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error[E0308]: mismatched types
--> $DIR/expected-boxed-future-isnt-pinned.rs:11:5
|
LL | fn foo<F: Future<Output=i32> + Send + 'static>(x: F) -> BoxFuture<'static, i32> {
| - this type parameter ----------------------- expected `Pin<Box<(dyn Future<Output = i32> + 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 `Pin`, found type parameter `F`
|
= note: expected struct `Pin<Box<(dyn Future<Output = i32> + 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<F: Future<Output=i32> + Send + 'static>(x: F) -> BoxFuture<'static, i32> {
| ----------------------- expected `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>` because of return type
LL | Box::new(x)
| ^^^^^^^^^^^ expected struct `Pin`, found struct `Box`
|
= note: expected struct `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>`
found struct `Box<F>`
= help: use `Box::pin`
error[E0308]: mismatched types
--> $DIR/expected-boxed-future-isnt-pinned.rs:19:14
|
LL | fn baz<F: Future<Output=i32> + Send + 'static>(x: F) -> BoxFuture<'static, i32> {
| - this type parameter
LL | Pin::new(x)
| -------- ^ expected struct `Box`, 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<dyn Future<Output = i32> + Send>`
found type parameter `F`
note: associated function defined here
--> $SRC_DIR/core/src/pin.rs:LL:COL
error[E0277]: `dyn Future<Output = i32> + 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<Output = i32> + Send`
| |
| required by a bound introduced by this call
|
= note: consider using `Box::pin`
note: required by a bound in `Pin::<P>::new`
--> $SRC_DIR/core/src/pin.rs:LL:COL
error[E0277]: `dyn Future<Output = i32> + 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<Output = i32> + Send`
| |
| required by a bound introduced by this call
|
= note: consider using `Box::pin`
note: required by a bound in `Pin::<P>::new`
--> $SRC_DIR/core/src/pin.rs:LL:COL
error[E0308]: mismatched types
--> $DIR/expected-boxed-future-isnt-pinned.rs:28:5
|
LL | / async {
LL | | 42
LL | | }
| | ^
| | |
| |_____expected struct `Pin`, found `async` block
| arguments to this function are incorrect
|
= note: expected struct `Pin<Box<dyn Future<Output = i32> + Send>>`
found `async` block `[async block@$DIR/expected-boxed-future-isnt-pinned.rs:28:5: 30:6]`
note: function defined here
--> $SRC_DIR/core/src/future/mod.rs:LL:COL
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`.
|
