Address review comments

src/test/ui/rfc-2008-non-exhaustive/variants_fictive_visibility.rs

@@ -4,6 +4,9 @@
 extern crate variants;
 
 const S: u8 = 0;
+
+// OK, `Struct` in value namespace is crate-private, so it's filtered away
+// and there's no conflict with the previously defined `const S`.
 use variants::NonExhaustiveVariants::Struct as S;
 
 fn main() {}