src/test/ui/unboxed-closures/issue-30906.stderr

   1 error: implementation of `FnOnce` is not general enough
   2   --> $DIR/issue-30906.rs:18:5
   3    |
   4 LL |     test(Compose(f, |_| {}));
   5    |     ^^^^^^^^^^^^^^^^^^^^^^^^ implementation of `FnOnce` is not general enough
   6    |
   7    = note: `fn(&'2 str) -> T` must implement `FnOnce<(&'1 str,)>`, for any lifetime `'1`...
   8    = note: ...but it actually implements `FnOnce<(&'2 str,)>`, for some specific lifetime `'2`
   9
  10 error: aborting due to previous error
  11