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add a test for gate impl_trait_in_fn_trait_return

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Maybe Waffle 2022-07-29 02:28:36 +04:00
parent d116859ad7
commit 690e037008
2 changed files with 21 additions and 0 deletions
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6
src/test/ui/feature-gates/feature-gate-impl_trait_in_fn_trait_return.rs Normal file
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fn f() -> impl Fn() -> impl Sized { || () }
//~^ ERROR `impl Trait` only allowed in function and inherent method 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
fn main() {}

15
src/test/ui/feature-gates/feature-gate-impl_trait_in_fn_trait_return.stderr Normal file
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error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return
--> $DIR/feature-gate-impl_trait_in_fn_trait_return.rs:1:24
|
LL | fn f() -> impl Fn() -> impl Sized { || () }
| ^^^^^^^^^^
error[E0562]: `impl Trait` only allowed in function and inherent method return types, not in `Fn` trait return
--> $DIR/feature-gate-impl_trait_in_fn_trait_return.rs:3:32
|
LL | fn g() -> &'static dyn Fn() -> impl Sized { &|| () }
| ^^^^^^^^^^
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0562`.