tests/ui/suggestions/expected-boxed-future-isnt-pinned.stderr

   1 error[E0308]: mismatched types
   2   --> $DIR/expected-boxed-future-isnt-pinned.rs:11:5
   3    |
   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.
   7 LL |     x
   8    |     ^ expected struct `Pin`, found type parameter `F`
   9    |
  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
  13    |
  14 LL |     Box::pin(x)
  15    |     +++++++++ +
  16
  17 error[E0308]: mismatched types
  18   --> $DIR/expected-boxed-future-isnt-pinned.rs:15:5
  19    |
  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
  22 LL |     Box::new(x)
  23    |     ^^^^^^^^^^^ expected struct `Pin`, found struct `Box`
  24    |
  25    = note: expected struct `Pin<Box<(dyn Future<Output = i32> + Send + 'static)>>`
  26               found struct `Box<F>`
  27    = help: use `Box::pin`
  28
  29 error[E0308]: mismatched types
  30   --> $DIR/expected-boxed-future-isnt-pinned.rs:19:14
  31    |
  32 LL | fn baz<F: Future<Output=i32> + Send + 'static>(x: F) -> BoxFuture<'static, i32> {
  33    |        - this type parameter
  34 LL |     Pin::new(x)
  35    |     -------- ^ expected struct `Box`, found type parameter `F`
  36    |     |
  37    |     arguments to this function are incorrect
  38    |     help: use `Box::pin` to pin and box this expression: `Box::pin`
  39    |
  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
  44
  45 error[E0277]: `dyn Future<Output = i32> + Send` cannot be unpinned
  46   --> $DIR/expected-boxed-future-isnt-pinned.rs:19:14
  47    |
  48 LL |     Pin::new(x)
  49    |     -------- ^ the trait `Unpin` is not implemented for `dyn Future<Output = i32> + Send`
  50    |     |
  51    |     required by a bound introduced by this call
  52    |
  53    = note: consider using `Box::pin`
  54 note: required by a bound in `Pin::<P>::new`
  55   --> $SRC_DIR/core/src/pin.rs:LL:COL
  56
  57 error[E0277]: `dyn Future<Output = i32> + Send` cannot be unpinned
  58   --> $DIR/expected-boxed-future-isnt-pinned.rs:24:14
  59    |
  60 LL |     Pin::new(Box::new(x))
  61    |     -------- ^^^^^^^^^^^ the trait `Unpin` is not implemented for `dyn Future<Output = i32> + Send`
  62    |     |
  63    |     required by a bound introduced by this call
  64    |
  65    = note: consider using `Box::pin`
  66 note: required by a bound in `Pin::<P>::new`
  67   --> $SRC_DIR/core/src/pin.rs:LL:COL
  68
  69 error[E0308]: mismatched types
  70   --> $DIR/expected-boxed-future-isnt-pinned.rs:28:5
  71    |
  72 LL | /     async {
  73 LL | |         42
  74 LL | |     }
  75    | |     ^
  76    | |     |
  77    | |_____expected struct `Pin`, found `async` block
  78    |       arguments to this function are incorrect
  79    |
  80    = note:     expected struct `Pin<Box<dyn Future<Output = i32> + Send>>`
  81            found `async` block `[async block@$DIR/expected-boxed-future-isnt-pinned.rs:28:5: 30:6]`
  82 note: function defined here
  83   --> $SRC_DIR/core/src/future/mod.rs:LL:COL
  84 help: you need to pin and box this expression
  85    |
  86 LL ~     Box::pin(async {
  87 LL |         42
  88 LL ~     })
  89    |
  90
  91 error: aborting due to 6 previous errors
  92
  93 Some errors have detailed explanations: E0277, E0308.
  94 For more information about an error, try `rustc --explain E0277`.