{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"formal_and_expected_inputs:"}]}
        formal_and_expected_inputs: &IndexVec<ExpectedIdx, (Ty<'tcx>, Ty<'tcx>)>,
        provided_arg_tys: &IndexVec<ProvidedIdx, (Ty<'tcx>, Span)>,
        is_method: bool,