error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types
  --> $DIR/suggest-return-future.rs:7:13
   |
LL | fn foo() -> _ {
   |             ^ not allowed in type signatures
   |
help: replace with an appropriate return type
   |
LL - fn foo() -> _ {
LL + fn foo() -> impl Future<Output = i32> {
   |

error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types
  --> $DIR/suggest-return-future.rs:15:13
   |
LL | fn bar() -> _ {
   |             ^ not allowed in type signatures
   |
help: replace with an appropriate return type
   |
LL - fn bar() -> _ {
LL + fn bar() -> impl Future<Output = i32> {
   |

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0121`.