1 warning: the feature `unsized_locals` is incomplete and may not be safe to use and/or cause compiler crashes
2 --> $DIR/issue-50940-with-feature.rs:1:12
4 LL | #![feature(unsized_locals, unsized_fn_params)]
7 = note: see issue #48055 <https://github.com/rust-lang/rust/issues/48055> for more information
8 = note: `#[warn(incomplete_features)]` on by default
10 error[E0277]: the size for values of type `str` cannot be known at compilation time
11 --> $DIR/issue-50940-with-feature.rs:6:5
13 LL | A as fn(str) -> A<str>;
14 | ^ doesn't have a size known at compile-time
16 = help: within `A<str>`, the trait `Sized` is not implemented for `str`
17 note: required because it appears within the type `A<str>`
18 --> $DIR/issue-50940-with-feature.rs:5:12
20 LL | struct A<X: ?Sized>(X);
22 = note: the return type of a function must have a statically known size
24 error: aborting due to previous error; 1 warning emitted
26 For more information about this error, try `rustc --explain E0277`.