{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"gate_all!(builtin_syntax,"}]}
    gate_all!(builtin_syntax, "`builtin #` syntax is unstable");
    gate_all!(const_closures, "const closures are experimental");
    gate_all!(ergonomic_clones, "ergonomic clones are experimental");