{"ast_node_type":"other","tokens":[{"end":32,"kind":"keyword","start":0,"text":"infcx:"}]}
        infcx: &InferCtxt<'tcx>,
        root_cx: &mut BorrowCheckRootCtxt<'tcx>,
        opaque_ty_decls: FxIndexMap<OpaqueTypeKey<'tcx>, OpaqueHiddenType<'tcx>>,