error: expected one of `(`, `::`, `<`, or `>`, found `;`
  --> $DIR/ice-const-generic-function-return-ty.rs:2:46
   |
LL | fn return_ty() -> impl Into<<() as Reexported;
   |                                              ^ expected one of `(`, `::`, `<`, or `>`

error: aborting due to previous error