{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"result_to_single(ecx.forced_ambiguity(MaybeCause::Ambiguity))"}]}
                    result_to_single(ecx.forced_ambiguity(MaybeCause::Ambiguity))
                (_, ty::Infer(ty::TyVar(..))) => {
                }