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
   |
LL -     fn new() -> _ {
LL +     fn new() -> Token<()> {
   |

error: aborting due to 1 previous error

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