mirror of https://github.com/rust-lang/rust
94 lines
3.8 KiB
Plaintext
94 lines
3.8 KiB
Plaintext
error[E0308]: mismatched types
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--> $DIR/expected-boxed-future-isnt-pinned.rs:11:5
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LL | fn foo<F: Future<Output=i32> + Send + 'static>(x: F) -> BoxFuture<'static, i32> {
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| - found this type parameter ----------------------- expected `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>` because of return type
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LL | // We could instead use an `async` block, but this way we have no std spans.
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LL | x
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| ^ expected `Pin<Box<...>>`, found type parameter `F`
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= note: expected struct `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>`
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found type parameter `F`
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help: you need to pin and box this expression
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LL | Box::pin(x)
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| +++++++++ +
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error[E0308]: mismatched types
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--> $DIR/expected-boxed-future-isnt-pinned.rs:15:5
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LL | fn bar<F: Future<Output=i32> + Send + 'static>(x: F) -> BoxFuture<'static, i32> {
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| ----------------------- expected `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>` because of return type
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LL | Box::new(x)
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| ^^^^^^^^^^^ expected `Pin<Box<...>>`, found `Box<F>`
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= note: expected struct `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>`
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found struct `Box<F>`
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= help: use `Box::pin`
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error[E0308]: mismatched types
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--> $DIR/expected-boxed-future-isnt-pinned.rs:19:14
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LL | fn baz<F: Future<Output=i32> + Send + 'static>(x: F) -> BoxFuture<'static, i32> {
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| - found this type parameter
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LL | Pin::new(x)
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| -------- ^ expected `Box<dyn Future<Output = ...> + Send>`, found type parameter `F`
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| |
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| arguments to this function are incorrect
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| help: use `Box::pin` to pin and box this expression: `Box::pin`
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= note: expected struct `Box<dyn Future<Output = i32> + Send>`
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found type parameter `F`
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note: associated function defined here
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--> $SRC_DIR/core/src/pin.rs:LL:COL
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error[E0277]: `dyn Future<Output = i32> + Send` cannot be unpinned
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--> $DIR/expected-boxed-future-isnt-pinned.rs:19:14
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LL | Pin::new(x)
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| -------- ^ the trait `Unpin` is not implemented for `dyn Future<Output = i32> + Send`
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| |
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| required by a bound introduced by this call
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= note: consider using the `pin!` macro
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consider using `Box::pin` if you need to access the pinned value outside of the current scope
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note: required by a bound in `Pin::<Ptr>::new`
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--> $SRC_DIR/core/src/pin.rs:LL:COL
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error[E0277]: `dyn Future<Output = i32> + Send` cannot be unpinned
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--> $DIR/expected-boxed-future-isnt-pinned.rs:24:14
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LL | Pin::new(Box::new(x))
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| -------- ^^^^^^^^^^^ the trait `Unpin` is not implemented for `dyn Future<Output = i32> + Send`
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| |
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| required by a bound introduced by this call
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= note: consider using the `pin!` macro
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consider using `Box::pin` if you need to access the pinned value outside of the current scope
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note: required by a bound in `Pin::<Ptr>::new`
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--> $SRC_DIR/core/src/pin.rs:LL:COL
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error[E0308]: mismatched types
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--> $DIR/expected-boxed-future-isnt-pinned.rs:28:5
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LL | fn zap() -> BoxFuture<'static, i32> {
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| ----------------------- expected `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>` because of return type
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LL | / async {
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LL | | 42
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LL | | }
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| |_____^ expected `Pin<Box<...>>`, found `async` block
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= note: expected struct `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>`
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found `async` block `{async block@$DIR/expected-boxed-future-isnt-pinned.rs:28:5: 30:6}`
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help: you need to pin and box this expression
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LL ~ Box::pin(async {
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LL | 42
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LL ~ })
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error: aborting due to 6 previous errors
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Some errors have detailed explanations: E0277, E0308.
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For more information about an error, try `rustc --explain E0277`.
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