error[E0121]: the placeholder `_` is not allowed within types on item signatures for constant items --> $DIR/invalid_infered_static_and_const.rs:1:24 | LL | const FOO: dyn Fn() -> _ = ""; | ^ not allowed in type signatures error[E0121]: the placeholder `_` is not allowed within types on item signatures for static items --> $DIR/invalid_infered_static_and_const.rs:2:25 | LL | static BOO: dyn Fn() -> _ = ""; | ^ not allowed in type signatures error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0121`.