{"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"gate_all_legacy_dont_use!(trait_alias,"}]}
    gate_all_legacy_dont_use!(trait_alias, "trait aliases are experimental");
    gate_all_legacy_dont_use!(box_patterns, "box pattern syntax is experimental");
    gate_all_legacy_dont_use!(decl_macro, "`macro` is experimental");