8944: minor: explain why nested `TypeRef` aren't interned r=jonas-schievink a=jonas-schievink
bors r+
Co-authored-by: Jonas Schievink <jonasschievink@gmail.com>
}
/// Compare ty::Ty
+///
+/// Note: Most users of `TypeRef` that end up in the salsa database intern it using
+/// `Interned<TypeRef>` to save space. But notably, nested `TypeRef`s are not interned, since that
+/// does not seem to save any noticeable amount of memory.
#[derive(Clone, PartialEq, Eq, Hash, Debug)]
pub enum TypeRef {
Never,