error: expected identifier, found keyword `fn` --> $DIR/recover-fn-trait-from-fn-kw.rs:1:16 | LL | fn foo(_: impl fn() -> i32) {} | ^^ | help: use `Fn` to refer to the trait (notice the capitalization difference) | LL | fn foo(_: impl Fn() -> i32) {} | ~~ error: expected identifier, found keyword `fn` --> $DIR/recover-fn-trait-from-fn-kw.rs:4:12 | LL | fn foo2(_: T) {} | ^^ | help: use `Fn` to refer to the trait (notice the capitalization difference) | LL | fn foo2(_: T) {} | ~~ error[E0308]: mismatched types --> $DIR/recover-fn-trait-from-fn-kw.rs:8:12 | LL | foo(|| ()); | ^^ expected `i32`, found `()` error[E0631]: type mismatch in closure arguments --> $DIR/recover-fn-trait-from-fn-kw.rs:10:5 | LL | foo2(|_: ()| {}); | ^^^^^-------^^^^ | | | | | found signature defined here | expected due to this | = note: expected closure signature `fn(i32) -> _` found closure signature `fn(()) -> _` note: required by a bound in `foo2` --> $DIR/recover-fn-trait-from-fn-kw.rs:4:12 | LL | fn foo2(_: T) {} | ^^^^^^^ required by this bound in `foo2` error: aborting due to 4 previous errors Some errors have detailed explanations: E0308, E0631. For more information about an error, try `rustc --explain E0308`.