error[E0308]: mismatched types --> $DIR/issue-35241.rs:3:20 | LL | struct Foo(u32); | ---------- fn(u32) -> Foo {Foo} defined here LL | LL | fn test() -> Foo { Foo } | --- ^^^ expected struct `Foo`, found fn item | | | expected `Foo` because of return type | = note: expected struct `Foo` found fn item `fn(u32) -> Foo {Foo}` help: use parentheses to instantiate this tuple struct | LL | fn test() -> Foo { Foo(_) } | +++ error: aborting due to previous error For more information about this error, try `rustc --explain E0308`.