error: return types are denoted using `->` --> $DIR/fn-recover-return-sign2.rs:4:10 | LL | fn foo() => impl Fn() => bool { | ^^ help: use `->` instead error: expected one of `+`, `->`, `::`, `where`, or `{`, found `=>` --> $DIR/fn-recover-return-sign2.rs:4:23 | LL | fn foo() => impl Fn() => bool { | ^^ expected one of `+`, `->`, `::`, `where`, or `{` error: aborting due to 2 previous errors