{"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"//"}]}
        // LHS of the nested macro (and RHS of the outer macro) is parsed as MetaVar(y) Colon
        // the outer macro. See ui/macros/macro-of-higher-order.rs where $y:$fragment in the
        // MetaVar(fragment) and not as MetaVarDecl(y, fragment).