{"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"(GenericKind::Alias(a1),"}]}
                (GenericKind::Alias(a1), ty::Alias(_, a2)) if a1.def_id == a2.def_id => {}
                (GenericKind::Placeholder(p1), ty::Placeholder(p2)) if p1 == p2 => {}
                _ => return None,