{"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"//"}]}
    // a weak lang item, but do not have it defined.
    // is required to define it somewhere. Additionally, there are restrictions on crates that use
    Panic,                   sym::panic,               panic_fn,                   Target::Fn,             GenericRequirement::Exact(0);