rust/src/test/ui/suggestions/expected-boxed-future-isnt-pinned.stderr

error[E0308]: mismatched types
  --> $DIR/expected-boxed-future-isnt-pinned.rs:12:5
   |
LL | fn foo<F: Future<Output=i32> + Send + 'static>(x: F) -> BoxFuture<'static, i32> {
   |        - this type parameter                            ----------------------- expected `std::pin::Pin<std::boxed::Box<(dyn std::future::Future<Output = i32> + std::marker::Send + 'static)>>` because of return type
LL |     // We could instead use an `async` block, but this way we have no std spans.
LL |     x
   |     ^
   |     |
   |     expected struct `std::pin::Pin`, found type parameter `F`
   |     help: you need to pin and box this expression: `Box::pin(x)`
   |
   = note:      expected struct `std::pin::Pin<std::boxed::Box<(dyn std::future::Future<Output = i32> + std::marker::Send + 'static)>>`
           found type parameter `F`
   = help: type parameters must be constrained to match other types
   = note: for more information, visit https://doc.rust-lang.org/book/ch10-02-traits.html#traits-as-parameters

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.