-#![feature(custom_attribute)]
-
type A = rustfmt; //~ ERROR expected type, found tool module `rustfmt`
type B = rustfmt::skip; //~ ERROR expected type, found tool attribute `rustfmt::skip`
#[derive(rustfmt)] //~ ERROR cannot find derive macro `rustfmt` in this scope
struct S;
-#[rustfmt] // OK, interpreted as a custom attribute
+// Interpreted as a feature gated custom attribute
+#[rustfmt] //~ ERROR attribute `rustfmt` is currently unknown
fn check() {}
#[rustfmt::skip] // OK