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error[E0277]: expected a `Fn(_)` closure, found `impl Fn(((_, _), _))`
  --> $DIR/issue-59494.rs:21:22
   |
LL |     let t8 = t8n(t7, t7p(f, g));
   |              ---     ^^^^^^^^^ expected an `Fn(_)` closure, found `impl Fn(((_, _), _))`
   |              |
   |              required by a bound introduced by this call
   |
   = help: the trait `Fn<(_,)>` is not implemented for `impl Fn(((_, _), _))`
note: required by a bound in `t8n`
  --> $DIR/issue-59494.rs:5:45
   |
LL | fn t8n<A, B, C>(f: impl Fn(A) -> B, g: impl Fn(A) -> C) -> impl Fn(A) -> (B, C)
   |                                             ^^^^^^^^^^ required by this bound in `t8n`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.