{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"///"}]}
    /// truncate them, and we want the correct span to be reported.
    /// copy all captures of the inner closure to the outer closure, and then we may
    span_stacks: SmallVec<[SmallVec<[MirSpan; 3]>; 3]>,