From 431b9aa38ff466fbed1b933cd17efa10f6cd03b4 Mon Sep 17 00:00:00 2001 From: Michael Goulet Date: Sun, 23 Feb 2025 04:46:51 +0000 Subject: [PATCH] Fix missing self subst when rendering Fn* trait with no output type --- compiler/rustc_middle/src/ty/print/pretty.rs | 24 +++++++++++-------- tests/crashes/133597.rs | 11 --------- .../unboxed-closures/existential-printing.rs | 8 +++++++ .../existential-printing.stderr | 17 +++++++++++++ 4 files changed, 39 insertions(+), 21 deletions(-) delete mode 100644 tests/crashes/133597.rs create mode 100644 tests/ui/unboxed-closures/existential-printing.rs create mode 100644 tests/ui/unboxed-closures/existential-printing.stderr diff --git a/compiler/rustc_middle/src/ty/print/pretty.rs b/compiler/rustc_middle/src/ty/print/pretty.rs index 11b430dd358d..ed0839f47e69 100644 --- a/compiler/rustc_middle/src/ty/print/pretty.rs +++ b/compiler/rustc_middle/src/ty/print/pretty.rs @@ -232,7 +232,7 @@ pub trait PrettyPrinter<'tcx>: Printer<'tcx> + fmt::Write { f: F, ) -> Result<(), PrintError> where - T: Print<'tcx, Self> + TypeFoldable>, + T: TypeFoldable>, { f(value.as_ref().skip_binder(), self) } @@ -1056,7 +1056,7 @@ pub trait PrettyPrinter<'tcx>: Printer<'tcx> + fmt::Write { // Insert parenthesis around (Fn(A, B) -> C) if the opaque ty has more than one other trait let paren_needed = fn_traits.len() > 1 || traits.len() > 0 || !has_sized_bound; - for ((bound_args, is_async), entry) in fn_traits { + for ((bound_args_and_self_ty, is_async), entry) in fn_traits { write!(self, "{}", if first { "" } else { " + " })?; write!(self, "{}", if paren_needed { "(" } else { "" })?; @@ -1067,7 +1067,7 @@ pub trait PrettyPrinter<'tcx>: Printer<'tcx> + fmt::Write { }; if let Some(return_ty) = entry.return_ty { - self.wrap_binder(&bound_args, |args, cx| { + self.wrap_binder(&bound_args_and_self_ty, |(args, _), cx| { define_scoped_cx!(cx); p!(write("{}", tcx.item_name(trait_def_id))); p!("("); @@ -1093,9 +1093,13 @@ pub trait PrettyPrinter<'tcx>: Printer<'tcx> + fmt::Write { } else { // Otherwise, render this like a regular trait. traits.insert( - bound_args.map_bound(|args| ty::TraitPredicate { + bound_args_and_self_ty.map_bound(|(args, self_ty)| ty::TraitPredicate { polarity: ty::PredicatePolarity::Positive, - trait_ref: ty::TraitRef::new(tcx, trait_def_id, [Ty::new_tup(tcx, args)]), + trait_ref: ty::TraitRef::new( + tcx, + trait_def_id, + [self_ty, Ty::new_tup(tcx, args)], + ), }), FxIndexMap::default(), ); @@ -1229,7 +1233,7 @@ pub trait PrettyPrinter<'tcx>: Printer<'tcx> + fmt::Write { FxIndexMap>>, >, fn_traits: &mut FxIndexMap< - (ty::Binder<'tcx, &'tcx ty::List>>, bool), + (ty::Binder<'tcx, (&'tcx ty::List>, Ty<'tcx>)>, bool), OpaqueFnEntry<'tcx>, >, ) { @@ -1249,7 +1253,7 @@ pub trait PrettyPrinter<'tcx>: Printer<'tcx> + fmt::Write { && let ty::Tuple(types) = *trait_pred.skip_binder().trait_ref.args.type_at(1).kind() { let entry = fn_traits - .entry((trait_pred.rebind(types), is_async)) + .entry((trait_pred.rebind((types, trait_pred.skip_binder().self_ty())), is_async)) .or_insert_with(|| OpaqueFnEntry { kind, return_ty: None }); if kind.extends(entry.kind) { entry.kind = kind; @@ -2379,7 +2383,7 @@ impl<'tcx> PrettyPrinter<'tcx> for FmtPrinter<'_, 'tcx> { f: C, ) -> Result<(), PrintError> where - T: Print<'tcx, Self> + TypeFoldable>, + T: TypeFoldable>, { self.pretty_wrap_binder(value, f) } @@ -2633,7 +2637,7 @@ impl<'tcx> FmtPrinter<'_, 'tcx> { value: &ty::Binder<'tcx, T>, ) -> Result<(T, UnordMap>), fmt::Error> where - T: Print<'tcx, Self> + TypeFoldable>, + T: TypeFoldable>, { fn name_by_region_index( index: usize, @@ -2814,7 +2818,7 @@ impl<'tcx> FmtPrinter<'_, 'tcx> { f: C, ) -> Result<(), fmt::Error> where - T: Print<'tcx, Self> + TypeFoldable>, + T: TypeFoldable>, { let old_region_index = self.region_index; let (new_value, _) = self.name_all_regions(value)?; diff --git a/tests/crashes/133597.rs b/tests/crashes/133597.rs deleted file mode 100644 index f716d5e7bc74..000000000000 --- a/tests/crashes/133597.rs +++ /dev/null @@ -1,11 +0,0 @@ -//@ known-bug: #133597 - -pub trait Foo2 { - fn boxed<'a: 'a>() -> impl Sized + FnOnce<()>; -} - -impl Foo2 for () {} - - -fn f() -> impl FnOnce<()> { || () } -fn main() { () = f(); } diff --git a/tests/ui/unboxed-closures/existential-printing.rs b/tests/ui/unboxed-closures/existential-printing.rs new file mode 100644 index 000000000000..f43373202091 --- /dev/null +++ b/tests/ui/unboxed-closures/existential-printing.rs @@ -0,0 +1,8 @@ +// Make sure we don't ICE printing `impl AsyncFnOnce<()>`. + +#![feature(unboxed_closures, fn_traits)] + +fn f() -> impl FnOnce<()> { || () } + +fn main() { () = f(); } +//~^ ERROR mismatched types diff --git a/tests/ui/unboxed-closures/existential-printing.stderr b/tests/ui/unboxed-closures/existential-printing.stderr new file mode 100644 index 000000000000..95de98878aff --- /dev/null +++ b/tests/ui/unboxed-closures/existential-printing.stderr @@ -0,0 +1,17 @@ +error[E0308]: mismatched types + --> $DIR/existential-printing.rs:7:13 + | +LL | fn f() -> impl FnOnce<()> { || () } + | --------------- the expected opaque type +LL | +LL | fn main() { () = f(); } + | ^^ --- this expression has type `impl FnOnce<()>` + | | + | expected opaque type, found `()` + | + = note: expected opaque type `impl FnOnce<()>` + found unit type `()` + +error: aborting due to 1 previous error + +For more information about this error, try `rustc --explain E0308`.