Rollup merge of #116431 - estebank:issue-80476, r=compiler-errors

workingjubilee · web-flow · commit d7b02c3d409c · 2023-10-05T00:56:30.000-07:00
Tweak wording of E0562 Fix #80476.
diff --git a/compiler/rustc_ast_lowering/messages.ftl b/compiler/rustc_ast_lowering/messages.ftl
@@ -99,7 +99,7 @@ ast_lowering_misplaced_double_dot =
     .note = only allowed in tuple, tuple struct, and slice patterns
 
 ast_lowering_misplaced_impl_trait =
-    `impl Trait` only allowed in function and inherent method return types, not in {$position}
+    `impl Trait` only allowed in function and inherent method argument and return types, not in {$position}
 
 ast_lowering_misplaced_relax_trait_bound =
     `?Trait` bounds are only permitted at the point where a type parameter is declared
diff --git a/tests/ui/associated-consts/issue-105330.stderr b/tests/ui/associated-consts/issue-105330.stderr
@@ -33,7 +33,7 @@ LL | fn main<A: TraitWAssocConst<A=32>>() {
    = note: see issue #92827 <https://github.com/rust-lang/rust/issues/92827> for more information
    = help: add `#![feature(associated_const_equality)]` to the crate attributes to enable
 
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in impl headers
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in impl headers
   --> $DIR/issue-105330.rs:6:27
    |
 LL | impl TraitWAssocConst for impl Demo {
diff --git a/tests/ui/async-await/in-trait/fn-not-async-err2.rs b/tests/ui/async-await/in-trait/fn-not-async-err2.rs
@@ -11,7 +11,7 @@ trait MyTrait {
 
 impl MyTrait for i32 {
     fn foo(&self) -> impl Future<Output = i32> {
-        //~^ ERROR `impl Trait` only allowed in function and inherent method return types, not in `impl` method return types
+        //~^ ERROR `impl Trait` only allowed in function and inherent method argument and return types, not in `impl` method return types
         async { *self }
     }
 }
diff --git a/tests/ui/async-await/in-trait/fn-not-async-err2.stderr b/tests/ui/async-await/in-trait/fn-not-async-err2.stderr
@@ -1,4 +1,4 @@
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `impl` method return types
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in `impl` method return types
   --> $DIR/fn-not-async-err2.rs:13:22
    |
 LL |     fn foo(&self) -> impl Future<Output = i32> {
diff --git a/tests/ui/feature-gates/feature-gate-associated_type_bounds.rs b/tests/ui/feature-gates/feature-gate-associated_type_bounds.rs
@@ -54,20 +54,20 @@ fn _rpit_dyn() -> Box<dyn Tr1<As1: Copy>> { Box::new(S1) }
 
 const _cdef: impl Tr1<As1: Copy> = S1;
 //~^ ERROR associated type bounds are unstable
-//~| ERROR `impl Trait` only allowed in function and inherent method return types
+//~| ERROR `impl Trait` only allowed in function and inherent method argument and return types
 // FIXME: uncomment when `impl_trait_in_bindings` feature is fixed.
 // const _cdef_dyn: &dyn Tr1<As1: Copy> = &S1;
 
 static _sdef: impl Tr1<As1: Copy> = S1;
 //~^ ERROR associated type bounds are unstable
-//~| ERROR `impl Trait` only allowed in function and inherent method return types
+//~| ERROR `impl Trait` only allowed in function and inherent method argument and return types
 // FIXME: uncomment when `impl_trait_in_bindings` feature is fixed.
 // static _sdef_dyn: &dyn Tr1<As1: Copy> = &S1;
 
 fn main() {
     let _: impl Tr1<As1: Copy> = S1;
     //~^ ERROR associated type bounds are unstable
-    //~| ERROR `impl Trait` only allowed in function and inherent method return types
+    //~| ERROR `impl Trait` only allowed in function and inherent method argument and return types
     // FIXME: uncomment when `impl_trait_in_bindings` feature is fixed.
     // let _: &dyn Tr1<As1: Copy> = &S1;
 }
diff --git a/tests/ui/feature-gates/feature-gate-associated_type_bounds.stderr b/tests/ui/feature-gates/feature-gate-associated_type_bounds.stderr
@@ -115,19 +115,19 @@ LL |     let _: impl Tr1<As1: Copy> = S1;
    = note: see issue #52662 <https://github.com/rust-lang/rust/issues/52662> for more information
    = help: add `#![feature(associated_type_bounds)]` to the crate attributes to enable
 
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in const types
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in const types
   --> $DIR/feature-gate-associated_type_bounds.rs:55:14
    |
 LL | const _cdef: impl Tr1<As1: Copy> = S1;
    |              ^^^^^^^^^^^^^^^^^^^
 
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in const types
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in const types
   --> $DIR/feature-gate-associated_type_bounds.rs:61:15
    |
 LL | static _sdef: impl Tr1<As1: Copy> = S1;
    |               ^^^^^^^^^^^^^^^^^^^
 
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in variable bindings
   --> $DIR/feature-gate-associated_type_bounds.rs:68:12
    |
 LL |     let _: impl Tr1<As1: Copy> = S1;
diff --git a/tests/ui/feature-gates/feature-gate-impl_trait_in_fn_trait_return.rs b/tests/ui/feature-gates/feature-gate-impl_trait_in_fn_trait_return.rs
@@ -1,6 +1,6 @@
 fn f() -> impl Fn() -> impl Sized { || () }
-//~^ ERROR `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return
+//~^ ERROR `impl Trait` only allowed in function and inherent method argument and return types, not in `Fn` trait return
 fn g() -> &'static dyn Fn() -> impl Sized { &|| () }
-//~^ ERROR `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return
+//~^ ERROR `impl Trait` only allowed in function and inherent method argument and return types, not in `Fn` trait return
 
 fn main() {}
diff --git a/tests/ui/feature-gates/feature-gate-impl_trait_in_fn_trait_return.stderr b/tests/ui/feature-gates/feature-gate-impl_trait_in_fn_trait_return.stderr
@@ -1,4 +1,4 @@
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return types
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in `Fn` trait return types
   --> $DIR/feature-gate-impl_trait_in_fn_trait_return.rs:1:24
    |
 LL | fn f() -> impl Fn() -> impl Sized { || () }
@@ -7,7 +7,7 @@ LL | fn f() -> impl Fn() -> impl Sized { || () }
    = note: see issue #99697 <https://github.com/rust-lang/rust/issues/99697> for more information
    = help: add `#![feature(impl_trait_in_fn_trait_return)]` to the crate attributes to enable
 
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return types
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in `Fn` trait return types
   --> $DIR/feature-gate-impl_trait_in_fn_trait_return.rs:3:32
    |
 LL | fn g() -> &'static dyn Fn() -> impl Sized { &|| () }
diff --git a/tests/ui/feature-gates/feature-gate-return_position_impl_trait_in_trait.rs b/tests/ui/feature-gates/feature-gate-return_position_impl_trait_in_trait.rs
@@ -5,14 +5,14 @@
 #![feature(async_fn_in_trait)]
 
 trait Foo {
-    fn bar() -> impl Sized; //~ ERROR `impl Trait` only allowed in function and inherent method return types, not in trait method return
-    fn baz() -> Box<impl std::fmt::Display>; //~ ERROR `impl Trait` only allowed in function and inherent method return types, not in trait method return
+    fn bar() -> impl Sized; //~ ERROR `impl Trait` only allowed in function and inherent method argument and return types, not in trait method return
+    fn baz() -> Box<impl std::fmt::Display>; //~ ERROR `impl Trait` only allowed in function and inherent method argument and return types, not in trait method return
 }
 
 // Both return_position_impl_trait_in_trait and async_fn_in_trait are required for this (see also
 // feature-gate-async_fn_in_trait.rs)
 trait AsyncFoo {
-    async fn bar() -> impl Sized; //~ ERROR `impl Trait` only allowed in function and inherent method return types, not in trait method return
+    async fn bar() -> impl Sized; //~ ERROR `impl Trait` only allowed in function and inherent method argument and return types, not in trait method return
 }
 
 fn main() {}
diff --git a/tests/ui/feature-gates/feature-gate-return_position_impl_trait_in_trait.stderr b/tests/ui/feature-gates/feature-gate-return_position_impl_trait_in_trait.stderr
@@ -1,4 +1,4 @@
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in trait method return types
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in trait method return types
   --> $DIR/feature-gate-return_position_impl_trait_in_trait.rs:8:17
    |
 LL |     fn bar() -> impl Sized;
@@ -7,7 +7,7 @@ LL |     fn bar() -> impl Sized;
    = note: see issue #91611 <https://github.com/rust-lang/rust/issues/91611> for more information
    = help: add `#![feature(return_position_impl_trait_in_trait)]` to the crate attributes to enable
 
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in trait method return types
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in trait method return types
   --> $DIR/feature-gate-return_position_impl_trait_in_trait.rs:9:21
    |
 LL |     fn baz() -> Box<impl std::fmt::Display>;
@@ -16,7 +16,7 @@ LL |     fn baz() -> Box<impl std::fmt::Display>;
    = note: see issue #91611 <https://github.com/rust-lang/rust/issues/91611> for more information
    = help: add `#![feature(return_position_impl_trait_in_trait)]` to the crate attributes to enable
 
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in trait method return types
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in trait method return types
   --> $DIR/feature-gate-return_position_impl_trait_in_trait.rs:15:23
    |
 LL |     async fn bar() -> impl Sized;
diff --git a/tests/ui/impl-trait/issues/issue-54600.rs b/tests/ui/impl-trait/issues/issue-54600.rs
@@ -2,6 +2,6 @@ use std::fmt::Debug;
 
 fn main() {
     let x: Option<impl Debug> = Some(44_u32);
-    //~^ `impl Trait` only allowed in function and inherent method return types
+    //~^ `impl Trait` only allowed in function and inherent method argument and return types
     println!("{:?}", x);
 }
diff --git a/tests/ui/impl-trait/issues/issue-54600.stderr b/tests/ui/impl-trait/issues/issue-54600.stderr
@@ -1,4 +1,4 @@
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in variable bindings
   --> $DIR/issue-54600.rs:4:19
    |
 LL |     let x: Option<impl Debug> = Some(44_u32);
diff --git a/tests/ui/impl-trait/issues/issue-54840.rs b/tests/ui/impl-trait/issues/issue-54840.rs
@@ -3,5 +3,5 @@ use std::ops::Add;
 fn main() {
     let i: i32 = 0;
     let j: &impl Add = &i;
-    //~^ `impl Trait` only allowed in function and inherent method return types
+    //~^ `impl Trait` only allowed in function and inherent method argument and return types
 }
diff --git a/tests/ui/impl-trait/issues/issue-54840.stderr b/tests/ui/impl-trait/issues/issue-54840.stderr
@@ -1,4 +1,4 @@
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in variable bindings
   --> $DIR/issue-54840.rs:5:13
    |
 LL |     let j: &impl Add = &i;
diff --git a/tests/ui/impl-trait/issues/issue-58504.rs b/tests/ui/impl-trait/issues/issue-58504.rs
@@ -8,5 +8,5 @@ fn mk_gen() -> impl Generator<Return=!, Yield=()> {
 
 fn main() {
     let gens: [impl Generator<Return=!, Yield=()>;2] = [ mk_gen(), mk_gen() ];
-    //~^ `impl Trait` only allowed in function and inherent method return types
+    //~^ `impl Trait` only allowed in function and inherent method argument and return types
 }
diff --git a/tests/ui/impl-trait/issues/issue-58504.stderr b/tests/ui/impl-trait/issues/issue-58504.stderr
@@ -1,4 +1,4 @@
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in variable bindings
   --> $DIR/issue-58504.rs:10:16
    |
 LL |     let gens: [impl Generator<Return=!, Yield=()>;2] = [ mk_gen(), mk_gen() ];
diff --git a/tests/ui/impl-trait/issues/issue-58956.rs b/tests/ui/impl-trait/issues/issue-58956.rs
@@ -5,9 +5,9 @@ impl Lam for B {}
 pub struct Wrap<T>(T);
 
 const _A: impl Lam = {
-    //~^ `impl Trait` only allowed in function and inherent method return types
+    //~^ `impl Trait` only allowed in function and inherent method argument and return types
     let x: Wrap<impl Lam> = Wrap(B);
-    //~^ `impl Trait` only allowed in function and inherent method return types
+    //~^ `impl Trait` only allowed in function and inherent method argument and return types
     x.0
 };
 
diff --git a/tests/ui/impl-trait/issues/issue-58956.stderr b/tests/ui/impl-trait/issues/issue-58956.stderr
@@ -1,10 +1,10 @@
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in const types
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in const types
   --> $DIR/issue-58956.rs:7:11
    |
 LL | const _A: impl Lam = {
    |           ^^^^^^^^
 
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in variable bindings
   --> $DIR/issue-58956.rs:9:17
    |
 LL |     let x: Wrap<impl Lam> = Wrap(B);
diff --git a/tests/ui/impl-trait/issues/issue-70971.rs b/tests/ui/impl-trait/issues/issue-70971.rs
@@ -1,4 +1,4 @@
 fn main() {
     let x : (impl Copy,) = (true,);
-    //~^ `impl Trait` only allowed in function and inherent method return types
+    //~^ `impl Trait` only allowed in function and inherent method argument and return types
 }
diff --git a/tests/ui/impl-trait/issues/issue-70971.stderr b/tests/ui/impl-trait/issues/issue-70971.stderr
@@ -1,4 +1,4 @@
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in variable bindings
   --> $DIR/issue-70971.rs:2:14
    |
 LL |     let x : (impl Copy,) = (true,);
diff --git a/tests/ui/impl-trait/issues/issue-79099.rs b/tests/ui/impl-trait/issues/issue-79099.rs
@@ -1,7 +1,7 @@
 struct Bug {
     V1: [(); {
         let f: impl core::future::Future<Output = u8> = async { 1 };
-        //~^ `impl Trait` only allowed in function and inherent method return types
+        //~^ `impl Trait` only allowed in function and inherent method argument and return types
         //~| expected identifier
         1
     }],
diff --git a/tests/ui/impl-trait/issues/issue-79099.stderr b/tests/ui/impl-trait/issues/issue-79099.stderr
@@ -9,7 +9,7 @@ LL |         let f: impl core::future::Future<Output = u8> = async { 1 };
    = help: pass `--edition 2021` to `rustc`
    = note: for more on editions, read https://doc.rust-lang.org/edition-guide
 
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in variable bindings
   --> $DIR/issue-79099.rs:3:16
    |
 LL |         let f: impl core::future::Future<Output = u8> = async { 1 };
diff --git a/tests/ui/impl-trait/issues/issue-83929-impl-trait-in-generic-default.rs b/tests/ui/impl-trait/issues/issue-83929-impl-trait-in-generic-default.rs
@@ -1,8 +1,8 @@
 struct Foo<T = impl Copy>(T);
-//~^ ERROR `impl Trait` only allowed in function and inherent method return types
+//~^ ERROR `impl Trait` only allowed in function and inherent method argument and return types
 
 type Result<T, E = impl std::error::Error> = std::result::Result<T, E>;
-//~^ ERROR `impl Trait` only allowed in function and inherent method return types
+//~^ ERROR `impl Trait` only allowed in function and inherent method argument and return types
 
 // should not cause ICE
 fn x() -> Foo {
diff --git a/tests/ui/impl-trait/issues/issue-83929-impl-trait-in-generic-default.stderr b/tests/ui/impl-trait/issues/issue-83929-impl-trait-in-generic-default.stderr
@@ -1,10 +1,10 @@
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter defaults
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in generic parameter defaults
   --> $DIR/issue-83929-impl-trait-in-generic-default.rs:1:16
    |
 LL | struct Foo<T = impl Copy>(T);
    |                ^^^^^^^^^
 
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in generic parameter defaults
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in generic parameter defaults
   --> $DIR/issue-83929-impl-trait-in-generic-default.rs:4:20
    |
 LL | type Result<T, E = impl std::error::Error> = std::result::Result<T, E>;
diff --git a/tests/ui/impl-trait/issues/issue-84919.rs b/tests/ui/impl-trait/issues/issue-84919.rs
@@ -3,7 +3,7 @@ impl Trait for () {}
 
 fn foo<'a: 'a>() {
     let _x: impl Trait = ();
-    //~^ `impl Trait` only allowed in function and inherent method return types
+    //~^ `impl Trait` only allowed in function and inherent method argument and return types
 }
 
 fn main() {}
diff --git a/tests/ui/impl-trait/issues/issue-84919.stderr b/tests/ui/impl-trait/issues/issue-84919.stderr
@@ -1,4 +1,4 @@
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in variable bindings
   --> $DIR/issue-84919.rs:5:13
    |
 LL |     let _x: impl Trait = ();
diff --git a/tests/ui/impl-trait/issues/issue-86642.rs b/tests/ui/impl-trait/issues/issue-86642.rs
@@ -1,5 +1,5 @@
 static x: impl Fn(&str) -> Result<&str, ()> = move |source| {
-    //~^ `impl Trait` only allowed in function and inherent method return types
+    //~^ `impl Trait` only allowed in function and inherent method argument and return types
     let res = (move |source| Ok(source))(source);
     let res = res.or((move |source| Ok(source))(source));
     res
diff --git a/tests/ui/impl-trait/issues/issue-86642.stderr b/tests/ui/impl-trait/issues/issue-86642.stderr
@@ -1,4 +1,4 @@
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in const types
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in const types
   --> $DIR/issue-86642.rs:1:11
    |
 LL | static x: impl Fn(&str) -> Result<&str, ()> = move |source| {
diff --git a/tests/ui/impl-trait/issues/issue-87295.rs b/tests/ui/impl-trait/issues/issue-87295.rs
@@ -14,5 +14,5 @@ impl<F> Struct<F> {
 
 fn main() {
     let _do_not_waste: Struct<impl Trait<Output = i32>> = Struct::new(());
-    //~^ `impl Trait` only allowed in function and inherent method return types
+    //~^ `impl Trait` only allowed in function and inherent method argument and return types
 }
diff --git a/tests/ui/impl-trait/issues/issue-87295.stderr b/tests/ui/impl-trait/issues/issue-87295.stderr
@@ -1,4 +1,4 @@
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in variable bindings
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in variable bindings
   --> $DIR/issue-87295.rs:16:31
    |
 LL |     let _do_not_waste: Struct<impl Trait<Output = i32>> = Struct::new(());
diff --git a/tests/ui/impl-trait/nested_impl_trait.rs b/tests/ui/impl-trait/nested_impl_trait.rs
@@ -9,7 +9,7 @@ fn bad_in_ret_position(x: impl Into<u32>) -> impl Into<impl Debug> { x }
 
 fn bad_in_fn_syntax(x: fn() -> impl Into<impl Debug>) {}
 //~^ ERROR nested `impl Trait` is not allowed
-//~| `impl Trait` only allowed in function and inherent method return types
+//~| `impl Trait` only allowed in function and inherent method argument and return types
 
 fn bad_in_arg_position(_: impl Into<impl Debug>) { }
 //~^ ERROR nested `impl Trait` is not allowed
diff --git a/tests/ui/impl-trait/nested_impl_trait.stderr b/tests/ui/impl-trait/nested_impl_trait.stderr
@@ -34,7 +34,7 @@ LL |     fn bad(x: impl Into<u32>) -> impl Into<impl Debug> { x }
    |                                  |         nested `impl Trait` here
    |                                  outer `impl Trait`
 
-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `fn` pointer return types
+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in `fn` pointer return types
   --> $DIR/nested_impl_trait.rs:10:32
    |
 LL | fn bad_in_fn_syntax(x: fn() -> impl Into<impl Debug>) {}
diff --git a/tests/ui/impl-trait/where-allowed.rs b/tests/ui/impl-trait/where-allowed.rs
diff --git a/tests/ui/impl-trait/where-allowed.stderr b/tests/ui/impl-trait/where-allowed.stderr
diff --git a/tests/ui/issues/issue-47715.rs b/tests/ui/issues/issue-47715.rs
diff --git a/tests/ui/issues/issue-47715.stderr b/tests/ui/issues/issue-47715.stderr
diff --git a/tests/ui/type-alias-impl-trait/type-alias-impl-trait-fn-type.rs b/tests/ui/type-alias-impl-trait/type-alias-impl-trait-fn-type.rs
diff --git a/tests/ui/type-alias-impl-trait/type-alias-impl-trait-fn-type.stderr b/tests/ui/type-alias-impl-trait/type-alias-impl-trait-fn-type.stderr
diff --git a/tests/ui/typeck/issue-104513-ice.rs b/tests/ui/typeck/issue-104513-ice.rs
diff --git a/tests/ui/typeck/issue-104513-ice.stderr b/tests/ui/typeck/issue-104513-ice.stderr

Original file line number	Diff line number	Diff line change
`@@ -33,7 +33,7 @@ LL \| fn main<A: TraitWAssocConst<A=32>>() {`
`33`	`33`	`= note: see issue #92827 <https://github.com/rust-lang/rust/issues/92827> for more information`
`34`	`34`	= help: add `#![feature(associated_const_equality)]` to the crate attributes to enable
`35`	`35`
`36`		-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in impl headers
	`36`	+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in impl headers
`37`	`37`	`--> $DIR/issue-105330.rs:6:27`
`38`	`38`	`\|`
`39`	`39`	`LL \| impl TraitWAssocConst for impl Demo {`
Original file line number	Diff line number	Diff line change
`@@ -11,7 +11,7 @@ trait MyTrait {`
`11`	`11`
`12`	`12`	`impl MyTrait for i32 {`
`13`	`13`	`fn foo(&self) -> impl Future<Output = i32> {`
`14`		- //~^ ERROR `impl Trait` only allowed in function and inherent method return types, not in `impl` method return types
	`14`	+ //~^ ERROR `impl Trait` only allowed in function and inherent method argument and return types, not in `impl` method return types
`15`	`15`	`async { *self }`
`16`	`16`	`}`
`17`	`17`	`}`
Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		-error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `impl` method return types
	`1`	+error[E0562]: `impl Trait` only allowed in function and inherent method argument and return types, not in `impl` method return types
`2`	`2`	`--> $DIR/fn-not-async-err2.rs:13:22`
`3`	`3`	`\|`
`4`	`4`	`LL \| fn foo(&self) -> impl Future<Output = i32> {`