160,9 +161,10 @@ LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } | ------- ---------^- | | | | | | | ...and is captured here - | data with this lifetime... ...is required to be `'static` by this... + | | ...is required to be `'static` by this... + | this data with lifetime `'a`... | -help: consider changing the trait object's explicit `'static` bound +help: consider changing the trait object's explicit `'static` bound to lifetime `'a` | LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } | ^^ diff --git a/src/test/ui/impl-trait/static-return-lifetime-infered.stderr b/src/test/ui/impl-trait/static-return-lifetime-infered.stderr index 1c3a5979ee55..67d4f60dff6f 100644 --- a/src/test/ui/impl-trait/static-return-lifetime-infered.stderr +++ b/src/test/ui/impl-trait/static-return-lifetime-infered.stderr @@ -4,13 +4,13 @@ error: cannot infer an appropriate lifetime LL | fn iter_values_anon(&self) -> impl Iterator { | ----- ----------------------- ...is required to be `'static` by this... | | - | data with this lifetime... + | this data with the anonymous lifetime `'_`... LL | self.x.iter().map(|a| a.0) | ------ ^^^^ | | | ...and is captured here | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the method body at 6:5 +help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime `'_` | LL | fn iter_values_anon(&self) -> impl Iterator + '_ { | ^^^^ @@ -21,13 +21,13 @@ error: cannot infer an appropriate lifetime LL | fn iter_values<'a>(&'a self) -> impl Iterator { | -------- ----------------------- ...is required to be `'static` by this... | | - | data with this lifetime... + | this data with lifetime `'a`... LL | self.x.iter().map(|a| a.0) | ------ ^^^^ | | | ...and is captured here | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the lifetime `'a` as defined on the method body at 10:20 +help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for lifetime `'a` | LL | fn iter_values<'a>(&'a self) -> impl Iterator + 'a { | ^^^^ diff --git a/src/test/ui/issues/issue-16922.stderr b/src/test/ui/issues/issue-16922.stderr index 038df47e1bd9..c533a72dfc01 100644 --- a/src/test/ui/issues/issue-16922.stderr +++ b/src/test/ui/issues/issue-16922.stderr @@ -2,14 +2,14 @@ error: cannot infer an appropriate lifetime --> $DIR/issue-16922.rs:4:14 | LL | fn foo(value: &T) -> Box { - | -- data with this lifetime... + | -- this data with the anonymous lifetime `'_`... LL | Box::new(value) as Box | ---------^^^^^- | | | | | ...and is captured here | ...is required to be `'static` by this... | -help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 3:1 +help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_` | LL | fn foo(value: &T) -> Box { | ^^^^ diff --git a/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr b/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr index 555622c9d13c..6edef8086b93 100644 --- a/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr +++ b/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr @@ -2,12 +2,12 @@ error: cannot infer an appropriate lifetime --> $DIR/object-lifetime-default-from-box-error.rs:18:5 | LL | fn load(ss: &mut SomeStruct) -> Box { - | --------------- data with this lifetime... + | --------------- this data with the anonymous lifetime `'_`... ... LL | ss.r | ^^^^ ...is captured and required to be `'static` here | -help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime #2 defined on the function body at 14:1 +help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_` | LL | fn load(ss: &mut SomeStruct) -> Box { | ^^^^ diff --git a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr index 673300cebc26..4b08c4bff2eb 100644 --- a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr +++ b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr @@ -2,14 +2,14 @@ error: cannot infer an appropriate lifetime --> $DIR/region-object-lifetime-in-coercion.rs:8:46 | LL | fn a(v: &[u8]) -> Box { - | ----- data with this lifetime... + | ----- this data with the anonymous lifetime `'_`... LL | let x: Box = Box::new(v); | ---------^- | | | | | ...and is captured here | ...is required to be `'static` by this... | -help: consider changing the trait object's explicit `'static` bound +help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_` | LL | fn a(v: &[u8]) -> Box { | ^^ @@ -22,14 +22,14 @@ error: cannot infer an appropriate lifetime --> $DIR/region-object-lifetime-in-coercion.rs:13:14 | LL | fn b(v: &[u8]) -> Box { - | ----- data with this lifetime... + | ----- this data with the anonymous lifetime `'_`... LL | Box::new(v) | ---------^- | | | | | ...and is captured here | ...is required to be `'static` by this... | -help: consider changing the trait object's explicit `'static` bound +help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_` | LL | fn b(v: &[u8]) -> Box { | ^^ @@ -42,7 +42,7 @@ error: cannot infer an appropriate lifetime --> $DIR/region-object-lifetime-in-coercion.rs:19:14 | LL | fn c(v: &[u8]) -> Box { - | ----- data with this lifetime... + | ----- this data with the anonymous lifetime `'_`... ... LL | Box::new(v) | ---------^- @@ -50,7 +50,7 @@ LL | Box::new(v) | | ...and is captured here | ...is required to be `'static` by this... | -help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 16:1 +help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_` | LL | fn c(v: &[u8]) -> Box { | ^^^^ diff --git a/src/test/ui/regions/regions-close-object-into-object-2.stderr b/src/test/ui/regions/regions-close-object-into-object-2.stderr index 982ed07232a8..894be310fd14 100644 --- a/src/test/ui/regions/regions-close-object-into-object-2.stderr +++ b/src/test/ui/regions/regions-close-object-into-object-2.stderr @@ -2,14 +2,14 @@ error: cannot infer an appropriate lifetime --> $DIR/regions-close-object-into-object-2.rs:10:11 | LL | fn g<'a, T: 'static>(v: Box + 'a>) -> Box { - | ------------------ data with this lifetime... + | ------------------ this data with lifetime `'a`... LL | box B(&*v) as Box | ------^^^--------------- | | | | | ...and is captured here | ...is required to be `'static` by this... | -help: consider changing the trait object's explicit `'static` bound +help: consider changing the trait object's explicit `'static` bound to lifetime `'a` | LL | fn g<'a, T: 'static>(v: Box + 'a>) -> Box { | ^^ diff --git a/src/test/ui/regions/regions-close-object-into-object-4.stderr b/src/test/ui/regions/regions-close-object-into-object-4.stderr index 1b82098ee13c..ce261d78c290 100644 --- a/src/test/ui/regions/regions-close-object-into-object-4.stderr +++ b/src/test/ui/regions/regions-close-object-into-object-4.stderr @@ -2,14 +2,14 @@ error: cannot infer an appropriate lifetime --> $DIR/regions-close-object-into-object-4.rs:10:11 | LL | fn i<'a, T, U>(v: Box+'a>) -> Box { - | ---------------- data with this lifetime... + | ---------------- this data with lifetime `'a`... LL | box B(&*v) as Box | ------^^^--------------- | | | | | ...and is captured here | ...is required to be `'static` by this... | -help: consider changing the trait object's explicit `'static` bound +help: consider changing the trait object's explicit `'static` bound to lifetime `'a` | LL | fn i<'a, T, U>(v: Box+'a>) -> Box { | ^^ diff --git a/src/test/ui/regions/regions-proc-bound-capture.stderr b/src/test/ui/regions/regions-proc-bound-capture.stderr index e7bbfaababe8..a0df1815247c 100644 --- a/src/test/ui/regions/regions-proc-bound-capture.stderr +++ b/src/test/ui/regions/regions-proc-bound-capture.stderr @@ -2,7 +2,7 @@ error: cannot infer an appropriate lifetime --> $DIR/regions-proc-bound-capture.rs:9:14 | LL | fn static_proc(x: &isize) -> Box (isize) + 'static> { - | ------ data with this lifetime... + | ------ this data with the anonymous lifetime `'_`... LL | // This is illegal, because the region bound on `proc` is 'static. LL | Box::new(move || { *x }) | ---------^^^^^^^^^^^^^^- @@ -10,7 +10,7 @@ LL | Box::new(move || { *x }) | | ...and is captured here | ...is required to be `'static` by this... | -help: consider changing the trait object's explicit `'static` bound +help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_` | LL | fn static_proc(x: &isize) -> Box (isize) + '_> { | ^^ diff --git a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr index 1aeabce5e8aa..5520341b5b1c 100644 --- a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr +++ b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr @@ -4,7 +4,7 @@ error: cannot infer an appropriate lifetime LL | async fn f(self: Pin<&Self>) -> impl Clone { self } | ^^^^ ---------- ---------- ...and required to be `'static` by this | | | - | | data with this lifetime... + | | this data with the anonymous lifetime `'_`... | ...is captured here... error: aborting due to previous error diff --git a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr index 04c475be787b..5374929f3a45 100644 --- a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr +++ b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr @@ -5,9 +5,9 @@ LL | fn f(self: Pin<&Self>) -> impl Clone { self } | ---------- ---------- ^^^^ ...and is captured here | | | | | ...is required to be `'static` by this... - | data with this lifetime... + | this data with the anonymous lifetime `'_`... | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the method body at 6:5 +help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime `'_` | LL | fn f(self: Pin<&Self>) -> impl Clone + '_ { self } | ^^^^ diff --git a/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr b/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr index 5cf170d566ca..471f3cd14aa3 100644 --- a/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr +++ b/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr @@ -12,14 +12,14 @@ error: cannot infer an appropriate lifetime LL | fn foo(g: G, dest: &mut T) -> impl FnOnce() | ------ ------------- ...is required to be `'static` by this... | | - | data with this lifetime... + | this data with the anonymous lifetime `'_`... ... LL | / move || { LL | | *dest = g.get(); LL | | } | |_____^ ...and is captured here | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 15:1 +help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime `'_` | LL | fn foo(g: G, dest: &mut T) -> impl FnOnce() + '_ | ^^^^ diff --git a/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr b/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr index 4dc4aac6ceac..5fd03f9770e5 100644 --- a/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr +++ b/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr @@ -2,12 +2,12 @@ error: cannot infer an appropriate lifetime --> $DIR/dyn-trait-underscore.rs:8:20 | LL | fn a(items: &[T]) -> Box> { - | ---- data with this lifetime... + | ---- this data with the anonymous lifetime `'_`... LL | // ^^^^^^^^^^^^^^^^^^^^^ bound *here* defaults to `'static` LL | Box::new(items.iter()) | ---------------^^^^--- ...is captured and required to be `'static` here | -help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 6:1 +help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_` | LL | fn a(items: &[T]) -> Box + '_> { | ^^^^ From 50c422e028dd7b66302eabb987fe1da482bee8fa Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Esteban=20K=C3=BCber?= Date: Fri, 29 May 2020 19:46:22 -0700 Subject: [PATCH 04/11] Move overlapping span to a note --- .../nice_region_error/static_impl_trait.rs | 31 ++++++++++++- .../must_outlive_least_region_or_bound.stderr | 44 ++++++++++++------- src/test/ui/issues/issue-16922.stderr | 10 +++-- .../region-object-lifetime-in-coercion.stderr | 30 ++++++++----- .../regions-close-object-into-object-2.stderr | 10 +++-- .../regions-close-object-into-object-4.stderr | 10 +++-- .../regions/regions-proc-bound-capture.stderr | 10 +++-- 7 files changed, 99 insertions(+), 46 deletions(-) diff --git a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs index e9f165d309f8..cc95441b68a0 100644 --- a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs +++ b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs @@ -53,7 +53,36 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { // Customize the spans and labels depending on their relative order so // that split sentences flow correctly. - if sup_origin.span().shrink_to_hi() <= return_sp.shrink_to_lo() { + if sup_origin.span().overlaps(return_sp) && sp == sup_origin.span() { + // Avoid the following: + // + // error: cannot infer an appropriate lifetime + // --> $DIR/must_outlive_least_region_or_bound.rs:18:50 + // | + // LL | fn foo(x: &i32) -> Box { Box::new(x) } + // | ---- ---------^- + // | | | | + // | | | ...and is captured here + // | | ...is required to be `'static` by this... + // | this data with the anonymous lifetime `'_`... + // + // and instead show: + // + // error: cannot infer an appropriate lifetime + // --> $DIR/must_outlive_least_region_or_bound.rs:18:50 + // | + // LL | fn foo(x: &i32) -> Box { Box::new(x) } + // | ---- ^ ...is captured here with a `'static` requirement + // | | + // | this data with the anonymous lifetime `'_`... + // | + // note: ...is required to be `'static` by this + // | + // LL | fn elided3(x: &i32) -> Box { Box::new(x) } + // | ^^^^^^^^^^^ + err.span_label(sup_origin.span(), "...is captured here..."); + err.span_note(return_sp, "...and required to be `'static` by this"); + } else if sup_origin.span() <= return_sp { err.span_label(sup_origin.span(), "...is captured here..."); err.span_label(return_sp, "...and required to be `'static` by this"); } else { diff --git a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr index 00b6ec38323c..2da49379ea8c 100644 --- a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr +++ b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr @@ -109,12 +109,15 @@ error: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:18:50 | LL | fn elided3(x: &i32) -> Box { Box::new(x) } - | ---- ---------^- - | | | | - | | | ...and is captured here - | | ...is required to be `'static` by this... + | ---- ^ ...is captured here... + | | | this data with the anonymous lifetime `'_`... | +note: ...and required to be `'static` by this + --> $DIR/must_outlive_least_region_or_bound.rs:18:41 + | +LL | fn elided3(x: &i32) -> Box { Box::new(x) } + | ^^^^^^^^^^^ help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_` | LL | fn elided3(x: &i32) -> Box { Box::new(x) } @@ -124,12 +127,15 @@ error: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:21:59 | LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } - | ------- ---------^- - | | | | - | | | ...and is captured here - | | ...is required to be `'static` by this... + | ------- ^ ...is captured here... + | | | this data with lifetime `'a`... | +note: ...and required to be `'static` by this + --> $DIR/must_outlive_least_region_or_bound.rs:21:50 + | +LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } + | ^^^^^^^^^^^ help: to permit non-static references in a trait object value, you can add an explicit bound for lifetime `'a` | LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } @@ -139,12 +145,15 @@ error: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:24:60 | LL | fn elided4(x: &i32) -> Box { Box::new(x) } - | ---- ---------^- - | | | | - | | | ...and is captured here - | | ...is required to be `'static` by this... + | ---- ^ ...is captured here... + | | | this data with the anonymous lifetime `'_`... | +note: ...and required to be `'static` by this + --> $DIR/must_outlive_least_region_or_bound.rs:24:51 + | +LL | fn elided4(x: &i32) -> Box { Box::new(x) } + | ^^^^^^^^^^^ help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_` | LL | fn elided4(x: &i32) -> Box { Box::new(x) } @@ -158,12 +167,13 @@ error: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:27:69 | LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } - | ------- ---------^- - | | | | - | | | ...and is captured here - | | ...is required to be `'static` by this... - | this data with lifetime `'a`... + | ------- this data with lifetime `'a`... ^ ...is captured here... | +note: ...and required to be `'static` by this + --> $DIR/must_outlive_least_region_or_bound.rs:27:60 + | +LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } + | ^^^^^^^^^^^ help: consider changing the trait object's explicit `'static` bound to lifetime `'a` | LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } diff --git a/src/test/ui/issues/issue-16922.stderr b/src/test/ui/issues/issue-16922.stderr index c533a72dfc01..6c0b26a86b65 100644 --- a/src/test/ui/issues/issue-16922.stderr +++ b/src/test/ui/issues/issue-16922.stderr @@ -4,11 +4,13 @@ error: cannot infer an appropriate lifetime LL | fn foo(value: &T) -> Box { | -- this data with the anonymous lifetime `'_`... LL | Box::new(value) as Box - | ---------^^^^^- - | | | - | | ...and is captured here - | ...is required to be `'static` by this... + | ^^^^^ ...is captured here... | +note: ...and required to be `'static` by this + --> $DIR/issue-16922.rs:4:5 + | +LL | Box::new(value) as Box + | ^^^^^^^^^^^^^^^ help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_` | LL | fn foo(value: &T) -> Box { diff --git a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr index 4b08c4bff2eb..b333c314c57c 100644 --- a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr +++ b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr @@ -4,11 +4,13 @@ error: cannot infer an appropriate lifetime LL | fn a(v: &[u8]) -> Box { | ----- this data with the anonymous lifetime `'_`... LL | let x: Box = Box::new(v); - | ---------^- - | | | - | | ...and is captured here - | ...is required to be `'static` by this... + | ^ ...is captured here... | +note: ...and required to be `'static` by this + --> $DIR/region-object-lifetime-in-coercion.rs:8:37 + | +LL | let x: Box = Box::new(v); + | ^^^^^^^^^^^ help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_` | LL | fn a(v: &[u8]) -> Box { @@ -24,11 +26,13 @@ error: cannot infer an appropriate lifetime LL | fn b(v: &[u8]) -> Box { | ----- this data with the anonymous lifetime `'_`... LL | Box::new(v) - | ---------^- - | | | - | | ...and is captured here - | ...is required to be `'static` by this... + | ^ ...is captured here... | +note: ...and required to be `'static` by this + --> $DIR/region-object-lifetime-in-coercion.rs:13:5 + | +LL | Box::new(v) + | ^^^^^^^^^^^ help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_` | LL | fn b(v: &[u8]) -> Box { @@ -45,11 +49,13 @@ LL | fn c(v: &[u8]) -> Box { | ----- this data with the anonymous lifetime `'_`... ... LL | Box::new(v) - | ---------^- - | | | - | | ...and is captured here - | ...is required to be `'static` by this... + | ^ ...is captured here... + | +note: ...and required to be `'static` by this + --> $DIR/region-object-lifetime-in-coercion.rs:19:5 | +LL | Box::new(v) + | ^^^^^^^^^^^ help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_` | LL | fn c(v: &[u8]) -> Box { diff --git a/src/test/ui/regions/regions-close-object-into-object-2.stderr b/src/test/ui/regions/regions-close-object-into-object-2.stderr index 894be310fd14..3127ae65ace7 100644 --- a/src/test/ui/regions/regions-close-object-into-object-2.stderr +++ b/src/test/ui/regions/regions-close-object-into-object-2.stderr @@ -4,11 +4,13 @@ error: cannot infer an appropriate lifetime LL | fn g<'a, T: 'static>(v: Box + 'a>) -> Box { | ------------------ this data with lifetime `'a`... LL | box B(&*v) as Box - | ------^^^--------------- - | | | - | | ...and is captured here - | ...is required to be `'static` by this... + | ^^^ ...is captured here... | +note: ...and required to be `'static` by this + --> $DIR/regions-close-object-into-object-2.rs:10:5 + | +LL | box B(&*v) as Box + | ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing the trait object's explicit `'static` bound to lifetime `'a` | LL | fn g<'a, T: 'static>(v: Box + 'a>) -> Box { diff --git a/src/test/ui/regions/regions-close-object-into-object-4.stderr b/src/test/ui/regions/regions-close-object-into-object-4.stderr index ce261d78c290..b18c61f13769 100644 --- a/src/test/ui/regions/regions-close-object-into-object-4.stderr +++ b/src/test/ui/regions/regions-close-object-into-object-4.stderr @@ -4,11 +4,13 @@ error: cannot infer an appropriate lifetime LL | fn i<'a, T, U>(v: Box+'a>) -> Box { | ---------------- this data with lifetime `'a`... LL | box B(&*v) as Box - | ------^^^--------------- - | | | - | | ...and is captured here - | ...is required to be `'static` by this... + | ^^^ ...is captured here... | +note: ...and required to be `'static` by this + --> $DIR/regions-close-object-into-object-4.rs:10:5 + | +LL | box B(&*v) as Box + | ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing the trait object's explicit `'static` bound to lifetime `'a` | LL | fn i<'a, T, U>(v: Box+'a>) -> Box { diff --git a/src/test/ui/regions/regions-proc-bound-capture.stderr b/src/test/ui/regions/regions-proc-bound-capture.stderr index a0df1815247c..5cb9506afd35 100644 --- a/src/test/ui/regions/regions-proc-bound-capture.stderr +++ b/src/test/ui/regions/regions-proc-bound-capture.stderr @@ -5,11 +5,13 @@ LL | fn static_proc(x: &isize) -> Box (isize) + 'static> { | ------ this data with the anonymous lifetime `'_`... LL | // This is illegal, because the region bound on `proc` is 'static. LL | Box::new(move || { *x }) - | ---------^^^^^^^^^^^^^^- - | | | - | | ...and is captured here - | ...is required to be `'static` by this... + | ^^^^^^^^^^^^^^ ...is captured here... | +note: ...and required to be `'static` by this + --> $DIR/regions-proc-bound-capture.rs:9:5 + | +LL | Box::new(move || { *x }) + | ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_` | LL | fn static_proc(x: &isize) -> Box (isize) + '_> { From 17951e21d4c690ad70e79a40d223a0d0984c0f35 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Esteban=20K=C3=BCber?= Date: Sat, 30 May 2020 09:54:05 -0700 Subject: [PATCH 05/11] Tweak output for overlapping required/captured spans --- .../nice_region_error/static_impl_trait.rs | 10 +++---- .../must_outlive_least_region_or_bound.stderr | 28 +++---------------- src/test/ui/issues/issue-16922.stderr | 7 +---- .../region-object-lifetime-in-coercion.stderr | 21 ++------------ .../regions-close-object-into-object-2.stderr | 7 +---- .../regions-close-object-into-object-4.stderr | 7 +---- .../regions/regions-proc-bound-capture.stderr | 7 +---- 7 files changed, 15 insertions(+), 72 deletions(-) diff --git a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs index cc95441b68a0..253057536f13 100644 --- a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs +++ b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs @@ -76,12 +76,10 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { // | | // | this data with the anonymous lifetime `'_`... // | - // note: ...is required to be `'static` by this - // | - // LL | fn elided3(x: &i32) -> Box { Box::new(x) } - // | ^^^^^^^^^^^ - err.span_label(sup_origin.span(), "...is captured here..."); - err.span_note(return_sp, "...and required to be `'static` by this"); + err.span_label( + sup_origin.span(), + "...is captured here with a `'static` requirement", + ); } else if sup_origin.span() <= return_sp { err.span_label(sup_origin.span(), "...is captured here..."); err.span_label(return_sp, "...and required to be `'static` by this"); diff --git a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr index 2da49379ea8c..82e44cff9cc4 100644 --- a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr +++ b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr @@ -109,15 +109,10 @@ error: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:18:50 | LL | fn elided3(x: &i32) -> Box { Box::new(x) } - | ---- ^ ...is captured here... + | ---- ^ ...is captured here with a `'static` requirement | | | this data with the anonymous lifetime `'_`... | -note: ...and required to be `'static` by this - --> $DIR/must_outlive_least_region_or_bound.rs:18:41 - | -LL | fn elided3(x: &i32) -> Box { Box::new(x) } - | ^^^^^^^^^^^ help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_` | LL | fn elided3(x: &i32) -> Box { Box::new(x) } @@ -127,15 +122,10 @@ error: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:21:59 | LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } - | ------- ^ ...is captured here... + | ------- ^ ...is captured here with a `'static` requirement | | | this data with lifetime `'a`... | -note: ...and required to be `'static` by this - --> $DIR/must_outlive_least_region_or_bound.rs:21:50 - | -LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } - | ^^^^^^^^^^^ help: to permit non-static references in a trait object value, you can add an explicit bound for lifetime `'a` | LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } @@ -145,15 +135,10 @@ error: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:24:60 | LL | fn elided4(x: &i32) -> Box { Box::new(x) } - | ---- ^ ...is captured here... + | ---- ^ ...is captured here with a `'static` requirement | | | this data with the anonymous lifetime `'_`... | -note: ...and required to be `'static` by this - --> $DIR/must_outlive_least_region_or_bound.rs:24:51 - | -LL | fn elided4(x: &i32) -> Box { Box::new(x) } - | ^^^^^^^^^^^ help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_` | LL | fn elided4(x: &i32) -> Box { Box::new(x) } @@ -167,13 +152,8 @@ error: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:27:69 | LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } - | ------- this data with lifetime `'a`... ^ ...is captured here... + | ------- this data with lifetime `'a`... ^ ...is captured here with a `'static` requirement | -note: ...and required to be `'static` by this - --> $DIR/must_outlive_least_region_or_bound.rs:27:60 - | -LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } - | ^^^^^^^^^^^ help: consider changing the trait object's explicit `'static` bound to lifetime `'a` | LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } diff --git a/src/test/ui/issues/issue-16922.stderr b/src/test/ui/issues/issue-16922.stderr index 6c0b26a86b65..a254343cd1bb 100644 --- a/src/test/ui/issues/issue-16922.stderr +++ b/src/test/ui/issues/issue-16922.stderr @@ -4,13 +4,8 @@ error: cannot infer an appropriate lifetime LL | fn foo(value: &T) -> Box { | -- this data with the anonymous lifetime `'_`... LL | Box::new(value) as Box - | ^^^^^ ...is captured here... + | ^^^^^ ...is captured here with a `'static` requirement | -note: ...and required to be `'static` by this - --> $DIR/issue-16922.rs:4:5 - | -LL | Box::new(value) as Box - | ^^^^^^^^^^^^^^^ help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_` | LL | fn foo(value: &T) -> Box { diff --git a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr index b333c314c57c..97d1f3579fcd 100644 --- a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr +++ b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr @@ -4,13 +4,8 @@ error: cannot infer an appropriate lifetime LL | fn a(v: &[u8]) -> Box { | ----- this data with the anonymous lifetime `'_`... LL | let x: Box = Box::new(v); - | ^ ...is captured here... + | ^ ...is captured here with a `'static` requirement | -note: ...and required to be `'static` by this - --> $DIR/region-object-lifetime-in-coercion.rs:8:37 - | -LL | let x: Box = Box::new(v); - | ^^^^^^^^^^^ help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_` | LL | fn a(v: &[u8]) -> Box { @@ -26,13 +21,8 @@ error: cannot infer an appropriate lifetime LL | fn b(v: &[u8]) -> Box { | ----- this data with the anonymous lifetime `'_`... LL | Box::new(v) - | ^ ...is captured here... + | ^ ...is captured here with a `'static` requirement | -note: ...and required to be `'static` by this - --> $DIR/region-object-lifetime-in-coercion.rs:13:5 - | -LL | Box::new(v) - | ^^^^^^^^^^^ help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_` | LL | fn b(v: &[u8]) -> Box { @@ -49,13 +39,8 @@ LL | fn c(v: &[u8]) -> Box { | ----- this data with the anonymous lifetime `'_`... ... LL | Box::new(v) - | ^ ...is captured here... - | -note: ...and required to be `'static` by this - --> $DIR/region-object-lifetime-in-coercion.rs:19:5 + | ^ ...is captured here with a `'static` requirement | -LL | Box::new(v) - | ^^^^^^^^^^^ help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_` | LL | fn c(v: &[u8]) -> Box { diff --git a/src/test/ui/regions/regions-close-object-into-object-2.stderr b/src/test/ui/regions/regions-close-object-into-object-2.stderr index 3127ae65ace7..3d707f2d9994 100644 --- a/src/test/ui/regions/regions-close-object-into-object-2.stderr +++ b/src/test/ui/regions/regions-close-object-into-object-2.stderr @@ -4,13 +4,8 @@ error: cannot infer an appropriate lifetime LL | fn g<'a, T: 'static>(v: Box + 'a>) -> Box { | ------------------ this data with lifetime `'a`... LL | box B(&*v) as Box - | ^^^ ...is captured here... + | ^^^ ...is captured here with a `'static` requirement | -note: ...and required to be `'static` by this - --> $DIR/regions-close-object-into-object-2.rs:10:5 - | -LL | box B(&*v) as Box - | ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing the trait object's explicit `'static` bound to lifetime `'a` | LL | fn g<'a, T: 'static>(v: Box + 'a>) -> Box { diff --git a/src/test/ui/regions/regions-close-object-into-object-4.stderr b/src/test/ui/regions/regions-close-object-into-object-4.stderr index b18c61f13769..70282c8cbdb3 100644 --- a/src/test/ui/regions/regions-close-object-into-object-4.stderr +++ b/src/test/ui/regions/regions-close-object-into-object-4.stderr @@ -4,13 +4,8 @@ error: cannot infer an appropriate lifetime LL | fn i<'a, T, U>(v: Box+'a>) -> Box { | ---------------- this data with lifetime `'a`... LL | box B(&*v) as Box - | ^^^ ...is captured here... + | ^^^ ...is captured here with a `'static` requirement | -note: ...and required to be `'static` by this - --> $DIR/regions-close-object-into-object-4.rs:10:5 - | -LL | box B(&*v) as Box - | ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing the trait object's explicit `'static` bound to lifetime `'a` | LL | fn i<'a, T, U>(v: Box+'a>) -> Box { diff --git a/src/test/ui/regions/regions-proc-bound-capture.stderr b/src/test/ui/regions/regions-proc-bound-capture.stderr index 5cb9506afd35..8f93fad7fe9d 100644 --- a/src/test/ui/regions/regions-proc-bound-capture.stderr +++ b/src/test/ui/regions/regions-proc-bound-capture.stderr @@ -5,13 +5,8 @@ LL | fn static_proc(x: &isize) -> Box (isize) + 'static> { | ------ this data with the anonymous lifetime `'_`... LL | // This is illegal, because the region bound on `proc` is 'static. LL | Box::new(move || { *x }) - | ^^^^^^^^^^^^^^ ...is captured here... + | ^^^^^^^^^^^^^^ ...is captured here with a `'static` requirement | -note: ...and required to be `'static` by this - --> $DIR/regions-proc-bound-capture.rs:9:5 - | -LL | Box::new(move || { *x }) - | ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_` | LL | fn static_proc(x: &isize) -> Box (isize) + '_> { From 19bb589410f2ab0ff14178992ef4b44fbe5e297b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Esteban=20K=C3=BCber?= Date: Sat, 30 May 2020 10:15:58 -0700 Subject: [PATCH 06/11] Tweak wording and add error code --- .../nice_region_error/static_impl_trait.rs | 35 +++++++------ .../ui/async-await/issues/issue-62097.stderr | 6 +-- .../must_outlive_least_region_or_bound.stderr | 52 +++++++++---------- .../static-return-lifetime-infered.stderr | 12 ++--- src/test/ui/issues/issue-16922.stderr | 8 +-- ...ect-lifetime-default-from-box-error.stderr | 8 +-- .../region-object-lifetime-in-coercion.stderr | 24 ++++----- .../regions-close-object-into-object-2.stderr | 4 +- .../regions-close-object-into-object-4.stderr | 4 +- .../regions/regions-proc-bound-capture.stderr | 8 +-- ...types_pin_lifetime_impl_trait-async.stderr | 6 +-- ..._self_types_pin_lifetime_impl_trait.stderr | 8 +-- .../missing-lifetimes-in-signature.stderr | 8 +-- .../dyn-trait-underscore.stderr | 8 +-- 14 files changed, 97 insertions(+), 94 deletions(-) diff --git a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs index 253057536f13..4e16e8c2c571 100644 --- a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs +++ b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs @@ -2,7 +2,7 @@ use crate::infer::error_reporting::nice_region_error::NiceRegionError; use crate::infer::lexical_region_resolve::RegionResolutionError; -use rustc_errors::{Applicability, ErrorReported}; +use rustc_errors::{struct_span_err, Applicability, ErrorReported}; use rustc_hir::{GenericBound, ItemKind, Lifetime, LifetimeName, TyKind}; use rustc_middle::ty::RegionKind; @@ -35,10 +35,14 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { let (lifetime_name, lifetime) = if sup_r.has_name() { (sup_r.to_string(), format!("lifetime `{}`", sup_r)) } else { - ("'_".to_owned(), "the anonymous lifetime `'_`".to_string()) + ("'_".to_owned(), "an anonymous lifetime `'_`".to_string()) }; - let mut err = - self.tcx().sess.struct_span_err(sp, "cannot infer an appropriate lifetime"); + let mut err = struct_span_err!( + self.tcx().sess, + sp, + E0758, + "cannot infer an appropriate lifetime" + ); err.span_label( param_info.param_ty_span, &format!("this data with {}...", lifetime), @@ -61,10 +65,6 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { // | // LL | fn foo(x: &i32) -> Box { Box::new(x) } // | ---- ---------^- - // | | | | - // | | | ...and is captured here - // | | ...is required to be `'static` by this... - // | this data with the anonymous lifetime `'_`... // // and instead show: // @@ -72,25 +72,28 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { // --> $DIR/must_outlive_least_region_or_bound.rs:18:50 // | // LL | fn foo(x: &i32) -> Box { Box::new(x) } - // | ---- ^ ...is captured here with a `'static` requirement - // | | - // | this data with the anonymous lifetime `'_`... - // | + // | ---- ^ err.span_label( sup_origin.span(), - "...is captured here with a `'static` requirement", + "...is captured here requiring it to live as long as `'static`", ); } else if sup_origin.span() <= return_sp { err.span_label(sup_origin.span(), "...is captured here..."); - err.span_label(return_sp, "...and required to be `'static` by this"); + err.span_label( + return_sp, + "...and required to live as long as `'static` by this", + ); } else { - err.span_label(return_sp, "...is required to be `'static` by this..."); + err.span_label( + return_sp, + "...is required to live as long as `'static` by this...", + ); err.span_label(sup_origin.span(), "...and is captured here"); } } else { err.span_label( return_sp, - "...is captured and required to be `'static` here", + "...is captured and required live as long as `'static` here", ); } diff --git a/src/test/ui/async-await/issues/issue-62097.stderr b/src/test/ui/async-await/issues/issue-62097.stderr index fff43ae9f47b..558d89f92894 100644 --- a/src/test/ui/async-await/issues/issue-62097.stderr +++ b/src/test/ui/async-await/issues/issue-62097.stderr @@ -1,13 +1,13 @@ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/issue-62097.rs:12:31 | LL | pub async fn run_dummy_fn(&self) { | ^^^^^ | | - | this data with the anonymous lifetime `'_`... + | this data with an anonymous lifetime `'_`... | ...is captured here... LL | foo(|| self.bar()).await; - | --- ...and required to be `'static` by this + | --- ...and required to live as long as `'static` by this error: aborting due to previous error diff --git a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr index 82e44cff9cc4..eff56ddc440d 100644 --- a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr +++ b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr @@ -1,24 +1,24 @@ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:3:35 | LL | fn elided(x: &i32) -> impl Copy { x } | ---- --------- ^ ...and is captured here | | | - | | ...is required to be `'static` by this... - | this data with the anonymous lifetime `'_`... + | | ...is required to live as long as `'static` by this... + | this data with an anonymous lifetime `'_`... | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime `'_` +help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for an anonymous lifetime `'_` | LL | fn elided(x: &i32) -> impl Copy + '_ { x } | ^^^^ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:6:44 | LL | fn explicit<'a>(x: &'a i32) -> impl Copy { x } | ------- --------- ^ ...and is captured here | | | - | | ...is required to be `'static` by this... + | | ...is required to live as long as `'static` by this... | this data with lifetime `'a`... | help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for lifetime `'a` @@ -26,16 +26,16 @@ help: to permit non-static references in an `impl Trait` value, you can add an e LL | fn explicit<'a>(x: &'a i32) -> impl Copy + 'a { x } | ^^^^ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:9:46 | LL | fn elided2(x: &i32) -> impl Copy + 'static { x } | ---- ------------------- ^ ...and is captured here | | | - | | ...is required to be `'static` by this... - | this data with the anonymous lifetime `'_`... + | | ...is required to live as long as `'static` by this... + | this data with an anonymous lifetime `'_`... | -help: consider changing the `impl Trait`'s explicit `'static` bound to the anonymous lifetime `'_` +help: consider changing the `impl Trait`'s explicit `'static` bound to an anonymous lifetime `'_` | LL | fn elided2(x: &i32) -> impl Copy + '_ { x } | ^^ @@ -44,13 +44,13 @@ help: alternatively, set an explicit `'static` lifetime to this parameter LL | fn elided2(x: &'static i32) -> impl Copy + 'static { x } | ^^^^^^^^^^^^ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:12:55 | LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x } | ------- ------------------- ^ ...and is captured here | | | - | | ...is required to be `'static` by this... + | | ...is required to live as long as `'static` by this... | this data with lifetime `'a`... | help: consider changing the `impl Trait`'s explicit `'static` bound to lifetime `'a` @@ -70,13 +70,13 @@ LL | fn foo<'a>(x: &i32) -> impl Copy + 'a { x } | | | help: add explicit lifetime `'a` to the type of `x`: `&'a i32` -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:33:69 | LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x } | ------- -------------------------------- ^ ...and is captured here | | | - | | ...is required to be `'static` by this... + | | ...is required to live as long as `'static` by this... | this data with lifetime `'a`... | help: consider changing the `impl Trait`'s explicit `'static` bound to lifetime `'a` @@ -105,24 +105,24 @@ LL | fn ty_param_wont_outlive_static(x: T) -> impl Debug + 'static { | | | help: consider adding an explicit lifetime bound...: `T: 'static +` -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:18:50 | LL | fn elided3(x: &i32) -> Box { Box::new(x) } - | ---- ^ ...is captured here with a `'static` requirement + | ---- ^ ...is captured here requiring it to live as long as `'static` | | - | this data with the anonymous lifetime `'_`... + | this data with an anonymous lifetime `'_`... | -help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_` +help: to permit non-static references in a trait object value, you can add an explicit bound for an anonymous lifetime `'_` | LL | fn elided3(x: &i32) -> Box { Box::new(x) } | ^^^^ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:21:59 | LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } - | ------- ^ ...is captured here with a `'static` requirement + | ------- ^ ...is captured here requiring it to live as long as `'static` | | | this data with lifetime `'a`... | @@ -131,15 +131,15 @@ help: to permit non-static references in a trait object value, you can add an ex LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } | ^^^^ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:24:60 | LL | fn elided4(x: &i32) -> Box { Box::new(x) } - | ---- ^ ...is captured here with a `'static` requirement + | ---- ^ ...is captured here requiring it to live as long as `'static` | | - | this data with the anonymous lifetime `'_`... + | this data with an anonymous lifetime `'_`... | -help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_` +help: consider changing the trait object's explicit `'static` bound to an anonymous lifetime `'_` | LL | fn elided4(x: &i32) -> Box { Box::new(x) } | ^^ @@ -148,11 +148,11 @@ help: alternatively, set an explicit `'static` lifetime in this parameter LL | fn elided4(x: &'static i32) -> Box { Box::new(x) } | ^^^^^^^^^^^^ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:27:69 | LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } - | ------- this data with lifetime `'a`... ^ ...is captured here with a `'static` requirement + | ------- this data with lifetime `'a`... ^ ...is captured here requiring it to live as long as `'static` | help: consider changing the trait object's explicit `'static` bound to lifetime `'a` | diff --git a/src/test/ui/impl-trait/static-return-lifetime-infered.stderr b/src/test/ui/impl-trait/static-return-lifetime-infered.stderr index 67d4f60dff6f..a48580ee2d2f 100644 --- a/src/test/ui/impl-trait/static-return-lifetime-infered.stderr +++ b/src/test/ui/impl-trait/static-return-lifetime-infered.stderr @@ -1,25 +1,25 @@ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/static-return-lifetime-infered.rs:7:16 | LL | fn iter_values_anon(&self) -> impl Iterator { - | ----- ----------------------- ...is required to be `'static` by this... + | ----- ----------------------- ...is required to live as long as `'static` by this... | | - | this data with the anonymous lifetime `'_`... + | this data with an anonymous lifetime `'_`... LL | self.x.iter().map(|a| a.0) | ------ ^^^^ | | | ...and is captured here | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime `'_` +help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for an anonymous lifetime `'_` | LL | fn iter_values_anon(&self) -> impl Iterator + '_ { | ^^^^ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/static-return-lifetime-infered.rs:11:16 | LL | fn iter_values<'a>(&'a self) -> impl Iterator { - | -------- ----------------------- ...is required to be `'static` by this... + | -------- ----------------------- ...is required to live as long as `'static` by this... | | | this data with lifetime `'a`... LL | self.x.iter().map(|a| a.0) diff --git a/src/test/ui/issues/issue-16922.stderr b/src/test/ui/issues/issue-16922.stderr index a254343cd1bb..53fd658800a7 100644 --- a/src/test/ui/issues/issue-16922.stderr +++ b/src/test/ui/issues/issue-16922.stderr @@ -1,12 +1,12 @@ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/issue-16922.rs:4:14 | LL | fn foo(value: &T) -> Box { - | -- this data with the anonymous lifetime `'_`... + | -- this data with an anonymous lifetime `'_`... LL | Box::new(value) as Box - | ^^^^^ ...is captured here with a `'static` requirement + | ^^^^^ ...is captured here requiring it to live as long as `'static` | -help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_` +help: to permit non-static references in a trait object value, you can add an explicit bound for an anonymous lifetime `'_` | LL | fn foo(value: &T) -> Box { | ^^^^ diff --git a/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr b/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr index 6edef8086b93..04a06104faf9 100644 --- a/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr +++ b/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr @@ -1,13 +1,13 @@ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/object-lifetime-default-from-box-error.rs:18:5 | LL | fn load(ss: &mut SomeStruct) -> Box { - | --------------- this data with the anonymous lifetime `'_`... + | --------------- this data with an anonymous lifetime `'_`... ... LL | ss.r - | ^^^^ ...is captured and required to be `'static` here + | ^^^^ ...is captured and required live as long as `'static` here | -help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_` +help: to permit non-static references in a trait object value, you can add an explicit bound for an anonymous lifetime `'_` | LL | fn load(ss: &mut SomeStruct) -> Box { | ^^^^ diff --git a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr index 97d1f3579fcd..34cf131319a1 100644 --- a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr +++ b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr @@ -1,12 +1,12 @@ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/region-object-lifetime-in-coercion.rs:8:46 | LL | fn a(v: &[u8]) -> Box { - | ----- this data with the anonymous lifetime `'_`... + | ----- this data with an anonymous lifetime `'_`... LL | let x: Box = Box::new(v); - | ^ ...is captured here with a `'static` requirement + | ^ ...is captured here requiring it to live as long as `'static` | -help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_` +help: consider changing the trait object's explicit `'static` bound to an anonymous lifetime `'_` | LL | fn a(v: &[u8]) -> Box { | ^^ @@ -15,15 +15,15 @@ help: alternatively, set an explicit `'static` lifetime in this parameter LL | fn a(v: &'static [u8]) -> Box { | ^^^^^^^^^^^^^ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/region-object-lifetime-in-coercion.rs:13:14 | LL | fn b(v: &[u8]) -> Box { - | ----- this data with the anonymous lifetime `'_`... + | ----- this data with an anonymous lifetime `'_`... LL | Box::new(v) - | ^ ...is captured here with a `'static` requirement + | ^ ...is captured here requiring it to live as long as `'static` | -help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_` +help: consider changing the trait object's explicit `'static` bound to an anonymous lifetime `'_` | LL | fn b(v: &[u8]) -> Box { | ^^ @@ -32,16 +32,16 @@ help: alternatively, set an explicit `'static` lifetime in this parameter LL | fn b(v: &'static [u8]) -> Box { | ^^^^^^^^^^^^^ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/region-object-lifetime-in-coercion.rs:19:14 | LL | fn c(v: &[u8]) -> Box { - | ----- this data with the anonymous lifetime `'_`... + | ----- this data with an anonymous lifetime `'_`... ... LL | Box::new(v) - | ^ ...is captured here with a `'static` requirement + | ^ ...is captured here requiring it to live as long as `'static` | -help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_` +help: to permit non-static references in a trait object value, you can add an explicit bound for an anonymous lifetime `'_` | LL | fn c(v: &[u8]) -> Box { | ^^^^ diff --git a/src/test/ui/regions/regions-close-object-into-object-2.stderr b/src/test/ui/regions/regions-close-object-into-object-2.stderr index 3d707f2d9994..be47ef589af8 100644 --- a/src/test/ui/regions/regions-close-object-into-object-2.stderr +++ b/src/test/ui/regions/regions-close-object-into-object-2.stderr @@ -1,10 +1,10 @@ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/regions-close-object-into-object-2.rs:10:11 | LL | fn g<'a, T: 'static>(v: Box + 'a>) -> Box { | ------------------ this data with lifetime `'a`... LL | box B(&*v) as Box - | ^^^ ...is captured here with a `'static` requirement + | ^^^ ...is captured here requiring it to live as long as `'static` | help: consider changing the trait object's explicit `'static` bound to lifetime `'a` | diff --git a/src/test/ui/regions/regions-close-object-into-object-4.stderr b/src/test/ui/regions/regions-close-object-into-object-4.stderr index 70282c8cbdb3..1b099c7d8bdf 100644 --- a/src/test/ui/regions/regions-close-object-into-object-4.stderr +++ b/src/test/ui/regions/regions-close-object-into-object-4.stderr @@ -1,10 +1,10 @@ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/regions-close-object-into-object-4.rs:10:11 | LL | fn i<'a, T, U>(v: Box+'a>) -> Box { | ---------------- this data with lifetime `'a`... LL | box B(&*v) as Box - | ^^^ ...is captured here with a `'static` requirement + | ^^^ ...is captured here requiring it to live as long as `'static` | help: consider changing the trait object's explicit `'static` bound to lifetime `'a` | diff --git a/src/test/ui/regions/regions-proc-bound-capture.stderr b/src/test/ui/regions/regions-proc-bound-capture.stderr index 8f93fad7fe9d..e8baf44bd10a 100644 --- a/src/test/ui/regions/regions-proc-bound-capture.stderr +++ b/src/test/ui/regions/regions-proc-bound-capture.stderr @@ -1,13 +1,13 @@ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/regions-proc-bound-capture.rs:9:14 | LL | fn static_proc(x: &isize) -> Box (isize) + 'static> { - | ------ this data with the anonymous lifetime `'_`... + | ------ this data with an anonymous lifetime `'_`... LL | // This is illegal, because the region bound on `proc` is 'static. LL | Box::new(move || { *x }) - | ^^^^^^^^^^^^^^ ...is captured here with a `'static` requirement + | ^^^^^^^^^^^^^^ ...is captured here requiring it to live as long as `'static` | -help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_` +help: consider changing the trait object's explicit `'static` bound to an anonymous lifetime `'_` | LL | fn static_proc(x: &isize) -> Box (isize) + '_> { | ^^ diff --git a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr index 5520341b5b1c..92e1473a5da7 100644 --- a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr +++ b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr @@ -1,10 +1,10 @@ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait-async.rs:8:16 | LL | async fn f(self: Pin<&Self>) -> impl Clone { self } - | ^^^^ ---------- ---------- ...and required to be `'static` by this + | ^^^^ ---------- ---------- ...and required to live as long as `'static` by this | | | - | | this data with the anonymous lifetime `'_`... + | | this data with an anonymous lifetime `'_`... | ...is captured here... error: aborting due to previous error diff --git a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr index 5374929f3a45..6721d41bb73c 100644 --- a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr +++ b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr @@ -1,13 +1,13 @@ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait.rs:6:44 | LL | fn f(self: Pin<&Self>) -> impl Clone { self } | ---------- ---------- ^^^^ ...and is captured here | | | - | | ...is required to be `'static` by this... - | this data with the anonymous lifetime `'_`... + | | ...is required to live as long as `'static` by this... + | this data with an anonymous lifetime `'_`... | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime `'_` +help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for an anonymous lifetime `'_` | LL | fn f(self: Pin<&Self>) -> impl Clone + '_ { self } | ^^^^ diff --git a/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr b/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr index 471f3cd14aa3..ba56255af5b0 100644 --- a/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr +++ b/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr @@ -6,20 +6,20 @@ LL | fn baz(g: G, dest: &mut T) -> impl FnOnce() + '_ | | | help: consider introducing lifetime `'a` here: `'a,` -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/missing-lifetimes-in-signature.rs:19:5 | LL | fn foo(g: G, dest: &mut T) -> impl FnOnce() - | ------ ------------- ...is required to be `'static` by this... + | ------ ------------- ...is required to live as long as `'static` by this... | | - | this data with the anonymous lifetime `'_`... + | this data with an anonymous lifetime `'_`... ... LL | / move || { LL | | *dest = g.get(); LL | | } | |_____^ ...and is captured here | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime `'_` +help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for an anonymous lifetime `'_` | LL | fn foo(g: G, dest: &mut T) -> impl FnOnce() + '_ | ^^^^ diff --git a/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr b/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr index 5fd03f9770e5..20d3640d4118 100644 --- a/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr +++ b/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr @@ -1,13 +1,13 @@ -error: cannot infer an appropriate lifetime +error[E0758]: cannot infer an appropriate lifetime --> $DIR/dyn-trait-underscore.rs:8:20 | LL | fn a(items: &[T]) -> Box> { - | ---- this data with the anonymous lifetime `'_`... + | ---- this data with an anonymous lifetime `'_`... LL | // ^^^^^^^^^^^^^^^^^^^^^ bound *here* defaults to `'static` LL | Box::new(items.iter()) - | ---------------^^^^--- ...is captured and required to be `'static` here + | ---------------^^^^--- ...is captured and required live as long as `'static` here | -help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_` +help: to permit non-static references in a trait object value, you can add an explicit bound for an anonymous lifetime `'_` | LL | fn a(items: &[T]) -> Box + '_> { | ^^^^ From 3cfecdee0d677e0982cd160991130a997ffc619e Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Esteban=20K=C3=BCber?= Date: Mon, 1 Jun 2020 16:15:10 -0700 Subject: [PATCH 07/11] review comments: wording --- .../nice_region_error/static_impl_trait.rs | 58 ++++++++++--------- .../ui/async-await/issues/issue-62097.stderr | 2 +- .../must_outlive_least_region_or_bound.stderr | 46 +++++++-------- .../static-return-lifetime-infered.stderr | 8 +-- src/test/ui/issues/issue-16922.stderr | 4 +- ...ect-lifetime-default-from-box-error.stderr | 2 +- .../region-object-lifetime-in-coercion.stderr | 16 ++--- .../regions-close-object-into-object-2.stderr | 6 +- .../regions-close-object-into-object-4.stderr | 6 +- .../regions/regions-proc-bound-capture.stderr | 6 +- ...types_pin_lifetime_impl_trait-async.stderr | 2 +- ..._self_types_pin_lifetime_impl_trait.stderr | 4 +- .../missing-lifetimes-in-signature.stderr | 4 +- .../dyn-trait-underscore.stderr | 2 +- 14 files changed, 85 insertions(+), 81 deletions(-) diff --git a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs index 4e16e8c2c571..86f310eb71d7 100644 --- a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs +++ b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs @@ -75,18 +75,18 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { // | ---- ^ err.span_label( sup_origin.span(), - "...is captured here requiring it to live as long as `'static`", + "...is captured here, requiring it to live as long as `'static`", ); } else if sup_origin.span() <= return_sp { err.span_label(sup_origin.span(), "...is captured here..."); err.span_label( return_sp, - "...and required to live as long as `'static` by this", + "...and is required to live as long as `'static` here", ); } else { err.span_label( return_sp, - "...is required to live as long as `'static` by this...", + "...is required to live as long as `'static` here...", ); err.span_label(sup_origin.span(), "...and is captured here"); } @@ -101,6 +101,20 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { // explicit non-desugar'able return. if fn_return.span.desugaring_kind().is_none() { // FIXME: account for the need of parens in `&(dyn Trait + '_)` + + let consider = "consider changing the"; + let declare = "to declare that the"; + let arg = match param_info.param.pat.simple_ident() { + Some(simple_ident) => format!("argument `{}`", simple_ident), + None => "the argument".to_string(), + }; + let explicit = + format!("you can add an explicit `{}` lifetime bound", lifetime_name); + let explicit_static = format!("explicit `'static` bound to {}", arg); + let captures = format!("captures data from {}", arg); + let add_static_bound = + "alternatively, add an explicit `'static` bound to this reference"; + let plus_lt = format!(" + {}", lifetime_name); match fn_return.kind { TyKind::Def(item_id, _) => { let item = self.tcx().hir().item(item_id.id); @@ -126,18 +140,13 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { { err.span_suggestion_verbose( span, - &format!( - "consider changing the `impl Trait`'s explicit \ - `'static` bound to {}", - lifetime, - ), + &format!("{} `impl Trait`'s {}", consider, explicit_static), lifetime_name, Applicability::MaybeIncorrect, ); err.span_suggestion_verbose( param_info.param_ty_span, - "alternatively, set an explicit `'static` lifetime to \ - this parameter", + add_static_bound, param_info.param_ty.to_string(), Applicability::MaybeIncorrect, ); @@ -145,11 +154,12 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { err.span_suggestion_verbose( fn_return.span.shrink_to_hi(), &format!( - "to permit non-static references in an `impl Trait` \ - value, you can add an explicit bound for {}", - lifetime, + "{declare} `impl Trait` {captures}, {explicit}", + declare = declare, + captures = captures, + explicit = explicit, ), - format!(" + {}", lifetime_name), + plus_lt, Applicability::MaybeIncorrect, ); }; @@ -159,31 +169,25 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { err.span_suggestion_verbose( fn_return.span.shrink_to_hi(), &format!( - "to permit non-static references in a trait object \ - value, you can add an explicit bound for {}", - lifetime, + "{declare} trait object {captures}, {explicit}", + declare = declare, + captures = captures, + explicit = explicit, ), - format!(" + {}", lifetime_name), + plus_lt, Applicability::MaybeIncorrect, ); } _ => { err.span_suggestion_verbose( lt.span, - &format!( - "consider changing the trait object's explicit \ - `'static` bound to {}", - lifetime, - ), + &format!("{} trait object's {}", consider, explicit_static), lifetime_name, Applicability::MaybeIncorrect, ); err.span_suggestion_verbose( param_info.param_ty_span, - &format!( - "alternatively, set an explicit `'static` lifetime \ - in this parameter", - ), + add_static_bound, param_info.param_ty.to_string(), Applicability::MaybeIncorrect, ); diff --git a/src/test/ui/async-await/issues/issue-62097.stderr b/src/test/ui/async-await/issues/issue-62097.stderr index 558d89f92894..e9f155c6ced3 100644 --- a/src/test/ui/async-await/issues/issue-62097.stderr +++ b/src/test/ui/async-await/issues/issue-62097.stderr @@ -7,7 +7,7 @@ LL | pub async fn run_dummy_fn(&self) { | this data with an anonymous lifetime `'_`... | ...is captured here... LL | foo(|| self.bar()).await; - | --- ...and required to live as long as `'static` by this + | --- ...and is required to live as long as `'static` here error: aborting due to previous error diff --git a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr index eff56ddc440d..a9fa0e93fed6 100644 --- a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr +++ b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr @@ -4,10 +4,10 @@ error[E0758]: cannot infer an appropriate lifetime LL | fn elided(x: &i32) -> impl Copy { x } | ---- --------- ^ ...and is captured here | | | - | | ...is required to live as long as `'static` by this... + | | ...is required to live as long as `'static` here... | this data with an anonymous lifetime `'_`... | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for an anonymous lifetime `'_` +help: to declare that the `impl Trait` captures data from argument `x`, you can add an explicit `'_` lifetime bound | LL | fn elided(x: &i32) -> impl Copy + '_ { x } | ^^^^ @@ -18,10 +18,10 @@ error[E0758]: cannot infer an appropriate lifetime LL | fn explicit<'a>(x: &'a i32) -> impl Copy { x } | ------- --------- ^ ...and is captured here | | | - | | ...is required to live as long as `'static` by this... + | | ...is required to live as long as `'static` here... | this data with lifetime `'a`... | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for lifetime `'a` +help: to declare that the `impl Trait` captures data from argument `x`, you can add an explicit `'a` lifetime bound | LL | fn explicit<'a>(x: &'a i32) -> impl Copy + 'a { x } | ^^^^ @@ -32,14 +32,14 @@ error[E0758]: cannot infer an appropriate lifetime LL | fn elided2(x: &i32) -> impl Copy + 'static { x } | ---- ------------------- ^ ...and is captured here | | | - | | ...is required to live as long as `'static` by this... + | | ...is required to live as long as `'static` here... | this data with an anonymous lifetime `'_`... | -help: consider changing the `impl Trait`'s explicit `'static` bound to an anonymous lifetime `'_` +help: consider changing the `impl Trait`'s explicit `'static` bound to argument `x` | LL | fn elided2(x: &i32) -> impl Copy + '_ { x } | ^^ -help: alternatively, set an explicit `'static` lifetime to this parameter +help: alternatively, add an explicit `'static` bound to this reference | LL | fn elided2(x: &'static i32) -> impl Copy + 'static { x } | ^^^^^^^^^^^^ @@ -50,14 +50,14 @@ error[E0758]: cannot infer an appropriate lifetime LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x } | ------- ------------------- ^ ...and is captured here | | | - | | ...is required to live as long as `'static` by this... + | | ...is required to live as long as `'static` here... | this data with lifetime `'a`... | -help: consider changing the `impl Trait`'s explicit `'static` bound to lifetime `'a` +help: consider changing the `impl Trait`'s explicit `'static` bound to argument `x` | LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'a { x } | ^^ -help: alternatively, set an explicit `'static` lifetime to this parameter +help: alternatively, add an explicit `'static` bound to this reference | LL | fn explicit2<'a>(x: &'static i32) -> impl Copy + 'static { x } | ^^^^^^^^^^^^ @@ -76,14 +76,14 @@ error[E0758]: cannot infer an appropriate lifetime LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x } | ------- -------------------------------- ^ ...and is captured here | | | - | | ...is required to live as long as `'static` by this... + | | ...is required to live as long as `'static` here... | this data with lifetime `'a`... | -help: consider changing the `impl Trait`'s explicit `'static` bound to lifetime `'a` +help: consider changing the `impl Trait`'s explicit `'static` bound to argument `x` | LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'a { x } | ^^ -help: alternatively, set an explicit `'static` lifetime to this parameter +help: alternatively, add an explicit `'static` bound to this reference | LL | fn with_bound<'a>(x: &'static i32) -> impl LifetimeTrait<'a> + 'static { x } | ^^^^^^^^^^^^ @@ -109,11 +109,11 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:18:50 | LL | fn elided3(x: &i32) -> Box { Box::new(x) } - | ---- ^ ...is captured here requiring it to live as long as `'static` + | ---- ^ ...is captured here, requiring it to live as long as `'static` | | | this data with an anonymous lifetime `'_`... | -help: to permit non-static references in a trait object value, you can add an explicit bound for an anonymous lifetime `'_` +help: to declare that the trait object captures data from argument `x`, you can add an explicit `'_` lifetime bound | LL | fn elided3(x: &i32) -> Box { Box::new(x) } | ^^^^ @@ -122,11 +122,11 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:21:59 | LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } - | ------- ^ ...is captured here requiring it to live as long as `'static` + | ------- ^ ...is captured here, requiring it to live as long as `'static` | | | this data with lifetime `'a`... | -help: to permit non-static references in a trait object value, you can add an explicit bound for lifetime `'a` +help: to declare that the trait object captures data from argument `x`, you can add an explicit `'a` lifetime bound | LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } | ^^^^ @@ -135,15 +135,15 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:24:60 | LL | fn elided4(x: &i32) -> Box { Box::new(x) } - | ---- ^ ...is captured here requiring it to live as long as `'static` + | ---- ^ ...is captured here, requiring it to live as long as `'static` | | | this data with an anonymous lifetime `'_`... | -help: consider changing the trait object's explicit `'static` bound to an anonymous lifetime `'_` +help: consider changing the trait object's explicit `'static` bound to argument `x` | LL | fn elided4(x: &i32) -> Box { Box::new(x) } | ^^ -help: alternatively, set an explicit `'static` lifetime in this parameter +help: alternatively, add an explicit `'static` bound to this reference | LL | fn elided4(x: &'static i32) -> Box { Box::new(x) } | ^^^^^^^^^^^^ @@ -152,13 +152,13 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:27:69 | LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } - | ------- this data with lifetime `'a`... ^ ...is captured here requiring it to live as long as `'static` + | ------- this data with lifetime `'a`... ^ ...is captured here, requiring it to live as long as `'static` | -help: consider changing the trait object's explicit `'static` bound to lifetime `'a` +help: consider changing the trait object's explicit `'static` bound to argument `x` | LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } | ^^ -help: alternatively, set an explicit `'static` lifetime in this parameter +help: alternatively, add an explicit `'static` bound to this reference | LL | fn explicit4<'a>(x: &'static i32) -> Box { Box::new(x) } | ^^^^^^^^^^^^ diff --git a/src/test/ui/impl-trait/static-return-lifetime-infered.stderr b/src/test/ui/impl-trait/static-return-lifetime-infered.stderr index a48580ee2d2f..6681eaa909ee 100644 --- a/src/test/ui/impl-trait/static-return-lifetime-infered.stderr +++ b/src/test/ui/impl-trait/static-return-lifetime-infered.stderr @@ -2,7 +2,7 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/static-return-lifetime-infered.rs:7:16 | LL | fn iter_values_anon(&self) -> impl Iterator { - | ----- ----------------------- ...is required to live as long as `'static` by this... + | ----- ----------------------- ...is required to live as long as `'static` here... | | | this data with an anonymous lifetime `'_`... LL | self.x.iter().map(|a| a.0) @@ -10,7 +10,7 @@ LL | self.x.iter().map(|a| a.0) | | | ...and is captured here | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for an anonymous lifetime `'_` +help: to declare that the `impl Trait` captures data from argument `self`, you can add an explicit `'_` lifetime bound | LL | fn iter_values_anon(&self) -> impl Iterator + '_ { | ^^^^ @@ -19,7 +19,7 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/static-return-lifetime-infered.rs:11:16 | LL | fn iter_values<'a>(&'a self) -> impl Iterator { - | -------- ----------------------- ...is required to live as long as `'static` by this... + | -------- ----------------------- ...is required to live as long as `'static` here... | | | this data with lifetime `'a`... LL | self.x.iter().map(|a| a.0) @@ -27,7 +27,7 @@ LL | self.x.iter().map(|a| a.0) | | | ...and is captured here | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for lifetime `'a` +help: to declare that the `impl Trait` captures data from argument `self`, you can add an explicit `'a` lifetime bound | LL | fn iter_values<'a>(&'a self) -> impl Iterator + 'a { | ^^^^ diff --git a/src/test/ui/issues/issue-16922.stderr b/src/test/ui/issues/issue-16922.stderr index 53fd658800a7..95f46bd7f3eb 100644 --- a/src/test/ui/issues/issue-16922.stderr +++ b/src/test/ui/issues/issue-16922.stderr @@ -4,9 +4,9 @@ error[E0758]: cannot infer an appropriate lifetime LL | fn foo(value: &T) -> Box { | -- this data with an anonymous lifetime `'_`... LL | Box::new(value) as Box - | ^^^^^ ...is captured here requiring it to live as long as `'static` + | ^^^^^ ...is captured here, requiring it to live as long as `'static` | -help: to permit non-static references in a trait object value, you can add an explicit bound for an anonymous lifetime `'_` +help: to declare that the trait object captures data from argument `value`, you can add an explicit `'_` lifetime bound | LL | fn foo(value: &T) -> Box { | ^^^^ diff --git a/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr b/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr index 04a06104faf9..e585db262f2d 100644 --- a/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr +++ b/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr @@ -7,7 +7,7 @@ LL | fn load(ss: &mut SomeStruct) -> Box { LL | ss.r | ^^^^ ...is captured and required live as long as `'static` here | -help: to permit non-static references in a trait object value, you can add an explicit bound for an anonymous lifetime `'_` +help: to declare that the trait object captures data from argument `ss`, you can add an explicit `'_` lifetime bound | LL | fn load(ss: &mut SomeStruct) -> Box { | ^^^^ diff --git a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr index 34cf131319a1..8d048d90cb34 100644 --- a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr +++ b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr @@ -4,13 +4,13 @@ error[E0758]: cannot infer an appropriate lifetime LL | fn a(v: &[u8]) -> Box { | ----- this data with an anonymous lifetime `'_`... LL | let x: Box = Box::new(v); - | ^ ...is captured here requiring it to live as long as `'static` + | ^ ...is captured here, requiring it to live as long as `'static` | -help: consider changing the trait object's explicit `'static` bound to an anonymous lifetime `'_` +help: consider changing the trait object's explicit `'static` bound to argument `v` | LL | fn a(v: &[u8]) -> Box { | ^^ -help: alternatively, set an explicit `'static` lifetime in this parameter +help: alternatively, add an explicit `'static` bound to this reference | LL | fn a(v: &'static [u8]) -> Box { | ^^^^^^^^^^^^^ @@ -21,13 +21,13 @@ error[E0758]: cannot infer an appropriate lifetime LL | fn b(v: &[u8]) -> Box { | ----- this data with an anonymous lifetime `'_`... LL | Box::new(v) - | ^ ...is captured here requiring it to live as long as `'static` + | ^ ...is captured here, requiring it to live as long as `'static` | -help: consider changing the trait object's explicit `'static` bound to an anonymous lifetime `'_` +help: consider changing the trait object's explicit `'static` bound to argument `v` | LL | fn b(v: &[u8]) -> Box { | ^^ -help: alternatively, set an explicit `'static` lifetime in this parameter +help: alternatively, add an explicit `'static` bound to this reference | LL | fn b(v: &'static [u8]) -> Box { | ^^^^^^^^^^^^^ @@ -39,9 +39,9 @@ LL | fn c(v: &[u8]) -> Box { | ----- this data with an anonymous lifetime `'_`... ... LL | Box::new(v) - | ^ ...is captured here requiring it to live as long as `'static` + | ^ ...is captured here, requiring it to live as long as `'static` | -help: to permit non-static references in a trait object value, you can add an explicit bound for an anonymous lifetime `'_` +help: to declare that the trait object captures data from argument `v`, you can add an explicit `'_` lifetime bound | LL | fn c(v: &[u8]) -> Box { | ^^^^ diff --git a/src/test/ui/regions/regions-close-object-into-object-2.stderr b/src/test/ui/regions/regions-close-object-into-object-2.stderr index be47ef589af8..5dfe384112b2 100644 --- a/src/test/ui/regions/regions-close-object-into-object-2.stderr +++ b/src/test/ui/regions/regions-close-object-into-object-2.stderr @@ -4,13 +4,13 @@ error[E0758]: cannot infer an appropriate lifetime LL | fn g<'a, T: 'static>(v: Box + 'a>) -> Box { | ------------------ this data with lifetime `'a`... LL | box B(&*v) as Box - | ^^^ ...is captured here requiring it to live as long as `'static` + | ^^^ ...is captured here, requiring it to live as long as `'static` | -help: consider changing the trait object's explicit `'static` bound to lifetime `'a` +help: consider changing the trait object's explicit `'static` bound to argument `v` | LL | fn g<'a, T: 'static>(v: Box + 'a>) -> Box { | ^^ -help: alternatively, set an explicit `'static` lifetime in this parameter +help: alternatively, add an explicit `'static` bound to this reference | LL | fn g<'a, T: 'static>(v: std::boxed::Box<(dyn A + 'static)>) -> Box { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ diff --git a/src/test/ui/regions/regions-close-object-into-object-4.stderr b/src/test/ui/regions/regions-close-object-into-object-4.stderr index 1b099c7d8bdf..4d23118ba06f 100644 --- a/src/test/ui/regions/regions-close-object-into-object-4.stderr +++ b/src/test/ui/regions/regions-close-object-into-object-4.stderr @@ -4,13 +4,13 @@ error[E0758]: cannot infer an appropriate lifetime LL | fn i<'a, T, U>(v: Box+'a>) -> Box { | ---------------- this data with lifetime `'a`... LL | box B(&*v) as Box - | ^^^ ...is captured here requiring it to live as long as `'static` + | ^^^ ...is captured here, requiring it to live as long as `'static` | -help: consider changing the trait object's explicit `'static` bound to lifetime `'a` +help: consider changing the trait object's explicit `'static` bound to argument `v` | LL | fn i<'a, T, U>(v: Box+'a>) -> Box { | ^^ -help: alternatively, set an explicit `'static` lifetime in this parameter +help: alternatively, add an explicit `'static` bound to this reference | LL | fn i<'a, T, U>(v: std::boxed::Box<(dyn A + 'static)>) -> Box { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ diff --git a/src/test/ui/regions/regions-proc-bound-capture.stderr b/src/test/ui/regions/regions-proc-bound-capture.stderr index e8baf44bd10a..e36f77ec1da9 100644 --- a/src/test/ui/regions/regions-proc-bound-capture.stderr +++ b/src/test/ui/regions/regions-proc-bound-capture.stderr @@ -5,13 +5,13 @@ LL | fn static_proc(x: &isize) -> Box (isize) + 'static> { | ------ this data with an anonymous lifetime `'_`... LL | // This is illegal, because the region bound on `proc` is 'static. LL | Box::new(move || { *x }) - | ^^^^^^^^^^^^^^ ...is captured here requiring it to live as long as `'static` + | ^^^^^^^^^^^^^^ ...is captured here, requiring it to live as long as `'static` | -help: consider changing the trait object's explicit `'static` bound to an anonymous lifetime `'_` +help: consider changing the trait object's explicit `'static` bound to argument `x` | LL | fn static_proc(x: &isize) -> Box (isize) + '_> { | ^^ -help: alternatively, set an explicit `'static` lifetime in this parameter +help: alternatively, add an explicit `'static` bound to this reference | LL | fn static_proc(x: &'static isize) -> Box (isize) + 'static> { | ^^^^^^^^^^^^^^ diff --git a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr index 92e1473a5da7..365e38515b12 100644 --- a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr +++ b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr @@ -2,7 +2,7 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait-async.rs:8:16 | LL | async fn f(self: Pin<&Self>) -> impl Clone { self } - | ^^^^ ---------- ---------- ...and required to live as long as `'static` by this + | ^^^^ ---------- ---------- ...and is required to live as long as `'static` here | | | | | this data with an anonymous lifetime `'_`... | ...is captured here... diff --git a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr index 6721d41bb73c..bd3f3efad82f 100644 --- a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr +++ b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr @@ -4,10 +4,10 @@ error[E0758]: cannot infer an appropriate lifetime LL | fn f(self: Pin<&Self>) -> impl Clone { self } | ---------- ---------- ^^^^ ...and is captured here | | | - | | ...is required to live as long as `'static` by this... + | | ...is required to live as long as `'static` here... | this data with an anonymous lifetime `'_`... | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for an anonymous lifetime `'_` +help: to declare that the `impl Trait` captures data from argument `self`, you can add an explicit `'_` lifetime bound | LL | fn f(self: Pin<&Self>) -> impl Clone + '_ { self } | ^^^^ diff --git a/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr b/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr index ba56255af5b0..d96a5f961bdb 100644 --- a/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr +++ b/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr @@ -10,7 +10,7 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/missing-lifetimes-in-signature.rs:19:5 | LL | fn foo(g: G, dest: &mut T) -> impl FnOnce() - | ------ ------------- ...is required to live as long as `'static` by this... + | ------ ------------- ...is required to live as long as `'static` here... | | | this data with an anonymous lifetime `'_`... ... @@ -19,7 +19,7 @@ LL | | *dest = g.get(); LL | | } | |_____^ ...and is captured here | -help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for an anonymous lifetime `'_` +help: to declare that the `impl Trait` captures data from argument `dest`, you can add an explicit `'_` lifetime bound | LL | fn foo(g: G, dest: &mut T) -> impl FnOnce() + '_ | ^^^^ diff --git a/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr b/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr index 20d3640d4118..7c649f9c08d6 100644 --- a/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr +++ b/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr @@ -7,7 +7,7 @@ LL | // ^^^^^^^^^^^^^^^^^^^^^ bound *here* defaults to LL | Box::new(items.iter()) | ---------------^^^^--- ...is captured and required live as long as `'static` here | -help: to permit non-static references in a trait object value, you can add an explicit bound for an anonymous lifetime `'_` +help: to declare that the trait object captures data from argument `items`, you can add an explicit `'_` lifetime bound | LL | fn a(items: &[T]) -> Box + '_> { | ^^^^ From bdfb9b18ab7ba6c4fc27c79dde62d678c25f3b38 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Esteban=20K=C3=BCber?= Date: Mon, 1 Jun 2020 17:51:12 -0700 Subject: [PATCH 08/11] Use note for requirement source span --- .../nice_region_error/static_impl_trait.rs | 10 +--- .../ui/async-await/issues/issue-62097.stderr | 6 ++- .../must_outlive_least_region_or_bound.stderr | 50 +++++++++++++------ .../static-return-lifetime-infered.stderr | 22 +++++--- ...types_pin_lifetime_impl_trait-async.stderr | 11 ++-- ..._self_types_pin_lifetime_impl_trait.stderr | 10 ++-- .../missing-lifetimes-in-signature.stderr | 11 ++-- 7 files changed, 77 insertions(+), 43 deletions(-) diff --git a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs index 86f310eb71d7..74267a8dec05 100644 --- a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs +++ b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs @@ -77,18 +77,12 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { sup_origin.span(), "...is captured here, requiring it to live as long as `'static`", ); - } else if sup_origin.span() <= return_sp { + } else { err.span_label(sup_origin.span(), "...is captured here..."); - err.span_label( + err.span_note( return_sp, "...and is required to live as long as `'static` here", ); - } else { - err.span_label( - return_sp, - "...is required to live as long as `'static` here...", - ); - err.span_label(sup_origin.span(), "...and is captured here"); } } else { err.span_label( diff --git a/src/test/ui/async-await/issues/issue-62097.stderr b/src/test/ui/async-await/issues/issue-62097.stderr index e9f155c6ced3..ff7007dd30b1 100644 --- a/src/test/ui/async-await/issues/issue-62097.stderr +++ b/src/test/ui/async-await/issues/issue-62097.stderr @@ -6,8 +6,12 @@ LL | pub async fn run_dummy_fn(&self) { | | | this data with an anonymous lifetime `'_`... | ...is captured here... + | +note: ...and is required to live as long as `'static` here + --> $DIR/issue-62097.rs:13:9 + | LL | foo(|| self.bar()).await; - | --- ...and is required to live as long as `'static` here + | ^^^ error: aborting due to previous error diff --git a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr index a9fa0e93fed6..698464b4971a 100644 --- a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr +++ b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr @@ -2,11 +2,15 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:3:35 | LL | fn elided(x: &i32) -> impl Copy { x } - | ---- --------- ^ ...and is captured here - | | | - | | ...is required to live as long as `'static` here... + | ---- ^ ...is captured here... + | | | this data with an anonymous lifetime `'_`... | +note: ...and is required to live as long as `'static` here + --> $DIR/must_outlive_least_region_or_bound.rs:3:23 + | +LL | fn elided(x: &i32) -> impl Copy { x } + | ^^^^^^^^^ help: to declare that the `impl Trait` captures data from argument `x`, you can add an explicit `'_` lifetime bound | LL | fn elided(x: &i32) -> impl Copy + '_ { x } @@ -16,11 +20,15 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:6:44 | LL | fn explicit<'a>(x: &'a i32) -> impl Copy { x } - | ------- --------- ^ ...and is captured here - | | | - | | ...is required to live as long as `'static` here... + | ------- ^ ...is captured here... + | | | this data with lifetime `'a`... | +note: ...and is required to live as long as `'static` here + --> $DIR/must_outlive_least_region_or_bound.rs:6:32 + | +LL | fn explicit<'a>(x: &'a i32) -> impl Copy { x } + | ^^^^^^^^^ help: to declare that the `impl Trait` captures data from argument `x`, you can add an explicit `'a` lifetime bound | LL | fn explicit<'a>(x: &'a i32) -> impl Copy + 'a { x } @@ -30,11 +38,15 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:9:46 | LL | fn elided2(x: &i32) -> impl Copy + 'static { x } - | ---- ------------------- ^ ...and is captured here - | | | - | | ...is required to live as long as `'static` here... + | ---- ^ ...is captured here... + | | | this data with an anonymous lifetime `'_`... | +note: ...and is required to live as long as `'static` here + --> $DIR/must_outlive_least_region_or_bound.rs:9:24 + | +LL | fn elided2(x: &i32) -> impl Copy + 'static { x } + | ^^^^^^^^^^^^^^^^^^^ help: consider changing the `impl Trait`'s explicit `'static` bound to argument `x` | LL | fn elided2(x: &i32) -> impl Copy + '_ { x } @@ -48,11 +60,15 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:12:55 | LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x } - | ------- ------------------- ^ ...and is captured here - | | | - | | ...is required to live as long as `'static` here... + | ------- ^ ...is captured here... + | | | this data with lifetime `'a`... | +note: ...and is required to live as long as `'static` here + --> $DIR/must_outlive_least_region_or_bound.rs:12:33 + | +LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x } + | ^^^^^^^^^^^^^^^^^^^ help: consider changing the `impl Trait`'s explicit `'static` bound to argument `x` | LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'a { x } @@ -74,11 +90,13 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:33:69 | LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x } - | ------- -------------------------------- ^ ...and is captured here - | | | - | | ...is required to live as long as `'static` here... - | this data with lifetime `'a`... + | ------- this data with lifetime `'a`... ^ ...is captured here... + | +note: ...and is required to live as long as `'static` here + --> $DIR/must_outlive_least_region_or_bound.rs:33:34 | +LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x } + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing the `impl Trait`'s explicit `'static` bound to argument `x` | LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'a { x } diff --git a/src/test/ui/impl-trait/static-return-lifetime-infered.stderr b/src/test/ui/impl-trait/static-return-lifetime-infered.stderr index 6681eaa909ee..bcc46785c591 100644 --- a/src/test/ui/impl-trait/static-return-lifetime-infered.stderr +++ b/src/test/ui/impl-trait/static-return-lifetime-infered.stderr @@ -2,14 +2,17 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/static-return-lifetime-infered.rs:7:16 | LL | fn iter_values_anon(&self) -> impl Iterator { - | ----- ----------------------- ...is required to live as long as `'static` here... - | | - | this data with an anonymous lifetime `'_`... + | ----- this data with an anonymous lifetime `'_`... LL | self.x.iter().map(|a| a.0) | ------ ^^^^ | | - | ...and is captured here + | ...is captured here... | +note: ...and is required to live as long as `'static` here + --> $DIR/static-return-lifetime-infered.rs:6:35 + | +LL | fn iter_values_anon(&self) -> impl Iterator { + | ^^^^^^^^^^^^^^^^^^^^^^^ help: to declare that the `impl Trait` captures data from argument `self`, you can add an explicit `'_` lifetime bound | LL | fn iter_values_anon(&self) -> impl Iterator + '_ { @@ -19,14 +22,17 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/static-return-lifetime-infered.rs:11:16 | LL | fn iter_values<'a>(&'a self) -> impl Iterator { - | -------- ----------------------- ...is required to live as long as `'static` here... - | | - | this data with lifetime `'a`... + | -------- this data with lifetime `'a`... LL | self.x.iter().map(|a| a.0) | ------ ^^^^ | | - | ...and is captured here + | ...is captured here... | +note: ...and is required to live as long as `'static` here + --> $DIR/static-return-lifetime-infered.rs:10:37 + | +LL | fn iter_values<'a>(&'a self) -> impl Iterator { + | ^^^^^^^^^^^^^^^^^^^^^^^ help: to declare that the `impl Trait` captures data from argument `self`, you can add an explicit `'a` lifetime bound | LL | fn iter_values<'a>(&'a self) -> impl Iterator + 'a { diff --git a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr index 365e38515b12..2ffbf6e08158 100644 --- a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr +++ b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr @@ -2,10 +2,15 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait-async.rs:8:16 | LL | async fn f(self: Pin<&Self>) -> impl Clone { self } - | ^^^^ ---------- ---------- ...and is required to live as long as `'static` here - | | | - | | this data with an anonymous lifetime `'_`... + | ^^^^ ---------- this data with an anonymous lifetime `'_`... + | | | ...is captured here... + | +note: ...and is required to live as long as `'static` here + --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait-async.rs:8:37 + | +LL | async fn f(self: Pin<&Self>) -> impl Clone { self } + | ^^^^^^^^^^ error: aborting due to previous error diff --git a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr index bd3f3efad82f..2da7bcf543d6 100644 --- a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr +++ b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr @@ -2,11 +2,15 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait.rs:6:44 | LL | fn f(self: Pin<&Self>) -> impl Clone { self } - | ---------- ---------- ^^^^ ...and is captured here - | | | - | | ...is required to live as long as `'static` here... + | ---------- ^^^^ ...is captured here... + | | | this data with an anonymous lifetime `'_`... | +note: ...and is required to live as long as `'static` here + --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait.rs:6:31 + | +LL | fn f(self: Pin<&Self>) -> impl Clone { self } + | ^^^^^^^^^^ help: to declare that the `impl Trait` captures data from argument `self`, you can add an explicit `'_` lifetime bound | LL | fn f(self: Pin<&Self>) -> impl Clone + '_ { self } diff --git a/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr b/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr index d96a5f961bdb..95d905af0508 100644 --- a/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr +++ b/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr @@ -10,15 +10,18 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/missing-lifetimes-in-signature.rs:19:5 | LL | fn foo(g: G, dest: &mut T) -> impl FnOnce() - | ------ ------------- ...is required to live as long as `'static` here... - | | - | this data with an anonymous lifetime `'_`... + | ------ this data with an anonymous lifetime `'_`... ... LL | / move || { LL | | *dest = g.get(); LL | | } - | |_____^ ...and is captured here + | |_____^ ...is captured here... | +note: ...and is required to live as long as `'static` here + --> $DIR/missing-lifetimes-in-signature.rs:15:37 + | +LL | fn foo(g: G, dest: &mut T) -> impl FnOnce() + | ^^^^^^^^^^^^^ help: to declare that the `impl Trait` captures data from argument `dest`, you can add an explicit `'_` lifetime bound | LL | fn foo(g: G, dest: &mut T) -> impl FnOnce() + '_ From 215de3b3c5105982978582861b95b0b449dbff94 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Esteban=20K=C3=BCber?= Date: Tue, 2 Jun 2020 10:47:58 -0700 Subject: [PATCH 09/11] Register new eror code --- src/test/ui/async-await/issues/issue-62097.stderr | 1 + .../ui/impl-trait/must_outlive_least_region_or_bound.stderr | 2 +- src/test/ui/impl-trait/static-return-lifetime-infered.stderr | 1 + src/test/ui/issues/issue-16922.stderr | 1 + .../object-lifetime-default-from-box-error.stderr | 3 ++- src/test/ui/regions/region-object-lifetime-in-coercion.stderr | 3 ++- src/test/ui/regions/regions-close-object-into-object-2.stderr | 1 + src/test/ui/regions/regions-close-object-into-object-4.stderr | 1 + src/test/ui/regions/regions-proc-bound-capture.stderr | 1 + .../arbitrary_self_types_pin_lifetime_impl_trait-async.stderr | 1 + .../self/arbitrary_self_types_pin_lifetime_impl_trait.stderr | 1 + .../lifetimes/missing-lifetimes-in-signature.stderr | 2 +- src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr | 1 + 13 files changed, 15 insertions(+), 4 deletions(-) diff --git a/src/test/ui/async-await/issues/issue-62097.stderr b/src/test/ui/async-await/issues/issue-62097.stderr index ff7007dd30b1..b3754cce4083 100644 --- a/src/test/ui/async-await/issues/issue-62097.stderr +++ b/src/test/ui/async-await/issues/issue-62097.stderr @@ -15,3 +15,4 @@ LL | foo(|| self.bar()).await; error: aborting due to previous error +For more information about this error, try `rustc --explain E0758`. diff --git a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr index 698464b4971a..5ab450a85d9e 100644 --- a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr +++ b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr @@ -183,5 +183,5 @@ LL | fn explicit4<'a>(x: &'static i32) -> Box { Box::new(x) error: aborting due to 12 previous errors -Some errors have detailed explanations: E0310, E0621, E0623. +Some errors have detailed explanations: E0310, E0621, E0623, E0758. For more information about an error, try `rustc --explain E0310`. diff --git a/src/test/ui/impl-trait/static-return-lifetime-infered.stderr b/src/test/ui/impl-trait/static-return-lifetime-infered.stderr index bcc46785c591..90aada01d991 100644 --- a/src/test/ui/impl-trait/static-return-lifetime-infered.stderr +++ b/src/test/ui/impl-trait/static-return-lifetime-infered.stderr @@ -40,3 +40,4 @@ LL | fn iter_values<'a>(&'a self) -> impl Iterator + 'a { error: aborting due to 2 previous errors +For more information about this error, try `rustc --explain E0758`. diff --git a/src/test/ui/issues/issue-16922.stderr b/src/test/ui/issues/issue-16922.stderr index 95f46bd7f3eb..ec80f6569f5a 100644 --- a/src/test/ui/issues/issue-16922.stderr +++ b/src/test/ui/issues/issue-16922.stderr @@ -13,3 +13,4 @@ LL | fn foo(value: &T) -> Box { error: aborting due to previous error +For more information about this error, try `rustc --explain E0758`. diff --git a/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr b/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr index e585db262f2d..ac7502e004c4 100644 --- a/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr +++ b/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr @@ -23,4 +23,5 @@ LL | ss.r = b; error: aborting due to 2 previous errors -For more information about this error, try `rustc --explain E0621`. +Some errors have detailed explanations: E0621, E0758. +For more information about an error, try `rustc --explain E0621`. diff --git a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr index 8d048d90cb34..fe191e9b6956 100644 --- a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr +++ b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr @@ -79,4 +79,5 @@ LL | Box::new(v) error: aborting due to 4 previous errors -For more information about this error, try `rustc --explain E0495`. +Some errors have detailed explanations: E0495, E0758. +For more information about an error, try `rustc --explain E0495`. diff --git a/src/test/ui/regions/regions-close-object-into-object-2.stderr b/src/test/ui/regions/regions-close-object-into-object-2.stderr index 5dfe384112b2..2ea970afcede 100644 --- a/src/test/ui/regions/regions-close-object-into-object-2.stderr +++ b/src/test/ui/regions/regions-close-object-into-object-2.stderr @@ -17,3 +17,4 @@ LL | fn g<'a, T: 'static>(v: std::boxed::Box<(dyn A + 'static)>) -> Box(v: std::boxed::Box<(dyn A + 'static)>) -> Box Box (isize) + 'static> error: aborting due to previous error +For more information about this error, try `rustc --explain E0758`. diff --git a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr index 2ffbf6e08158..69022607bd19 100644 --- a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr +++ b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr @@ -14,3 +14,4 @@ LL | async fn f(self: Pin<&Self>) -> impl Clone { self } error: aborting due to previous error +For more information about this error, try `rustc --explain E0758`. diff --git a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr index 2da7bcf543d6..c37eb2d136ef 100644 --- a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr +++ b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr @@ -18,3 +18,4 @@ LL | fn f(self: Pin<&Self>) -> impl Clone + '_ { self } error: aborting due to previous error +For more information about this error, try `rustc --explain E0758`. diff --git a/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr b/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr index 95d905af0508..7e8ab1bfe163 100644 --- a/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr +++ b/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr @@ -125,5 +125,5 @@ LL | fn bak<'a, G, T>(g: G, dest: &'a mut T) -> impl FnOnce() + 'a error: aborting due to 7 previous errors -Some errors have detailed explanations: E0261, E0309, E0621. +Some errors have detailed explanations: E0261, E0309, E0621, E0758. For more information about an error, try `rustc --explain E0261`. diff --git a/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr b/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr index 7c649f9c08d6..e768d7c8ab99 100644 --- a/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr +++ b/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr @@ -14,3 +14,4 @@ LL | fn a(items: &[T]) -> Box + '_> { error: aborting due to previous error +For more information about this error, try `rustc --explain E0758`. From 187e1050a2d0ffd822e2ccc0baf8df9679bbde20 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Esteban=20K=C3=BCber?= Date: Tue, 2 Jun 2020 16:05:48 -0700 Subject: [PATCH 10/11] small tweaks --- .../nice_region_error/static_impl_trait.rs | 20 +++++++++++++------ .../ui/async-await/issues/issue-62097.stderr | 6 +----- .../must_outlive_least_region_or_bound.stderr | 10 +++++----- ...ect-lifetime-default-from-box-error.stderr | 2 +- .../region-object-lifetime-in-coercion.stderr | 4 ++-- .../regions-close-object-into-object-2.stderr | 2 +- .../regions-close-object-into-object-4.stderr | 2 +- .../regions/regions-proc-bound-capture.stderr | 2 +- ...types_pin_lifetime_impl_trait-async.stderr | 11 +++------- .../dyn-trait-underscore.stderr | 2 +- 10 files changed, 30 insertions(+), 31 deletions(-) diff --git a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs index 74267a8dec05..5ad76e396403 100644 --- a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs +++ b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs @@ -79,15 +79,22 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { ); } else { err.span_label(sup_origin.span(), "...is captured here..."); - err.span_note( - return_sp, - "...and is required to live as long as `'static` here", - ); + if return_sp < sup_origin.span() { + err.span_note( + return_sp, + "...and is required to live as long as `'static` here", + ); + } else { + err.span_label( + return_sp, + "...and is required to live as long as `'static` here", + ); + } } } else { err.span_label( return_sp, - "...is captured and required live as long as `'static` here", + "...is captured and required to live as long as `'static` here", ); } @@ -104,7 +111,8 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { }; let explicit = format!("you can add an explicit `{}` lifetime bound", lifetime_name); - let explicit_static = format!("explicit `'static` bound to {}", arg); + let explicit_static = + format!("explicit `'static` bound to the lifetime of {}", arg); let captures = format!("captures data from {}", arg); let add_static_bound = "alternatively, add an explicit `'static` bound to this reference"; diff --git a/src/test/ui/async-await/issues/issue-62097.stderr b/src/test/ui/async-await/issues/issue-62097.stderr index b3754cce4083..aa443b9d2fc1 100644 --- a/src/test/ui/async-await/issues/issue-62097.stderr +++ b/src/test/ui/async-await/issues/issue-62097.stderr @@ -6,12 +6,8 @@ LL | pub async fn run_dummy_fn(&self) { | | | this data with an anonymous lifetime `'_`... | ...is captured here... - | -note: ...and is required to live as long as `'static` here - --> $DIR/issue-62097.rs:13:9 - | LL | foo(|| self.bar()).await; - | ^^^ + | --- ...and is required to live as long as `'static` here error: aborting due to previous error diff --git a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr index 5ab450a85d9e..baed43783a13 100644 --- a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr +++ b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr @@ -47,7 +47,7 @@ note: ...and is required to live as long as `'static` here | LL | fn elided2(x: &i32) -> impl Copy + 'static { x } | ^^^^^^^^^^^^^^^^^^^ -help: consider changing the `impl Trait`'s explicit `'static` bound to argument `x` +help: consider changing the `impl Trait`'s explicit `'static` bound to the lifetime of argument `x` | LL | fn elided2(x: &i32) -> impl Copy + '_ { x } | ^^ @@ -69,7 +69,7 @@ note: ...and is required to live as long as `'static` here | LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x } | ^^^^^^^^^^^^^^^^^^^ -help: consider changing the `impl Trait`'s explicit `'static` bound to argument `x` +help: consider changing the `impl Trait`'s explicit `'static` bound to the lifetime of argument `x` | LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'a { x } | ^^ @@ -97,7 +97,7 @@ note: ...and is required to live as long as `'static` here | LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x } | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -help: consider changing the `impl Trait`'s explicit `'static` bound to argument `x` +help: consider changing the `impl Trait`'s explicit `'static` bound to the lifetime of argument `x` | LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'a { x } | ^^ @@ -157,7 +157,7 @@ LL | fn elided4(x: &i32) -> Box { Box::new(x) } | | | this data with an anonymous lifetime `'_`... | -help: consider changing the trait object's explicit `'static` bound to argument `x` +help: consider changing the trait object's explicit `'static` bound to the lifetime of argument `x` | LL | fn elided4(x: &i32) -> Box { Box::new(x) } | ^^ @@ -172,7 +172,7 @@ error[E0758]: cannot infer an appropriate lifetime LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } | ------- this data with lifetime `'a`... ^ ...is captured here, requiring it to live as long as `'static` | -help: consider changing the trait object's explicit `'static` bound to argument `x` +help: consider changing the trait object's explicit `'static` bound to the lifetime of argument `x` | LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } | ^^ diff --git a/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr b/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr index ac7502e004c4..d461001adead 100644 --- a/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr +++ b/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr @@ -5,7 +5,7 @@ LL | fn load(ss: &mut SomeStruct) -> Box { | --------------- this data with an anonymous lifetime `'_`... ... LL | ss.r - | ^^^^ ...is captured and required live as long as `'static` here + | ^^^^ ...is captured and required to live as long as `'static` here | help: to declare that the trait object captures data from argument `ss`, you can add an explicit `'_` lifetime bound | diff --git a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr index fe191e9b6956..c684373c67e9 100644 --- a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr +++ b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr @@ -6,7 +6,7 @@ LL | fn a(v: &[u8]) -> Box { LL | let x: Box = Box::new(v); | ^ ...is captured here, requiring it to live as long as `'static` | -help: consider changing the trait object's explicit `'static` bound to argument `v` +help: consider changing the trait object's explicit `'static` bound to the lifetime of argument `v` | LL | fn a(v: &[u8]) -> Box { | ^^ @@ -23,7 +23,7 @@ LL | fn b(v: &[u8]) -> Box { LL | Box::new(v) | ^ ...is captured here, requiring it to live as long as `'static` | -help: consider changing the trait object's explicit `'static` bound to argument `v` +help: consider changing the trait object's explicit `'static` bound to the lifetime of argument `v` | LL | fn b(v: &[u8]) -> Box { | ^^ diff --git a/src/test/ui/regions/regions-close-object-into-object-2.stderr b/src/test/ui/regions/regions-close-object-into-object-2.stderr index 2ea970afcede..c4ba39517983 100644 --- a/src/test/ui/regions/regions-close-object-into-object-2.stderr +++ b/src/test/ui/regions/regions-close-object-into-object-2.stderr @@ -6,7 +6,7 @@ LL | fn g<'a, T: 'static>(v: Box + 'a>) -> Box { LL | box B(&*v) as Box | ^^^ ...is captured here, requiring it to live as long as `'static` | -help: consider changing the trait object's explicit `'static` bound to argument `v` +help: consider changing the trait object's explicit `'static` bound to the lifetime of argument `v` | LL | fn g<'a, T: 'static>(v: Box + 'a>) -> Box { | ^^ diff --git a/src/test/ui/regions/regions-close-object-into-object-4.stderr b/src/test/ui/regions/regions-close-object-into-object-4.stderr index 493b7a1df992..e45930bd9571 100644 --- a/src/test/ui/regions/regions-close-object-into-object-4.stderr +++ b/src/test/ui/regions/regions-close-object-into-object-4.stderr @@ -6,7 +6,7 @@ LL | fn i<'a, T, U>(v: Box+'a>) -> Box { LL | box B(&*v) as Box | ^^^ ...is captured here, requiring it to live as long as `'static` | -help: consider changing the trait object's explicit `'static` bound to argument `v` +help: consider changing the trait object's explicit `'static` bound to the lifetime of argument `v` | LL | fn i<'a, T, U>(v: Box+'a>) -> Box { | ^^ diff --git a/src/test/ui/regions/regions-proc-bound-capture.stderr b/src/test/ui/regions/regions-proc-bound-capture.stderr index c10b9850a4e9..69c7256364d7 100644 --- a/src/test/ui/regions/regions-proc-bound-capture.stderr +++ b/src/test/ui/regions/regions-proc-bound-capture.stderr @@ -7,7 +7,7 @@ LL | // This is illegal, because the region bound on `proc` is 'static. LL | Box::new(move || { *x }) | ^^^^^^^^^^^^^^ ...is captured here, requiring it to live as long as `'static` | -help: consider changing the trait object's explicit `'static` bound to argument `x` +help: consider changing the trait object's explicit `'static` bound to the lifetime of argument `x` | LL | fn static_proc(x: &isize) -> Box (isize) + '_> { | ^^ diff --git a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr index 69022607bd19..9b04069136be 100644 --- a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr +++ b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr @@ -2,15 +2,10 @@ error[E0758]: cannot infer an appropriate lifetime --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait-async.rs:8:16 | LL | async fn f(self: Pin<&Self>) -> impl Clone { self } - | ^^^^ ---------- this data with an anonymous lifetime `'_`... - | | + | ^^^^ ---------- ---------- ...and is required to live as long as `'static` here + | | | + | | this data with an anonymous lifetime `'_`... | ...is captured here... - | -note: ...and is required to live as long as `'static` here - --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait-async.rs:8:37 - | -LL | async fn f(self: Pin<&Self>) -> impl Clone { self } - | ^^^^^^^^^^ error: aborting due to previous error diff --git a/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr b/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr index e768d7c8ab99..fc4c80194951 100644 --- a/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr +++ b/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr @@ -5,7 +5,7 @@ LL | fn a(items: &[T]) -> Box> { | ---- this data with an anonymous lifetime `'_`... LL | // ^^^^^^^^^^^^^^^^^^^^^ bound *here* defaults to `'static` LL | Box::new(items.iter()) - | ---------------^^^^--- ...is captured and required live as long as `'static` here + | ---------------^^^^--- ...is captured and required to live as long as `'static` here | help: to declare that the trait object captures data from argument `items`, you can add an explicit `'_` lifetime bound | From 6145918c83d10e9679805b8feff0286ce9e58afc Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Esteban=20K=C3=BCber?= Date: Wed, 3 Jun 2020 11:34:04 -0700 Subject: [PATCH 11/11] Change E0758 to E0759 to avoid conflict with #72912 --- src/librustc_error_codes/error_codes.rs | 1 + src/librustc_error_codes/error_codes/E0759.md | 67 +++++++++++++++++++ .../nice_region_error/static_impl_trait.rs | 2 +- .../ui/async-await/issues/issue-62097.stderr | 4 +- .../must_outlive_least_region_or_bound.stderr | 20 +++--- .../static-return-lifetime-infered.stderr | 6 +- src/test/ui/issues/issue-16922.stderr | 4 +- ...ect-lifetime-default-from-box-error.stderr | 4 +- .../region-object-lifetime-in-coercion.stderr | 8 +-- .../regions-close-object-into-object-2.stderr | 4 +- .../regions-close-object-into-object-4.stderr | 4 +- .../regions/regions-proc-bound-capture.stderr | 4 +- ...types_pin_lifetime_impl_trait-async.stderr | 4 +- ..._self_types_pin_lifetime_impl_trait.stderr | 4 +- .../missing-lifetimes-in-signature.stderr | 4 +- .../dyn-trait-underscore.stderr | 4 +- 16 files changed, 106 insertions(+), 38 deletions(-) create mode 100644 src/librustc_error_codes/error_codes/E0759.md diff --git a/src/librustc_error_codes/error_codes.rs b/src/librustc_error_codes/error_codes.rs index 760b4d7ba00a..2e3ba13f3791 100644 --- a/src/librustc_error_codes/error_codes.rs +++ b/src/librustc_error_codes/error_codes.rs @@ -438,6 +438,7 @@ E0752: include_str!("./error_codes/E0752.md"), E0753: include_str!("./error_codes/E0753.md"), E0754: include_str!("./error_codes/E0754.md"), E0758: include_str!("./error_codes/E0758.md"), +E0759: include_str!("./error_codes/E0759.md"), E0760: include_str!("./error_codes/E0760.md"), ; // E0006, // merged with E0005 diff --git a/src/librustc_error_codes/error_codes/E0759.md b/src/librustc_error_codes/error_codes/E0759.md new file mode 100644 index 000000000000..a74759bdf634 --- /dev/null +++ b/src/librustc_error_codes/error_codes/E0759.md @@ -0,0 +1,67 @@ +A `'static` requirement in a return type involving a trait is not fulfilled. + +Erroneous code examples: + +```compile_fail,E0759 +use std::fmt::Debug; + +fn foo(x: &i32) -> impl Debug { + x +} +``` + +```compile_fail,E0759 +# use std::fmt::Debug; +fn bar(x: &i32) -> Box { + Box::new(x) +} +``` + +These examples have the same semantics as the following: + +```compile_fail,E0759 +# use std::fmt::Debug; +fn foo(x: &i32) -> impl Debug + 'static { + x +} +``` + +```compile_fail,E0759 +# use std::fmt::Debug; +fn bar(x: &i32) -> Box { + Box::new(x) +} +``` + +Both [`dyn Trait`] and [`impl Trait`] in return types have a an implicit +`'static` requirement, meaning that the value implementing them that is being +returned has to be either a `'static` borrow or an owned value. + +In order to change the requirement from `'static` to be a lifetime derived from +its arguments, you can add an explicit bound, either to an anonymous lifetime +`'_` or some appropriate named lifetime. + +``` +# use std::fmt::Debug; +fn foo(x: &i32) -> impl Debug + '_ { + x +} +fn bar(x: &i32) -> Box { + Box::new(x) +} +``` + +These are equivalent to the following explicit lifetime annotations: + +``` +# use std::fmt::Debug; +fn foo<'a>(x: &'a i32) -> impl Debug + 'a { + x +} +fn bar<'a>(x: &'a i32) -> Box { + Box::new(x) +} +``` + +[`dyn Trait`]: https://doc.rust-lang.org/book/ch17-02-trait-objects.html#using-trait-objects-that-allow-for-values-of-different-types +[`impl Trait`]: https://doc.rust-lang.org/book/ch10-02-traits.html#returning-types-that-implement-traits diff --git a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs index 5ad76e396403..853a41429070 100644 --- a/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs +++ b/src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs @@ -40,7 +40,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { let mut err = struct_span_err!( self.tcx().sess, sp, - E0758, + E0759, "cannot infer an appropriate lifetime" ); err.span_label( diff --git a/src/test/ui/async-await/issues/issue-62097.stderr b/src/test/ui/async-await/issues/issue-62097.stderr index aa443b9d2fc1..0f58b158904d 100644 --- a/src/test/ui/async-await/issues/issue-62097.stderr +++ b/src/test/ui/async-await/issues/issue-62097.stderr @@ -1,4 +1,4 @@ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/issue-62097.rs:12:31 | LL | pub async fn run_dummy_fn(&self) { @@ -11,4 +11,4 @@ LL | foo(|| self.bar()).await; error: aborting due to previous error -For more information about this error, try `rustc --explain E0758`. +For more information about this error, try `rustc --explain E0759`. diff --git a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr index baed43783a13..e1fa4f02b6fc 100644 --- a/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr +++ b/src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr @@ -1,4 +1,4 @@ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:3:35 | LL | fn elided(x: &i32) -> impl Copy { x } @@ -16,7 +16,7 @@ help: to declare that the `impl Trait` captures data from argument `x`, you can LL | fn elided(x: &i32) -> impl Copy + '_ { x } | ^^^^ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:6:44 | LL | fn explicit<'a>(x: &'a i32) -> impl Copy { x } @@ -34,7 +34,7 @@ help: to declare that the `impl Trait` captures data from argument `x`, you can LL | fn explicit<'a>(x: &'a i32) -> impl Copy + 'a { x } | ^^^^ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:9:46 | LL | fn elided2(x: &i32) -> impl Copy + 'static { x } @@ -56,7 +56,7 @@ help: alternatively, add an explicit `'static` bound to this reference LL | fn elided2(x: &'static i32) -> impl Copy + 'static { x } | ^^^^^^^^^^^^ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:12:55 | LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x } @@ -86,7 +86,7 @@ LL | fn foo<'a>(x: &i32) -> impl Copy + 'a { x } | | | help: add explicit lifetime `'a` to the type of `x`: `&'a i32` -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:33:69 | LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x } @@ -123,7 +123,7 @@ LL | fn ty_param_wont_outlive_static(x: T) -> impl Debug + 'static { | | | help: consider adding an explicit lifetime bound...: `T: 'static +` -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:18:50 | LL | fn elided3(x: &i32) -> Box { Box::new(x) } @@ -136,7 +136,7 @@ help: to declare that the trait object captures data from argument `x`, you can LL | fn elided3(x: &i32) -> Box { Box::new(x) } | ^^^^ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:21:59 | LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } @@ -149,7 +149,7 @@ help: to declare that the trait object captures data from argument `x`, you can LL | fn explicit3<'a>(x: &'a i32) -> Box { Box::new(x) } | ^^^^ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:24:60 | LL | fn elided4(x: &i32) -> Box { Box::new(x) } @@ -166,7 +166,7 @@ help: alternatively, add an explicit `'static` bound to this reference LL | fn elided4(x: &'static i32) -> Box { Box::new(x) } | ^^^^^^^^^^^^ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/must_outlive_least_region_or_bound.rs:27:69 | LL | fn explicit4<'a>(x: &'a i32) -> Box { Box::new(x) } @@ -183,5 +183,5 @@ LL | fn explicit4<'a>(x: &'static i32) -> Box { Box::new(x) error: aborting due to 12 previous errors -Some errors have detailed explanations: E0310, E0621, E0623, E0758. +Some errors have detailed explanations: E0310, E0621, E0623, E0759. For more information about an error, try `rustc --explain E0310`. diff --git a/src/test/ui/impl-trait/static-return-lifetime-infered.stderr b/src/test/ui/impl-trait/static-return-lifetime-infered.stderr index 90aada01d991..df0db6e4fc6d 100644 --- a/src/test/ui/impl-trait/static-return-lifetime-infered.stderr +++ b/src/test/ui/impl-trait/static-return-lifetime-infered.stderr @@ -1,4 +1,4 @@ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/static-return-lifetime-infered.rs:7:16 | LL | fn iter_values_anon(&self) -> impl Iterator { @@ -18,7 +18,7 @@ help: to declare that the `impl Trait` captures data from argument `self`, you c LL | fn iter_values_anon(&self) -> impl Iterator + '_ { | ^^^^ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/static-return-lifetime-infered.rs:11:16 | LL | fn iter_values<'a>(&'a self) -> impl Iterator { @@ -40,4 +40,4 @@ LL | fn iter_values<'a>(&'a self) -> impl Iterator + 'a { error: aborting due to 2 previous errors -For more information about this error, try `rustc --explain E0758`. +For more information about this error, try `rustc --explain E0759`. diff --git a/src/test/ui/issues/issue-16922.stderr b/src/test/ui/issues/issue-16922.stderr index ec80f6569f5a..919594fc9af4 100644 --- a/src/test/ui/issues/issue-16922.stderr +++ b/src/test/ui/issues/issue-16922.stderr @@ -1,4 +1,4 @@ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/issue-16922.rs:4:14 | LL | fn foo(value: &T) -> Box { @@ -13,4 +13,4 @@ LL | fn foo(value: &T) -> Box { error: aborting due to previous error -For more information about this error, try `rustc --explain E0758`. +For more information about this error, try `rustc --explain E0759`. diff --git a/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr b/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr index d461001adead..1b1e0d961072 100644 --- a/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr +++ b/src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr @@ -1,4 +1,4 @@ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/object-lifetime-default-from-box-error.rs:18:5 | LL | fn load(ss: &mut SomeStruct) -> Box { @@ -23,5 +23,5 @@ LL | ss.r = b; error: aborting due to 2 previous errors -Some errors have detailed explanations: E0621, E0758. +Some errors have detailed explanations: E0621, E0759. For more information about an error, try `rustc --explain E0621`. diff --git a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr index c684373c67e9..7f5a3a47976c 100644 --- a/src/test/ui/regions/region-object-lifetime-in-coercion.stderr +++ b/src/test/ui/regions/region-object-lifetime-in-coercion.stderr @@ -1,4 +1,4 @@ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/region-object-lifetime-in-coercion.rs:8:46 | LL | fn a(v: &[u8]) -> Box { @@ -15,7 +15,7 @@ help: alternatively, add an explicit `'static` bound to this reference LL | fn a(v: &'static [u8]) -> Box { | ^^^^^^^^^^^^^ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/region-object-lifetime-in-coercion.rs:13:14 | LL | fn b(v: &[u8]) -> Box { @@ -32,7 +32,7 @@ help: alternatively, add an explicit `'static` bound to this reference LL | fn b(v: &'static [u8]) -> Box { | ^^^^^^^^^^^^^ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/region-object-lifetime-in-coercion.rs:19:14 | LL | fn c(v: &[u8]) -> Box { @@ -79,5 +79,5 @@ LL | Box::new(v) error: aborting due to 4 previous errors -Some errors have detailed explanations: E0495, E0758. +Some errors have detailed explanations: E0495, E0759. For more information about an error, try `rustc --explain E0495`. diff --git a/src/test/ui/regions/regions-close-object-into-object-2.stderr b/src/test/ui/regions/regions-close-object-into-object-2.stderr index c4ba39517983..114e4052aae0 100644 --- a/src/test/ui/regions/regions-close-object-into-object-2.stderr +++ b/src/test/ui/regions/regions-close-object-into-object-2.stderr @@ -1,4 +1,4 @@ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/regions-close-object-into-object-2.rs:10:11 | LL | fn g<'a, T: 'static>(v: Box + 'a>) -> Box { @@ -17,4 +17,4 @@ LL | fn g<'a, T: 'static>(v: std::boxed::Box<(dyn A + 'static)>) -> Box $DIR/regions-close-object-into-object-4.rs:10:11 | LL | fn i<'a, T, U>(v: Box+'a>) -> Box { @@ -17,4 +17,4 @@ LL | fn i<'a, T, U>(v: std::boxed::Box<(dyn A + 'static)>) -> Box $DIR/regions-proc-bound-capture.rs:9:14 | LL | fn static_proc(x: &isize) -> Box (isize) + 'static> { @@ -18,4 +18,4 @@ LL | fn static_proc(x: &'static isize) -> Box (isize) + 'static> error: aborting due to previous error -For more information about this error, try `rustc --explain E0758`. +For more information about this error, try `rustc --explain E0759`. diff --git a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr index 9b04069136be..88bd990b1e81 100644 --- a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr +++ b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr @@ -1,4 +1,4 @@ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait-async.rs:8:16 | LL | async fn f(self: Pin<&Self>) -> impl Clone { self } @@ -9,4 +9,4 @@ LL | async fn f(self: Pin<&Self>) -> impl Clone { self } error: aborting due to previous error -For more information about this error, try `rustc --explain E0758`. +For more information about this error, try `rustc --explain E0759`. diff --git a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr index c37eb2d136ef..2e10ab3d3f9b 100644 --- a/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr +++ b/src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr @@ -1,4 +1,4 @@ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/arbitrary_self_types_pin_lifetime_impl_trait.rs:6:44 | LL | fn f(self: Pin<&Self>) -> impl Clone { self } @@ -18,4 +18,4 @@ LL | fn f(self: Pin<&Self>) -> impl Clone + '_ { self } error: aborting due to previous error -For more information about this error, try `rustc --explain E0758`. +For more information about this error, try `rustc --explain E0759`. diff --git a/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr b/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr index 7e8ab1bfe163..9ab060328537 100644 --- a/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr +++ b/src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr @@ -6,7 +6,7 @@ LL | fn baz(g: G, dest: &mut T) -> impl FnOnce() + '_ | | | help: consider introducing lifetime `'a` here: `'a,` -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/missing-lifetimes-in-signature.rs:19:5 | LL | fn foo(g: G, dest: &mut T) -> impl FnOnce() @@ -125,5 +125,5 @@ LL | fn bak<'a, G, T>(g: G, dest: &'a mut T) -> impl FnOnce() + 'a error: aborting due to 7 previous errors -Some errors have detailed explanations: E0261, E0309, E0621, E0758. +Some errors have detailed explanations: E0261, E0309, E0621, E0759. For more information about an error, try `rustc --explain E0261`. diff --git a/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr b/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr index fc4c80194951..dda5de431d30 100644 --- a/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr +++ b/src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr @@ -1,4 +1,4 @@ -error[E0758]: cannot infer an appropriate lifetime +error[E0759]: cannot infer an appropriate lifetime --> $DIR/dyn-trait-underscore.rs:8:20 | LL | fn a(items: &[T]) -> Box> { @@ -14,4 +14,4 @@ LL | fn a(items: &[T]) -> Box + '_> { error: aborting due to previous error -For more information about this error, try `rustc --explain E0758`. +For more information about this error, try `rustc --explain E0759`.