src/test/ui/issues/issue-59494.stderr

   1 error[E0277]: expected a `Fn<(_,)>` closure, found `impl Fn<(((_, _), _),)>`
   2   --> $DIR/issue-59494.rs:21:22
   3    |
   4 LL |     let t8 = t8n(t7, t7p(f, g));
   5    |                      ^^^^^^^^^ expected an `Fn<(_,)>` closure, found `impl Fn<(((_, _), _),)>`
   6    |
   7    = help: the trait `Fn<(_,)>` is not implemented for `impl Fn<(((_, _), _),)>`
   8 note: required by a bound in `t8n`
   9   --> $DIR/issue-59494.rs:5:45
  10    |
  11 LL | fn t8n<A, B, C>(f: impl Fn(A) -> B, g: impl Fn(A) -> C) -> impl Fn(A) -> (B, C)
  12    |                                             ^^^^^^^^^^ required by this bound in `t8n`
  13
  14 error: aborting due to previous error
  15
  16 For more information about this error, try `rustc --explain E0277`.