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 {
5 | ^^^^^^^^ only `Fn` traits may use parentheses
7 help: use angle brackets instead
9 LL | pub extern fn foo(_: Vec<u32>) -> u32 {
12 error: aborting due to previous error
14 For more information about this error, try `rustc --explain E0214`.