{"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"matched_inputs:"}]}
        matched_inputs: &IndexVec<ExpectedIdx, Option<ProvidedIdx>>,
        callable_def_id: Option<DefId>,
        provided_arg_tys: &IndexVec<ProvidedIdx, (Ty<'tcx>, Span)>,