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