{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"//"}]}
    // case of `panic!(some_macro!())` or `unreachable!(some_macro!())`.
    // Find the span of the argument to `panic!()` or `unreachable!`, before expansion in the
    // We don't use source_callsite(), because this `panic!(..)` might itself