{"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"formal_and_expected_inputs:"}]}
        formal_and_expected_inputs: IndexVec<ExpectedIdx, (Ty<'tcx>, Ty<'tcx>)>,
        compatibility_diagonal: IndexVec<ProvidedIdx, Compatibility<'tcx>>,
        provided_args: IndexVec<ProvidedIdx, &'tcx hir::Expr<'tcx>>,