error[E0277]: the size for values of type `str` cannot be known at compilation time
  --> $DIR/sized-yield.rs:8:19
   |
LL |       let mut gen = move || {
   |  ___________________^
LL | |
LL | |         yield s[..];
LL | |     };
   | |_____^ doesn't have a size known at compile-time
   |
   = help: the trait `Sized` is not implemented for `str`
   = note: the yield type of a coroutine must have a statically known size

error[E0277]: the size for values of type `str` cannot be known at compilation time
  --> $DIR/sized-yield.rs:12:24
   |
LL |     Pin::new(&mut gen).resume(());
   |                        ^^^^^^ doesn't have a size known at compile-time
   |
   = help: the trait `Sized` is not implemented for `str`
note: required by an implicit `Sized` bound in `CoroutineState`
  --> $SRC_DIR/core/src/ops/coroutine.rs:LL:COL

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0277`.