1 error[E0308]: mismatched types
2 --> $DIR/expected-boxed-future-isnt-pinned.rs:11:5
4 LL | fn foo<F: Future<Output=i32> + Send + 'static>(x: F) -> BoxFuture<'static, i32> {
5 | - this type parameter ----------------------- expected `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>` because of return type
6 LL | // We could instead use an `async` block, but this way we have no std spans.
8 | ^ expected struct `Pin`, found type parameter `F`
10 = note: expected struct `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>`
11 found type parameter `F`
12 help: you need to pin and box this expression
17 error[E0308]: mismatched types
18 --> $DIR/expected-boxed-future-isnt-pinned.rs:15:5
20 LL | fn bar<F: Future<Output=i32> + Send + 'static>(x: F) -> BoxFuture<'static, i32> {
21 | ----------------------- expected `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>` because of return type
23 | ^^^^^^^^^^^ expected struct `Pin`, found struct `Box`
25 = note: expected struct `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>`
27 = help: use `Box::pin`
29 error[E0308]: mismatched types
30 --> $DIR/expected-boxed-future-isnt-pinned.rs:19:14
32 LL | fn baz<F: Future<Output=i32> + Send + 'static>(x: F) -> BoxFuture<'static, i32> {
33 | - this type parameter
35 | -------- ^ expected struct `Box`, found type parameter `F`
37 | help: use `Box::pin` to pin and box this expression: `Box::pin`
39 = note: expected struct `Box<dyn Future<Output = i32> + Send>`
40 found type parameter `F`
42 error[E0277]: `dyn Future<Output = i32> + Send` cannot be unpinned
43 --> $DIR/expected-boxed-future-isnt-pinned.rs:19:5
46 | ^^^^^^^^ the trait `Unpin` is not implemented for `dyn Future<Output = i32> + Send`
48 = note: consider using `Box::pin`
49 note: required by a bound in `Pin::<P>::new`
50 --> $SRC_DIR/core/src/pin.rs:LL:COL
52 LL | impl<P: Deref<Target: Unpin>> Pin<P> {
53 | ^^^^^ required by this bound in `Pin::<P>::new`
55 error[E0277]: `dyn Future<Output = i32> + Send` cannot be unpinned
56 --> $DIR/expected-boxed-future-isnt-pinned.rs:24:5
58 LL | Pin::new(Box::new(x))
59 | ^^^^^^^^ the trait `Unpin` is not implemented for `dyn Future<Output = i32> + Send`
61 = note: consider using `Box::pin`
62 note: required by a bound in `Pin::<P>::new`
63 --> $SRC_DIR/core/src/pin.rs:LL:COL
65 LL | impl<P: Deref<Target: Unpin>> Pin<P> {
66 | ^^^^^ required by this bound in `Pin::<P>::new`
68 error[E0308]: mismatched types
69 --> $DIR/expected-boxed-future-isnt-pinned.rs:28:5
71 LL | fn zap() -> BoxFuture<'static, i32> {
72 | ----------------------- expected `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>` because of return type
76 | |_____^ expected struct `Pin`, found opaque type
78 ::: $SRC_DIR/core/src/future/mod.rs:LL:COL
80 LL | pub const fn from_generator<T>(gen: T) -> impl Future<Output = T::Return>
81 | ------------------------------- the found opaque type
83 = note: expected struct `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>`
84 found opaque type `impl Future<Output = [async output]>`
85 help: you need to pin and box this expression
92 error: aborting due to 6 previous errors
94 Some errors have detailed explanations: E0277, E0308.
95 For more information about an error, try `rustc --explain E0277`.