error[E0401]: can't use generic parameters from outer function --> $DIR/issue-5997-struct.rs:2:14 | LL | fn f() -> bool { | - - type parameter from outer function | | | try adding a local generic parameter in this method instead LL | struct S(T); | ^ use of generic parameter from outer function error: aborting due to previous error For more information about this error, try `rustc --explain E0401`.