diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs index e4af7022239b8..8910194f3ee1e 100644 --- a/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs +++ b/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs @@ -450,12 +450,27 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> { { "consider using `()`, or a `Result`".to_owned() } else { - format!( - "{}the trait `{}` is not implemented for `{}`", - pre_message, - trait_predicate.print_modifiers_and_trait_path(), - trait_ref.skip_binder().self_ty(), - ) + let ty_desc = match trait_ref.skip_binder().self_ty().kind() { + ty::FnDef(_, _) => Some("fn item"), + ty::Closure(_, _) => Some("closure"), + _ => None, + }; + + match ty_desc { + Some(desc) => format!( + "{}the trait `{}` is not implemented for {} `{}`", + pre_message, + trait_predicate.print_modifiers_and_trait_path(), + desc, + trait_ref.skip_binder().self_ty(), + ), + None => format!( + "{}the trait `{}` is not implemented for `{}`", + pre_message, + trait_predicate.print_modifiers_and_trait_path(), + trait_ref.skip_binder().self_ty(), + ), + } }; if self.suggest_add_reference_to_arg( @@ -1805,13 +1820,21 @@ impl<'a, 'tcx> InferCtxtPrivExt<'a, 'tcx> for InferCtxt<'a, 'tcx> { return false; } if candidates.len() == 1 { + let ty_desc = match candidates[0].self_ty().kind() { + ty::FnPtr(_) => Some("fn pointer"), + _ => None, + }; + let the_desc = match ty_desc { + Some(desc) => format!(" implemented for {} `", desc), + None => " implemented for `".to_string(), + }; err.highlighted_help(vec![ ( format!("the trait `{}` ", candidates[0].print_only_trait_path()), Style::NoStyle, ), ("is".to_string(), Style::Highlight), - (" implemented for `".to_string(), Style::NoStyle), + (the_desc, Style::NoStyle), (candidates[0].self_ty().to_string(), Style::Highlight), ("`".to_string(), Style::NoStyle), ]); diff --git a/src/test/ui/async-await/issues/issue-62009-1.stderr b/src/test/ui/async-await/issues/issue-62009-1.stderr index fb9dee11f2a07..0e323443ae8b3 100644 --- a/src/test/ui/async-await/issues/issue-62009-1.stderr +++ b/src/test/ui/async-await/issues/issue-62009-1.stderr @@ -30,7 +30,7 @@ error[E0277]: `[closure@$DIR/issue-62009-1.rs:12:6: 12:9]` is not a future LL | (|_| 2333).await; | ^^^^^^ `[closure@$DIR/issue-62009-1.rs:12:6: 12:9]` is not a future | - = help: the trait `Future` is not implemented for `[closure@$DIR/issue-62009-1.rs:12:6: 12:9]` + = help: the trait `Future` is not implemented for closure `[closure@$DIR/issue-62009-1.rs:12:6: 12:9]` = note: [closure@$DIR/issue-62009-1.rs:12:6: 12:9] must be a future or must implement `IntoFuture` to be awaited = note: required for `[closure@$DIR/issue-62009-1.rs:12:6: 12:9]` to implement `IntoFuture` help: remove the `.await` diff --git a/src/test/ui/binop/issue-77910-1.stderr b/src/test/ui/binop/issue-77910-1.stderr index 68303b842088e..097a14f26f868 100644 --- a/src/test/ui/binop/issue-77910-1.stderr +++ b/src/test/ui/binop/issue-77910-1.stderr @@ -18,7 +18,7 @@ LL | fn foo(s: &i32) -> &i32 { LL | assert_eq!(foo, y); | ^^^^^^^^^^^^^^^^^^ `for<'r> fn(&'r i32) -> &'r i32 {foo}` cannot be formatted using `{:?}` because it doesn't implement `Debug` | - = help: the trait `Debug` is not implemented for `for<'r> fn(&'r i32) -> &'r i32 {foo}` + = help: the trait `Debug` is not implemented for fn item `for<'r> fn(&'r i32) -> &'r i32 {foo}` = help: use parentheses to call the function: `foo(s)` = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info) diff --git a/src/test/ui/closures/coerce-unsafe-to-closure.stderr b/src/test/ui/closures/coerce-unsafe-to-closure.stderr index bd095c2d83d8a..6ce63e829b314 100644 --- a/src/test/ui/closures/coerce-unsafe-to-closure.stderr +++ b/src/test/ui/closures/coerce-unsafe-to-closure.stderr @@ -6,7 +6,7 @@ LL | let x: Option<&[u8]> = Some("foo").map(std::mem::transmute); | | | required by a bound introduced by this call | - = help: the trait `FnOnce<(&str,)>` is not implemented for `unsafe extern "rust-intrinsic" fn(_) -> _ {transmute::<_, _>}` + = help: the trait `FnOnce<(&str,)>` is not implemented for fn item `unsafe extern "rust-intrinsic" fn(_) -> _ {transmute::<_, _>}` = note: unsafe function cannot be called generically without an unsafe block note: required by a bound in `Option::::map` --> $SRC_DIR/core/src/option.rs:LL:COL diff --git a/src/test/ui/extern/extern-wrong-value-type.stderr b/src/test/ui/extern/extern-wrong-value-type.stderr index c6f0d5df9b53b..ff2934a2ba883 100644 --- a/src/test/ui/extern/extern-wrong-value-type.stderr +++ b/src/test/ui/extern/extern-wrong-value-type.stderr @@ -6,7 +6,7 @@ LL | is_fn(f); | | | required by a bound introduced by this call | - = help: the trait `Fn<()>` is not implemented for `extern "C" fn() {f}` + = help: the trait `Fn<()>` is not implemented for fn item `extern "C" fn() {f}` = note: wrap the `extern "C" fn() {f}` in a closure with no arguments: `|| { /* code */ }` note: required by a bound in `is_fn` --> $DIR/extern-wrong-value-type.rs:4:28 diff --git a/src/test/ui/intrinsics/const-eval-select-bad.stderr b/src/test/ui/intrinsics/const-eval-select-bad.stderr index 1a761ad5441ce..904e83624b3f2 100644 --- a/src/test/ui/intrinsics/const-eval-select-bad.stderr +++ b/src/test/ui/intrinsics/const-eval-select-bad.stderr @@ -6,7 +6,7 @@ LL | const_eval_select((), || {}, || {}); | | | required by a bound introduced by this call | - = help: the trait `~const FnOnce<()>` is not implemented for `[closure@$DIR/const-eval-select-bad.rs:7:27: 7:29]` + = help: the trait `~const FnOnce<()>` is not implemented for closure `[closure@$DIR/const-eval-select-bad.rs:7:27: 7:29]` note: the trait `FnOnce<()>` is implemented for `[closure@$DIR/const-eval-select-bad.rs:7:27: 7:29]`, but that implementation is not `const` --> $DIR/const-eval-select-bad.rs:7:27 | diff --git a/src/test/ui/issues/issue-59488.stderr b/src/test/ui/issues/issue-59488.stderr index bb6843a19586e..229dfcca47a20 100644 --- a/src/test/ui/issues/issue-59488.stderr +++ b/src/test/ui/issues/issue-59488.stderr @@ -93,7 +93,7 @@ error[E0277]: `fn(usize) -> Foo {Foo::Bar}` doesn't implement `Debug` LL | assert_eq!(Foo::Bar, i); | ^^^^^^^^^^^^^^^^^^^^^^^ `fn(usize) -> Foo {Foo::Bar}` cannot be formatted using `{:?}` because it doesn't implement `Debug` | - = help: the trait `Debug` is not implemented for `fn(usize) -> Foo {Foo::Bar}` + = help: the trait `Debug` is not implemented for fn item `fn(usize) -> Foo {Foo::Bar}` = help: the following other types implement trait `Debug`: extern "C" fn() -> Ret extern "C" fn(A, B) -> Ret @@ -112,7 +112,7 @@ error[E0277]: `fn(usize) -> Foo {Foo::Bar}` doesn't implement `Debug` LL | assert_eq!(Foo::Bar, i); | ^^^^^^^^^^^^^^^^^^^^^^^ `fn(usize) -> Foo {Foo::Bar}` cannot be formatted using `{:?}` because it doesn't implement `Debug` | - = help: the trait `Debug` is not implemented for `fn(usize) -> Foo {Foo::Bar}` + = help: the trait `Debug` is not implemented for fn item `fn(usize) -> Foo {Foo::Bar}` = help: the following other types implement trait `Debug`: extern "C" fn() -> Ret extern "C" fn(A, B) -> Ret diff --git a/src/test/ui/issues/issue-70724-add_type_neq_err_label-unwrap.stderr b/src/test/ui/issues/issue-70724-add_type_neq_err_label-unwrap.stderr index c6e6ea1e096af..b80abad2f67e9 100644 --- a/src/test/ui/issues/issue-70724-add_type_neq_err_label-unwrap.stderr +++ b/src/test/ui/issues/issue-70724-add_type_neq_err_label-unwrap.stderr @@ -33,7 +33,7 @@ LL | fn a() -> i32 { LL | assert_eq!(a, 0); | ^^^^^^^^^^^^^^^^ `fn() -> i32 {a}` cannot be formatted using `{:?}` because it doesn't implement `Debug` | - = help: the trait `Debug` is not implemented for `fn() -> i32 {a}` + = help: the trait `Debug` is not implemented for fn item `fn() -> i32 {a}` = help: use parentheses to call the function: `a()` = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info) diff --git a/src/test/ui/issues/issue-99875.rs b/src/test/ui/issues/issue-99875.rs new file mode 100644 index 0000000000000..cf73fd8d31fbb --- /dev/null +++ b/src/test/ui/issues/issue-99875.rs @@ -0,0 +1,16 @@ +struct Argument; +struct Return; + +fn function(_: Argument) -> Return { todo!() } + +trait Trait {} +impl Trait for fn(Argument) -> Return {} + +fn takes(_: impl Trait) {} + +fn main() { + takes(function); + //~^ ERROR the trait bound + takes(|_: Argument| -> Return { todo!() }); + //~^ ERROR the trait bound +} diff --git a/src/test/ui/issues/issue-99875.stderr b/src/test/ui/issues/issue-99875.stderr new file mode 100644 index 0000000000000..3ff8f12f1b8ce --- /dev/null +++ b/src/test/ui/issues/issue-99875.stderr @@ -0,0 +1,33 @@ +error[E0277]: the trait bound `fn(Argument) -> Return {function}: Trait` is not satisfied + --> $DIR/issue-99875.rs:12:11 + | +LL | takes(function); + | ----- ^^^^^^^^ the trait `Trait` is not implemented for fn item `fn(Argument) -> Return {function}` + | | + | required by a bound introduced by this call + | + = help: the trait `Trait` is implemented for fn pointer `fn(Argument) -> Return` +note: required by a bound in `takes` + --> $DIR/issue-99875.rs:9:18 + | +LL | fn takes(_: impl Trait) {} + | ^^^^^ required by this bound in `takes` + +error[E0277]: the trait bound `[closure@$DIR/issue-99875.rs:14:11: 14:34]: Trait` is not satisfied + --> $DIR/issue-99875.rs:14:11 + | +LL | takes(|_: Argument| -> Return { todo!() }); + | ----- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Trait` is not implemented for closure `[closure@$DIR/issue-99875.rs:14:11: 14:34]` + | | + | required by a bound introduced by this call + | + = help: the trait `Trait` is implemented for fn pointer `fn(Argument) -> Return` +note: required by a bound in `takes` + --> $DIR/issue-99875.rs:9:18 + | +LL | fn takes(_: impl Trait) {} + | ^^^^^ required by this bound in `takes` + +error: aborting due to 2 previous errors + +For more information about this error, try `rustc --explain E0277`. diff --git a/src/test/ui/namespace/namespace-mix.stderr b/src/test/ui/namespace/namespace-mix.stderr index b04ea14d1a580..c07914df7273a 100644 --- a/src/test/ui/namespace/namespace-mix.stderr +++ b/src/test/ui/namespace/namespace-mix.stderr @@ -218,7 +218,7 @@ error[E0277]: the trait bound `fn() -> c::TS {c::TS}: Impossible` is not satisfi --> $DIR/namespace-mix.rs:56:11 | LL | check(m3::TS); - | ----- ^^^^^^ the trait `Impossible` is not implemented for `fn() -> c::TS {c::TS}` + | ----- ^^^^^^ the trait `Impossible` is not implemented for fn item `fn() -> c::TS {c::TS}` | | | required by a bound introduced by this call | @@ -274,7 +274,7 @@ error[E0277]: the trait bound `fn() -> namespace_mix::c::TS {namespace_mix::c::T --> $DIR/namespace-mix.rs:62:11 | LL | check(xm3::TS); - | ----- ^^^^^^^ the trait `Impossible` is not implemented for `fn() -> namespace_mix::c::TS {namespace_mix::c::TS}` + | ----- ^^^^^^^ the trait `Impossible` is not implemented for fn item `fn() -> namespace_mix::c::TS {namespace_mix::c::TS}` | | | required by a bound introduced by this call | @@ -526,7 +526,7 @@ error[E0277]: the trait bound `fn() -> c::E {c::E::TV}: Impossible` is not satis --> $DIR/namespace-mix.rs:122:11 | LL | check(m9::TV); - | ----- ^^^^^^ the trait `Impossible` is not implemented for `fn() -> c::E {c::E::TV}` + | ----- ^^^^^^ the trait `Impossible` is not implemented for fn item `fn() -> c::E {c::E::TV}` | | | required by a bound introduced by this call | @@ -582,7 +582,7 @@ error[E0277]: the trait bound `fn() -> namespace_mix::c::E {namespace_mix::xm7:: --> $DIR/namespace-mix.rs:128:11 | LL | check(xm9::TV); - | ----- ^^^^^^^ the trait `Impossible` is not implemented for `fn() -> namespace_mix::c::E {namespace_mix::xm7::TV}` + | ----- ^^^^^^^ the trait `Impossible` is not implemented for fn item `fn() -> namespace_mix::c::E {namespace_mix::xm7::TV}` | | | required by a bound introduced by this call | diff --git a/src/test/ui/proc-macro/signature.stderr b/src/test/ui/proc-macro/signature.stderr index 78b0beff0da39..59b3e44c74a52 100644 --- a/src/test/ui/proc-macro/signature.stderr +++ b/src/test/ui/proc-macro/signature.stderr @@ -10,7 +10,7 @@ LL | | } | |_call the function in a closure: `|| unsafe { /* code */ }` | required by a bound introduced by this call | - = help: the trait `Fn<(proc_macro::TokenStream,)>` is not implemented for `unsafe extern "C" fn(i32, u32) -> u32 {foo}` + = help: the trait `Fn<(proc_macro::TokenStream,)>` is not implemented for fn item `unsafe extern "C" fn(i32, u32) -> u32 {foo}` = note: unsafe function cannot be called generically without an unsafe block note: required by a bound in `ProcMacro::custom_derive` --> $SRC_DIR/proc_macro/src/bridge/client.rs:LL:COL diff --git a/src/test/ui/rfcs/rfc-2396-target_feature-11/fn-traits.stderr b/src/test/ui/rfcs/rfc-2396-target_feature-11/fn-traits.stderr index 94a90a5685489..fc7bf22775dd7 100644 --- a/src/test/ui/rfcs/rfc-2396-target_feature-11/fn-traits.stderr +++ b/src/test/ui/rfcs/rfc-2396-target_feature-11/fn-traits.stderr @@ -6,7 +6,7 @@ LL | call(foo); | | | required by a bound introduced by this call | - = help: the trait `Fn<()>` is not implemented for `fn() {foo}` + = help: the trait `Fn<()>` is not implemented for fn item `fn() {foo}` = note: wrap the `fn() {foo}` in a closure with no arguments: `|| { /* code */ }` = note: `#[target_feature]` functions do not implement the `Fn` traits note: required by a bound in `call` @@ -23,7 +23,7 @@ LL | call_mut(foo); | | | required by a bound introduced by this call | - = help: the trait `FnMut<()>` is not implemented for `fn() {foo}` + = help: the trait `FnMut<()>` is not implemented for fn item `fn() {foo}` = note: wrap the `fn() {foo}` in a closure with no arguments: `|| { /* code */ }` = note: `#[target_feature]` functions do not implement the `Fn` traits note: required by a bound in `call_mut` @@ -40,7 +40,7 @@ LL | call_once(foo); | | | required by a bound introduced by this call | - = help: the trait `FnOnce<()>` is not implemented for `fn() {foo}` + = help: the trait `FnOnce<()>` is not implemented for fn item `fn() {foo}` = note: wrap the `fn() {foo}` in a closure with no arguments: `|| { /* code */ }` = note: `#[target_feature]` functions do not implement the `Fn` traits note: required by a bound in `call_once` @@ -57,7 +57,7 @@ LL | call(foo_unsafe); | | | required by a bound introduced by this call | - = help: the trait `Fn<()>` is not implemented for `unsafe fn() {foo_unsafe}` + = help: the trait `Fn<()>` is not implemented for fn item `unsafe fn() {foo_unsafe}` = note: wrap the `unsafe fn() {foo_unsafe}` in a closure with no arguments: `|| { /* code */ }` = note: `#[target_feature]` functions do not implement the `Fn` traits note: required by a bound in `call` @@ -74,7 +74,7 @@ LL | call_mut(foo_unsafe); | | | required by a bound introduced by this call | - = help: the trait `FnMut<()>` is not implemented for `unsafe fn() {foo_unsafe}` + = help: the trait `FnMut<()>` is not implemented for fn item `unsafe fn() {foo_unsafe}` = note: wrap the `unsafe fn() {foo_unsafe}` in a closure with no arguments: `|| { /* code */ }` = note: `#[target_feature]` functions do not implement the `Fn` traits note: required by a bound in `call_mut` @@ -91,7 +91,7 @@ LL | call_once(foo_unsafe); | | | required by a bound introduced by this call | - = help: the trait `FnOnce<()>` is not implemented for `unsafe fn() {foo_unsafe}` + = help: the trait `FnOnce<()>` is not implemented for fn item `unsafe fn() {foo_unsafe}` = note: wrap the `unsafe fn() {foo_unsafe}` in a closure with no arguments: `|| { /* code */ }` = note: `#[target_feature]` functions do not implement the `Fn` traits note: required by a bound in `call_once` diff --git a/src/test/ui/suggestions/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.stderr b/src/test/ui/suggestions/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.stderr index c7d420e0aae83..bfd506c9f6e0c 100644 --- a/src/test/ui/suggestions/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.stderr +++ b/src/test/ui/suggestions/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.stderr @@ -9,7 +9,7 @@ LL | bar(foo); | | | required by a bound introduced by this call | - = help: the trait `Future` is not implemented for `fn() -> impl Future {foo}` + = help: the trait `Future` is not implemented for fn item `fn() -> impl Future {foo}` = note: fn() -> impl Future {foo} must be a future or must implement `IntoFuture` to be awaited note: required by a bound in `bar` --> $DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:7:16 @@ -31,7 +31,7 @@ LL | bar(async_closure); | | | required by a bound introduced by this call | - = help: the trait `Future` is not implemented for `[closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:33]` + = help: the trait `Future` is not implemented for closure `[closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:33]` = note: [closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:33] must be a future or must implement `IntoFuture` to be awaited note: required by a bound in `bar` --> $DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:7:16 diff --git a/src/test/ui/suggestions/fn-ctor-passed-as-arg-where-it-should-have-been-called.stderr b/src/test/ui/suggestions/fn-ctor-passed-as-arg-where-it-should-have-been-called.stderr index fb0a6f70bfb46..fe603b67575d3 100644 --- a/src/test/ui/suggestions/fn-ctor-passed-as-arg-where-it-should-have-been-called.stderr +++ b/src/test/ui/suggestions/fn-ctor-passed-as-arg-where-it-should-have-been-called.stderr @@ -5,7 +5,7 @@ LL | fn foo() -> impl T { S } | --- consider calling this function ... LL | bar(foo); - | --- ^^^ the trait `T` is not implemented for `fn() -> impl T {foo}` + | --- ^^^ the trait `T` is not implemented for fn item `fn() -> impl T {foo}` | | | required by a bound introduced by this call | @@ -25,7 +25,7 @@ error[E0277]: the trait bound `[closure@$DIR/fn-ctor-passed-as-arg-where-it-shou LL | let closure = || S; | -- consider calling this closure LL | bar(closure); - | --- ^^^^^^^ the trait `T` is not implemented for `[closure@$DIR/fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:18:19: 18:21]` + | --- ^^^^^^^ the trait `T` is not implemented for closure `[closure@$DIR/fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:18:19: 18:21]` | | | required by a bound introduced by this call | diff --git a/src/test/ui/unboxed-closures/unboxed-closures-unsafe-extern-fn.stderr b/src/test/ui/unboxed-closures/unboxed-closures-unsafe-extern-fn.stderr index 18e133957ba37..9833304c636b1 100644 --- a/src/test/ui/unboxed-closures/unboxed-closures-unsafe-extern-fn.stderr +++ b/src/test/ui/unboxed-closures/unboxed-closures-unsafe-extern-fn.stderr @@ -6,7 +6,7 @@ LL | let x = call_it(&square, 22); | | | required by a bound introduced by this call | - = help: the trait `for<'r> Fn<(&'r isize,)>` is not implemented for `for<'r> unsafe fn(&'r isize) -> isize {square}` + = help: the trait `for<'r> Fn<(&'r isize,)>` is not implemented for fn item `for<'r> unsafe fn(&'r isize) -> isize {square}` = note: unsafe function cannot be called generically without an unsafe block note: required by a bound in `call_it` --> $DIR/unboxed-closures-unsafe-extern-fn.rs:9:15 @@ -22,7 +22,7 @@ LL | let y = call_it_mut(&mut square, 22); | | | required by a bound introduced by this call | - = help: the trait `for<'r> FnMut<(&'r isize,)>` is not implemented for `for<'r> unsafe fn(&'r isize) -> isize {square}` + = help: the trait `for<'r> FnMut<(&'r isize,)>` is not implemented for fn item `for<'r> unsafe fn(&'r isize) -> isize {square}` = note: unsafe function cannot be called generically without an unsafe block note: required by a bound in `call_it_mut` --> $DIR/unboxed-closures-unsafe-extern-fn.rs:12:19 @@ -38,7 +38,7 @@ LL | let z = call_it_once(square, 22); | | | required by a bound introduced by this call | - = help: the trait `for<'r> FnOnce<(&'r isize,)>` is not implemented for `for<'r> unsafe fn(&'r isize) -> isize {square}` + = help: the trait `for<'r> FnOnce<(&'r isize,)>` is not implemented for fn item `for<'r> unsafe fn(&'r isize) -> isize {square}` = note: unsafe function cannot be called generically without an unsafe block note: required by a bound in `call_it_once` --> $DIR/unboxed-closures-unsafe-extern-fn.rs:15:20 diff --git a/src/test/ui/unboxed-closures/unboxed-closures-wrong-abi.stderr b/src/test/ui/unboxed-closures/unboxed-closures-wrong-abi.stderr index 77c176de625ca..54c92e0cd040c 100644 --- a/src/test/ui/unboxed-closures/unboxed-closures-wrong-abi.stderr +++ b/src/test/ui/unboxed-closures/unboxed-closures-wrong-abi.stderr @@ -6,7 +6,7 @@ LL | let x = call_it(&square, 22); | | | required by a bound introduced by this call | - = help: the trait `for<'r> Fn<(&'r isize,)>` is not implemented for `for<'r> extern "C" fn(&'r isize) -> isize {square}` + = help: the trait `for<'r> Fn<(&'r isize,)>` is not implemented for fn item `for<'r> extern "C" fn(&'r isize) -> isize {square}` note: required by a bound in `call_it` --> $DIR/unboxed-closures-wrong-abi.rs:9:15 | @@ -21,7 +21,7 @@ LL | let y = call_it_mut(&mut square, 22); | | | required by a bound introduced by this call | - = help: the trait `for<'r> FnMut<(&'r isize,)>` is not implemented for `for<'r> extern "C" fn(&'r isize) -> isize {square}` + = help: the trait `for<'r> FnMut<(&'r isize,)>` is not implemented for fn item `for<'r> extern "C" fn(&'r isize) -> isize {square}` note: required by a bound in `call_it_mut` --> $DIR/unboxed-closures-wrong-abi.rs:12:19 | @@ -36,7 +36,7 @@ LL | let z = call_it_once(square, 22); | | | required by a bound introduced by this call | - = help: the trait `for<'r> FnOnce<(&'r isize,)>` is not implemented for `for<'r> extern "C" fn(&'r isize) -> isize {square}` + = help: the trait `for<'r> FnOnce<(&'r isize,)>` is not implemented for fn item `for<'r> extern "C" fn(&'r isize) -> isize {square}` note: required by a bound in `call_it_once` --> $DIR/unboxed-closures-wrong-abi.rs:15:20 | diff --git a/src/test/ui/unboxed-closures/unboxed-closures-wrong-arg-type-extern-fn.stderr b/src/test/ui/unboxed-closures/unboxed-closures-wrong-arg-type-extern-fn.stderr index c826af3c4c38f..2fedb5b92c289 100644 --- a/src/test/ui/unboxed-closures/unboxed-closures-wrong-arg-type-extern-fn.stderr +++ b/src/test/ui/unboxed-closures/unboxed-closures-wrong-arg-type-extern-fn.stderr @@ -6,7 +6,7 @@ LL | let x = call_it(&square, 22); | | | required by a bound introduced by this call | - = help: the trait `for<'r> Fn<(&'r isize,)>` is not implemented for `unsafe fn(isize) -> isize {square}` + = help: the trait `for<'r> Fn<(&'r isize,)>` is not implemented for fn item `unsafe fn(isize) -> isize {square}` = note: unsafe function cannot be called generically without an unsafe block note: required by a bound in `call_it` --> $DIR/unboxed-closures-wrong-arg-type-extern-fn.rs:10:15 @@ -22,7 +22,7 @@ LL | let y = call_it_mut(&mut square, 22); | | | required by a bound introduced by this call | - = help: the trait `for<'r> FnMut<(&'r isize,)>` is not implemented for `unsafe fn(isize) -> isize {square}` + = help: the trait `for<'r> FnMut<(&'r isize,)>` is not implemented for fn item `unsafe fn(isize) -> isize {square}` = note: unsafe function cannot be called generically without an unsafe block note: required by a bound in `call_it_mut` --> $DIR/unboxed-closures-wrong-arg-type-extern-fn.rs:13:19 @@ -38,7 +38,7 @@ LL | let z = call_it_once(square, 22); | | | required by a bound introduced by this call | - = help: the trait `for<'r> FnOnce<(&'r isize,)>` is not implemented for `unsafe fn(isize) -> isize {square}` + = help: the trait `for<'r> FnOnce<(&'r isize,)>` is not implemented for fn item `unsafe fn(isize) -> isize {square}` = note: unsafe function cannot be called generically without an unsafe block note: required by a bound in `call_it_once` --> $DIR/unboxed-closures-wrong-arg-type-extern-fn.rs:16:20