{"ast_node_type":"other","tokens":[{"end":136,"kind":"keyword","start":0,"text":"Panic,"}]}
    Panic,                   sym::panic,               panic_fn,                   Target::Fn,             GenericRequirement::Exact(0);
    // a weak lang item, but do not have it defined.
    PanicNounwind,           sym::panic_nounwind,      panic_nounwind,             Target::Fn,             GenericRequirement::Exact(0);