{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"///"}]}
        /// This `Span` is the span of the function, without the dot and receiver
        // FIXME(explicit_tail_calls): should we have the span for `become`? is this span accurate? do we need it?
        /// (e.g. `foo(a, b)` in `x.foo(a, b)`