error[E0308]: mismatched types --> $DIR/expected-boxed-future-isnt-pinned.rs:11:5 | LL | fn foo + Send + 'static>(x: F) -> BoxFuture<'static, i32> { | - this type parameter ----------------------- expected `Pin + 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 `Pin>`, found type parameter `F` | = note: expected struct `Pin + Send + 'static)>>` found type parameter `F` help: you need to pin and box this expression | LL | Box::pin(x) | +++++++++ + error[E0308]: mismatched types --> $DIR/expected-boxed-future-isnt-pinned.rs:15:5 | LL | fn bar + Send + 'static>(x: F) -> BoxFuture<'static, i32> { | ----------------------- expected `Pin + Send + 'static)>>` because of return type LL | Box::new(x) | ^^^^^^^^^^^ expected `Pin>`, found `Box` | = note: expected struct `Pin + Send + 'static)>>` found struct `Box` = help: use `Box::pin` error[E0308]: mismatched types --> $DIR/expected-boxed-future-isnt-pinned.rs:19:14 | LL | fn baz + Send + 'static>(x: F) -> BoxFuture<'static, i32> { | - this type parameter LL | Pin::new(x) | -------- ^ expected `Box + Send>`, found type parameter `F` | | | arguments to this function are incorrect | help: use `Box::pin` to pin and box this expression: `Box::pin` | = note: expected struct `Box + Send>` found type parameter `F` note: associated function defined here --> $SRC_DIR/core/src/pin.rs:LL:COL error[E0277]: `dyn Future + Send` cannot be unpinned --> $DIR/expected-boxed-future-isnt-pinned.rs:19:14 | LL | Pin::new(x) | -------- ^ the trait `Unpin` is not implemented for `dyn Future + Send` | | | required by a bound introduced by this call | = note: consider using the `pin!` macro consider using `Box::pin` if you need to access the pinned value outside of the current scope note: required by a bound in `Pin::

::new` --> $SRC_DIR/core/src/pin.rs:LL:COL error[E0277]: `dyn Future + Send` cannot be unpinned --> $DIR/expected-boxed-future-isnt-pinned.rs:24:14 | LL | Pin::new(Box::new(x)) | -------- ^^^^^^^^^^^ the trait `Unpin` is not implemented for `dyn Future + Send` | | | required by a bound introduced by this call | = note: consider using the `pin!` macro consider using `Box::pin` if you need to access the pinned value outside of the current scope note: required by a bound in `Pin::

::new` --> $SRC_DIR/core/src/pin.rs:LL:COL error[E0308]: mismatched types --> $DIR/expected-boxed-future-isnt-pinned.rs:28:5 | LL | fn zap() -> BoxFuture<'static, i32> { | ----------------------- expected `Pin + Send + 'static)>>` because of return type LL | / async { LL | | 42 LL | | } | |_____^ expected `Pin>`, found `async` block | = note: expected struct `Pin + Send + 'static)>>` found `async` block `[async block@$DIR/expected-boxed-future-isnt-pinned.rs:28:5: 30:6]` help: you need to pin and box this expression | LL ~ Box::pin(async { LL | 42 LL ~ }) | error: aborting due to 6 previous errors Some errors have detailed explanations: E0277, E0308. For more information about an error, try `rustc --explain E0277`.