src/test/ui/fn/fn-trait-formatting.stderr

   1 error[E0308]: mismatched types
   2   --> $DIR/fn-trait-formatting.rs:6:17
   3    |
   4 LL |     let _: () = (box |_: isize| {}) as Box<dyn FnOnce(isize)>;
   5    |            --   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found struct `Box`
   6    |            |
   7    |            expected due to this
   8    |
   9    = note: expected unit type `()`
  10                  found struct `Box<dyn FnOnce(isize)>`
  11
  12 error[E0308]: mismatched types
  13   --> $DIR/fn-trait-formatting.rs:10:17
  14    |
  15 LL |     let _: () = (box |_: isize, isize| {}) as Box<dyn Fn(isize, isize)>;
  16    |            --   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found struct `Box`
  17    |            |
  18    |            expected due to this
  19    |
  20    = note: expected unit type `()`
  21                  found struct `Box<dyn Fn(isize, isize)>`
  22
  23 error[E0308]: mismatched types
  24   --> $DIR/fn-trait-formatting.rs:14:17
  25    |
  26 LL |     let _: () = (box || -> isize { unimplemented!() }) as Box<dyn FnMut() -> isize>;
  27    |            --   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found struct `Box`
  28    |            |
  29    |            expected due to this
  30    |
  31    = note: expected unit type `()`
  32                  found struct `Box<dyn FnMut() -> isize>`
  33
  34 error[E0277]: expected a `Fn<(isize,)>` closure, found `{integer}`
  35   --> $DIR/fn-trait-formatting.rs:19:14
  36    |
  37 LL | fn needs_fn<F>(x: F) where F: Fn(isize) -> isize {}
  38    |                               ------------------ required by this bound in `needs_fn`
  39 ...
  40 LL |     needs_fn(1);
  41    |              ^ expected an `Fn<(isize,)>` closure, found `{integer}`
  42    |
  43    = help: the trait `Fn<(isize,)>` is not implemented for `{integer}`
  44
  45 error: aborting due to 4 previous errors
  46
  47 Some errors have detailed explanations: E0277, E0308.
  48 For more information about an error, try `rustc --explain E0277`.