src/test/ui/issues/issue-51154.stderr

   1 error[E0308]: mismatched types
   2   --> $DIR/issue-51154.rs:2:30
   3    |
   4 LL | fn foo<F: FnMut()>() {
   5    |        - this type parameter
   6 LL |     let _: Box<F> = Box::new(|| ());
   7    |                              ^^^^^ expected type parameter `F`, found closure
   8    |
   9    = note: expected type parameter `F`
  10                      found closure `[closure@$DIR/issue-51154.rs:2:30: 2:35]`
  11    = help: every closure has a distinct type and so could not always match the caller-chosen type of parameter `F`
  12
  13 error: aborting due to previous error
  14
  15 For more information about this error, try `rustc --explain E0308`.