{"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"///"}]}
    /// we've found a `yield`. These can arise either from "plain" coroutine
    /// This is a coroutine expression -- i.e. a closure expression in which
    ///  usage (e.g. `let x = || { yield (); }`) or from a desugared expression