{"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"hir::ItemKind::TraitAlias(_,"}]}
        hir::ItemKind::TraitAlias(_, generics, supertraits) => (generics, supertraits),
        hir::ItemKind::Trait(.., generics, supertraits, _) => (generics, supertraits),
        _ => span_bug!(item.span, "super_predicates invoked on non-trait"),