error[E0401]: can't use type parameters from outer function --> $DIR/issue-5997-enum.rs:12:16 | LL | fn f() -> bool { | - - type variable from outer function | | | try adding a local type parameter in this method instead LL | enum E { V(Z) } | ^ use of type variable from outer function error: aborting due to previous error For more information about this error, try `rustc --explain E0401`.