1 error[E0214]: parenthesized type parameters may only be used with a `Fn` trait
2 --> $DIR/issue-66286.rs:8:22
4 LL | pub extern fn foo(_: Vec(u32)) -> u32 {
7 | only `Fn` traits may use parentheses
8 | help: use angle brackets instead: `Vec<u32>`
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0214`.