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 | arguments to this function are incorrect
38 | help: use `Box::pin` to pin and box this expression: `Box::pin`
40 = note: expected struct `Box<dyn Future<Output = i32> + Send>`
41 found type parameter `F`
42 note: associated function defined here
43 --> $SRC_DIR/core/src/pin.rs:LL:COL
45 LL | pub const fn new(pointer: P) -> Pin<P> {
48 error[E0277]: `dyn Future<Output = i32> + Send` cannot be unpinned
49 --> $DIR/expected-boxed-future-isnt-pinned.rs:19:5
52 | ^^^^^^^^ the trait `Unpin` is not implemented for `dyn Future<Output = i32> + Send`
54 = note: consider using `Box::pin`
55 note: required by a bound in `Pin::<P>::new`
56 --> $SRC_DIR/core/src/pin.rs:LL:COL
58 LL | impl<P: Deref<Target: Unpin>> Pin<P> {
59 | ^^^^^ required by this bound in `Pin::<P>::new`
61 error[E0277]: `dyn Future<Output = i32> + Send` cannot be unpinned
62 --> $DIR/expected-boxed-future-isnt-pinned.rs:24:5
64 LL | Pin::new(Box::new(x))
65 | ^^^^^^^^ the trait `Unpin` is not implemented for `dyn Future<Output = i32> + Send`
67 = note: consider using `Box::pin`
68 note: required by a bound in `Pin::<P>::new`
69 --> $SRC_DIR/core/src/pin.rs:LL:COL
71 LL | impl<P: Deref<Target: Unpin>> Pin<P> {
72 | ^^^^^ required by this bound in `Pin::<P>::new`
74 error[E0308]: mismatched types
75 --> $DIR/expected-boxed-future-isnt-pinned.rs:28:5
77 LL | fn zap() -> BoxFuture<'static, i32> {
78 | ----------------------- expected `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>` because of return type
82 | |_____^ expected struct `Pin`, found opaque type
84 ::: $SRC_DIR/core/src/future/mod.rs:LL:COL
86 LL | pub const fn from_generator<T>(gen: T) -> impl Future<Output = T::Return>
87 | ------------------------------- the found opaque type
89 = note: expected struct `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>`
90 found opaque type `impl Future`
91 help: you need to pin and box this expression
98 error: aborting due to 6 previous errors
100 Some errors have detailed explanations: E0277, E0308.
101 For more information about an error, try `rustc --explain E0277`.