{"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"provided_args:"}]}
        provided_args: IndexVec<ProvidedIdx, &'tcx hir::Expr<'tcx>>,
        formal_and_expected_inputs: IndexVec<ExpectedIdx, (Ty<'tcx>, Ty<'tcx>)>,
        c_variadic: bool,