1 error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types
2 --> $DIR/return-cycle-2.rs:6:34
4 LL | fn as_ref(_: i32, _: i32) -> _ {
7 | not allowed in type signatures
8 | help: replace with the correct return type: `Token<&'static T>`
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0121`.