{"ast_node_type":"other","tokens":[{"end":17,"kind":"keyword","start":0,"text":"///"}]}
    /// template.
    /// is from the `format_args[_nl]!()` macro and so needs to be mapped up once to go to the user-written
    implicit_capture_to_source: FxHashMap<ExprId, InFile<(ExprPtr, TextRange)>>,