{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"Ref(..)"}]}
            Ref(..) => cx.dcx().span_bug(span, "ref in a path in generic `derive`"),
            Path(p) => p.to_path(cx, span, self_ty, generics),
            Unit => cx.dcx().span_bug(span, "unit in a path in generic `derive`"),