error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types
  --> $DIR/return-cycle.rs:6:17
   |
LL |     fn new() -> _ {
   |                 ^
   |                 |
   |                 not allowed in type signatures
   |                 help: replace with the correct return type: `Token<()>`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0121`.