diff --git a/Grammar/python.gram b/Grammar/python.gram
index dd425ef..2c350ef 100644
--- a/Grammar/python.gram
+++ b/Grammar/python.gram
@@ -329,7 +329,11 @@
     | lambdef
 
 lambdef[expr_ty]:
-    | 'lambda' a=[lambda_parameters] ':' b=expression { _Py_Lambda((a) ? a : CHECK(_PyPegen_empty_arguments(p)), b, EXTRA) }
+    | 'lambda' a=[lambda_params] ':' b=expression { _Py_Lambda((a) ? a : CHECK(_PyPegen_empty_arguments(p)), b, EXTRA) }
+
+lambda_params[arguments_ty]:
+    | invalid_lambda_parameters
+    | lambda_parameters
 
 # lambda_parameters etc. duplicates parameters but without annotations
 # or type comments, and if there's no comma after a parameter, we expect
@@ -669,6 +673,9 @@
 invalid_parameters:
     | param_no_default* (slash_with_default | param_with_default+) param_no_default {
         RAISE_SYNTAX_ERROR("non-default argument follows default argument") }
+invalid_lambda_parameters:
+    | lambda_param_no_default* (lambda_slash_with_default | lambda_param_with_default+) lambda_param_no_default {
+        RAISE_SYNTAX_ERROR("non-default argument follows default argument") }
 invalid_star_etc:
     | '*' (')' | ',' (')' | '**')) { RAISE_SYNTAX_ERROR("named arguments must follow bare *") }
     | '*' ',' TYPE_COMMENT { RAISE_SYNTAX_ERROR("bare * has associated type comment") }
diff --git a/Lib/test/test_positional_only_arg.py b/Lib/test/test_positional_only_arg.py
index f7bd401..0a9503e 100644
--- a/Lib/test/test_positional_only_arg.py
+++ b/Lib/test/test_positional_only_arg.py
@@ -4,7 +4,7 @@
 import pickle
 import unittest
 
-from test.support import check_syntax_error, use_old_parser
+from test.support import check_syntax_error
 
 
 def global_pos_only_f(a, b, /):
@@ -23,12 +23,10 @@
             compile(codestr + "\n", "<test>", "single")
 
     def test_invalid_syntax_errors(self):
-        if use_old_parser():
-            check_syntax_error(self, "def f(a, b = 5, /, c): pass", "non-default argument follows default argument")
-            check_syntax_error(self, "def f(a = 5, b, /, c): pass", "non-default argument follows default argument")
-            check_syntax_error(self, "def f(a = 5, b=1, /, c, *, d=2): pass", "non-default argument follows default argument")
-            check_syntax_error(self, "def f(a = 5, b, /): pass", "non-default argument follows default argument")
-
+        check_syntax_error(self, "def f(a, b = 5, /, c): pass", "non-default argument follows default argument")
+        check_syntax_error(self, "def f(a = 5, b, /, c): pass", "non-default argument follows default argument")
+        check_syntax_error(self, "def f(a = 5, b=1, /, c, *, d=2): pass", "non-default argument follows default argument")
+        check_syntax_error(self, "def f(a = 5, b, /): pass", "non-default argument follows default argument")
         check_syntax_error(self, "def f(*args, /): pass")
         check_syntax_error(self, "def f(*args, a, /): pass")
         check_syntax_error(self, "def f(**kwargs, /): pass")
@@ -46,12 +44,10 @@
         check_syntax_error(self, "def f(a, *, c, /, d, e): pass")
 
     def test_invalid_syntax_errors_async(self):
-        if use_old_parser():
-            check_syntax_error(self, "async def f(a, b = 5, /, c): pass", "non-default argument follows default argument")
-            check_syntax_error(self, "async def f(a = 5, b, /, c): pass", "non-default argument follows default argument")
-            check_syntax_error(self, "async def f(a = 5, b=1, /, c, d=2): pass", "non-default argument follows default argument")
-            check_syntax_error(self, "async def f(a = 5, b, /): pass", "non-default argument follows default argument")
-
+        check_syntax_error(self, "async def f(a, b = 5, /, c): pass", "non-default argument follows default argument")
+        check_syntax_error(self, "async def f(a = 5, b, /, c): pass", "non-default argument follows default argument")
+        check_syntax_error(self, "async def f(a = 5, b=1, /, c, d=2): pass", "non-default argument follows default argument")
+        check_syntax_error(self, "async def f(a = 5, b, /): pass", "non-default argument follows default argument")
         check_syntax_error(self, "async def f(*args, /): pass")
         check_syntax_error(self, "async def f(*args, a, /): pass")
         check_syntax_error(self, "async def f(**kwargs, /): pass")
@@ -235,11 +231,9 @@
         self.assertEqual(x(1, 2), 3)
 
     def test_invalid_syntax_lambda(self):
-        if use_old_parser():
-            check_syntax_error(self, "lambda a, b = 5, /, c: None", "non-default argument follows default argument")
-            check_syntax_error(self, "lambda a = 5, b, /, c: None", "non-default argument follows default argument")
-            check_syntax_error(self, "lambda a = 5, b, /: None", "non-default argument follows default argument")
-
+        check_syntax_error(self, "lambda a, b = 5, /, c: None", "non-default argument follows default argument")
+        check_syntax_error(self, "lambda a = 5, b, /, c: None", "non-default argument follows default argument")
+        check_syntax_error(self, "lambda a = 5, b, /: None", "non-default argument follows default argument")
         check_syntax_error(self, "lambda *args, /: None")
         check_syntax_error(self, "lambda *args, a, /: None")
         check_syntax_error(self, "lambda **kwargs, /: None")
diff --git a/Parser/pegen/parse.c b/Parser/pegen/parse.c
index e5738e3..4f13bf7 100644
--- a/Parser/pegen/parse.c
+++ b/Parser/pegen/parse.c
@@ -144,244 +144,249 @@
 #define expressions_type 1066
 #define expression_type 1067
 #define lambdef_type 1068
-#define lambda_parameters_type 1069
-#define lambda_slash_no_default_type 1070
-#define lambda_slash_with_default_type 1071
-#define lambda_star_etc_type 1072
-#define lambda_kwds_type 1073
-#define lambda_param_no_default_type 1074
-#define lambda_param_with_default_type 1075
-#define lambda_param_maybe_default_type 1076
-#define lambda_param_type 1077
-#define disjunction_type 1078
-#define conjunction_type 1079
-#define inversion_type 1080
-#define comparison_type 1081
-#define compare_op_bitwise_or_pair_type 1082
-#define eq_bitwise_or_type 1083
-#define noteq_bitwise_or_type 1084
-#define lte_bitwise_or_type 1085
-#define lt_bitwise_or_type 1086
-#define gte_bitwise_or_type 1087
-#define gt_bitwise_or_type 1088
-#define notin_bitwise_or_type 1089
-#define in_bitwise_or_type 1090
-#define isnot_bitwise_or_type 1091
-#define is_bitwise_or_type 1092
-#define bitwise_or_type 1093  // Left-recursive
-#define bitwise_xor_type 1094  // Left-recursive
-#define bitwise_and_type 1095  // Left-recursive
-#define shift_expr_type 1096  // Left-recursive
-#define sum_type 1097  // Left-recursive
-#define term_type 1098  // Left-recursive
-#define factor_type 1099
-#define power_type 1100
-#define await_primary_type 1101
-#define primary_type 1102  // Left-recursive
-#define slices_type 1103
-#define slice_type 1104
-#define atom_type 1105
-#define strings_type 1106
-#define list_type 1107
-#define listcomp_type 1108
-#define tuple_type 1109
-#define group_type 1110
-#define genexp_type 1111
-#define set_type 1112
-#define setcomp_type 1113
-#define dict_type 1114
-#define dictcomp_type 1115
-#define double_starred_kvpairs_type 1116
-#define double_starred_kvpair_type 1117
-#define kvpair_type 1118
-#define for_if_clauses_type 1119
-#define for_if_clause_type 1120
-#define yield_expr_type 1121
-#define arguments_type 1122
-#define args_type 1123
-#define kwargs_type 1124
-#define starred_expression_type 1125
-#define kwarg_or_starred_type 1126
-#define kwarg_or_double_starred_type 1127
-#define star_targets_type 1128
-#define star_targets_seq_type 1129
-#define star_target_type 1130
-#define star_atom_type 1131
-#define single_target_type 1132
-#define single_subscript_attribute_target_type 1133
-#define del_targets_type 1134
-#define del_target_type 1135
-#define del_t_atom_type 1136
-#define del_target_end_type 1137
-#define targets_type 1138
-#define target_type 1139
-#define t_primary_type 1140  // Left-recursive
-#define t_lookahead_type 1141
-#define t_atom_type 1142
-#define incorrect_arguments_type 1143
-#define invalid_kwarg_type 1144
-#define invalid_named_expression_type 1145
-#define invalid_assignment_type 1146
-#define invalid_block_type 1147
-#define invalid_comprehension_type 1148
-#define invalid_dict_comprehension_type 1149
-#define invalid_parameters_type 1150
-#define invalid_star_etc_type 1151
-#define invalid_lambda_star_etc_type 1152
-#define invalid_double_type_comments_type 1153
-#define invalid_del_target_type 1154
-#define invalid_import_from_targets_type 1155
-#define _loop0_1_type 1156
-#define _loop0_2_type 1157
-#define _loop0_4_type 1158
-#define _gather_3_type 1159
-#define _loop0_6_type 1160
-#define _gather_5_type 1161
-#define _loop0_8_type 1162
-#define _gather_7_type 1163
-#define _loop0_10_type 1164
-#define _gather_9_type 1165
-#define _loop1_11_type 1166
-#define _loop0_13_type 1167
-#define _gather_12_type 1168
-#define _tmp_14_type 1169
-#define _tmp_15_type 1170
-#define _tmp_16_type 1171
-#define _tmp_17_type 1172
-#define _tmp_18_type 1173
-#define _tmp_19_type 1174
-#define _tmp_20_type 1175
-#define _tmp_21_type 1176
-#define _loop1_22_type 1177
-#define _tmp_23_type 1178
-#define _tmp_24_type 1179
-#define _loop0_26_type 1180
-#define _gather_25_type 1181
-#define _loop0_28_type 1182
-#define _gather_27_type 1183
-#define _tmp_29_type 1184
-#define _loop0_30_type 1185
-#define _loop1_31_type 1186
-#define _loop0_33_type 1187
-#define _gather_32_type 1188
-#define _tmp_34_type 1189
-#define _loop0_36_type 1190
-#define _gather_35_type 1191
-#define _tmp_37_type 1192
-#define _loop0_39_type 1193
-#define _gather_38_type 1194
-#define _loop0_41_type 1195
-#define _gather_40_type 1196
-#define _loop0_43_type 1197
-#define _gather_42_type 1198
-#define _loop0_45_type 1199
-#define _gather_44_type 1200
-#define _tmp_46_type 1201
-#define _loop1_47_type 1202
-#define _tmp_48_type 1203
-#define _tmp_49_type 1204
-#define _tmp_50_type 1205
-#define _tmp_51_type 1206
-#define _tmp_52_type 1207
-#define _loop0_53_type 1208
-#define _loop0_54_type 1209
-#define _loop0_55_type 1210
-#define _loop1_56_type 1211
-#define _loop0_57_type 1212
-#define _loop1_58_type 1213
-#define _loop1_59_type 1214
-#define _loop1_60_type 1215
-#define _loop0_61_type 1216
-#define _loop1_62_type 1217
-#define _loop0_63_type 1218
-#define _loop1_64_type 1219
-#define _loop0_65_type 1220
-#define _loop1_66_type 1221
-#define _loop1_67_type 1222
-#define _tmp_68_type 1223
-#define _loop0_70_type 1224
-#define _gather_69_type 1225
-#define _loop1_71_type 1226
-#define _loop0_73_type 1227
-#define _gather_72_type 1228
-#define _loop1_74_type 1229
-#define _loop0_75_type 1230
-#define _loop0_76_type 1231
-#define _loop0_77_type 1232
-#define _loop1_78_type 1233
-#define _loop0_79_type 1234
-#define _loop1_80_type 1235
-#define _loop1_81_type 1236
-#define _loop1_82_type 1237
-#define _loop0_83_type 1238
-#define _loop1_84_type 1239
-#define _loop0_85_type 1240
-#define _loop1_86_type 1241
-#define _loop0_87_type 1242
-#define _loop1_88_type 1243
-#define _loop1_89_type 1244
-#define _loop1_90_type 1245
-#define _loop1_91_type 1246
-#define _tmp_92_type 1247
-#define _loop0_94_type 1248
-#define _gather_93_type 1249
-#define _tmp_95_type 1250
-#define _tmp_96_type 1251
-#define _tmp_97_type 1252
-#define _tmp_98_type 1253
-#define _loop1_99_type 1254
-#define _tmp_100_type 1255
-#define _tmp_101_type 1256
-#define _loop0_103_type 1257
-#define _gather_102_type 1258
-#define _loop1_104_type 1259
-#define _loop0_105_type 1260
-#define _loop0_106_type 1261
-#define _tmp_107_type 1262
-#define _tmp_108_type 1263
-#define _loop0_110_type 1264
-#define _gather_109_type 1265
-#define _loop0_112_type 1266
-#define _gather_111_type 1267
-#define _loop0_114_type 1268
-#define _gather_113_type 1269
-#define _loop0_116_type 1270
-#define _gather_115_type 1271
-#define _loop0_117_type 1272
-#define _loop0_119_type 1273
-#define _gather_118_type 1274
-#define _tmp_120_type 1275
-#define _loop0_122_type 1276
-#define _gather_121_type 1277
-#define _loop0_124_type 1278
-#define _gather_123_type 1279
-#define _tmp_125_type 1280
-#define _loop0_126_type 1281
-#define _tmp_127_type 1282
-#define _loop0_128_type 1283
-#define _loop0_129_type 1284
-#define _tmp_130_type 1285
-#define _tmp_131_type 1286
-#define _loop0_132_type 1287
-#define _tmp_133_type 1288
-#define _tmp_134_type 1289
-#define _tmp_135_type 1290
-#define _tmp_136_type 1291
-#define _tmp_137_type 1292
-#define _tmp_138_type 1293
-#define _tmp_139_type 1294
-#define _tmp_140_type 1295
-#define _tmp_141_type 1296
-#define _tmp_142_type 1297
-#define _tmp_143_type 1298
-#define _tmp_144_type 1299
-#define _tmp_145_type 1300
-#define _tmp_146_type 1301
-#define _tmp_147_type 1302
-#define _tmp_148_type 1303
-#define _loop1_149_type 1304
-#define _tmp_150_type 1305
-#define _tmp_151_type 1306
+#define lambda_params_type 1069
+#define lambda_parameters_type 1070
+#define lambda_slash_no_default_type 1071
+#define lambda_slash_with_default_type 1072
+#define lambda_star_etc_type 1073
+#define lambda_kwds_type 1074
+#define lambda_param_no_default_type 1075
+#define lambda_param_with_default_type 1076
+#define lambda_param_maybe_default_type 1077
+#define lambda_param_type 1078
+#define disjunction_type 1079
+#define conjunction_type 1080
+#define inversion_type 1081
+#define comparison_type 1082
+#define compare_op_bitwise_or_pair_type 1083
+#define eq_bitwise_or_type 1084
+#define noteq_bitwise_or_type 1085
+#define lte_bitwise_or_type 1086
+#define lt_bitwise_or_type 1087
+#define gte_bitwise_or_type 1088
+#define gt_bitwise_or_type 1089
+#define notin_bitwise_or_type 1090
+#define in_bitwise_or_type 1091
+#define isnot_bitwise_or_type 1092
+#define is_bitwise_or_type 1093
+#define bitwise_or_type 1094  // Left-recursive
+#define bitwise_xor_type 1095  // Left-recursive
+#define bitwise_and_type 1096  // Left-recursive
+#define shift_expr_type 1097  // Left-recursive
+#define sum_type 1098  // Left-recursive
+#define term_type 1099  // Left-recursive
+#define factor_type 1100
+#define power_type 1101
+#define await_primary_type 1102
+#define primary_type 1103  // Left-recursive
+#define slices_type 1104
+#define slice_type 1105
+#define atom_type 1106
+#define strings_type 1107
+#define list_type 1108
+#define listcomp_type 1109
+#define tuple_type 1110
+#define group_type 1111
+#define genexp_type 1112
+#define set_type 1113
+#define setcomp_type 1114
+#define dict_type 1115
+#define dictcomp_type 1116
+#define double_starred_kvpairs_type 1117
+#define double_starred_kvpair_type 1118
+#define kvpair_type 1119
+#define for_if_clauses_type 1120
+#define for_if_clause_type 1121
+#define yield_expr_type 1122
+#define arguments_type 1123
+#define args_type 1124
+#define kwargs_type 1125
+#define starred_expression_type 1126
+#define kwarg_or_starred_type 1127
+#define kwarg_or_double_starred_type 1128
+#define star_targets_type 1129
+#define star_targets_seq_type 1130
+#define star_target_type 1131
+#define star_atom_type 1132
+#define single_target_type 1133
+#define single_subscript_attribute_target_type 1134
+#define del_targets_type 1135
+#define del_target_type 1136
+#define del_t_atom_type 1137
+#define del_target_end_type 1138
+#define targets_type 1139
+#define target_type 1140
+#define t_primary_type 1141  // Left-recursive
+#define t_lookahead_type 1142
+#define t_atom_type 1143
+#define incorrect_arguments_type 1144
+#define invalid_kwarg_type 1145
+#define invalid_named_expression_type 1146
+#define invalid_assignment_type 1147
+#define invalid_block_type 1148
+#define invalid_comprehension_type 1149
+#define invalid_dict_comprehension_type 1150
+#define invalid_parameters_type 1151
+#define invalid_lambda_parameters_type 1152
+#define invalid_star_etc_type 1153
+#define invalid_lambda_star_etc_type 1154
+#define invalid_double_type_comments_type 1155
+#define invalid_del_target_type 1156
+#define invalid_import_from_targets_type 1157
+#define _loop0_1_type 1158
+#define _loop0_2_type 1159
+#define _loop0_4_type 1160
+#define _gather_3_type 1161
+#define _loop0_6_type 1162
+#define _gather_5_type 1163
+#define _loop0_8_type 1164
+#define _gather_7_type 1165
+#define _loop0_10_type 1166
+#define _gather_9_type 1167
+#define _loop1_11_type 1168
+#define _loop0_13_type 1169
+#define _gather_12_type 1170
+#define _tmp_14_type 1171
+#define _tmp_15_type 1172
+#define _tmp_16_type 1173
+#define _tmp_17_type 1174
+#define _tmp_18_type 1175
+#define _tmp_19_type 1176
+#define _tmp_20_type 1177
+#define _tmp_21_type 1178
+#define _loop1_22_type 1179
+#define _tmp_23_type 1180
+#define _tmp_24_type 1181
+#define _loop0_26_type 1182
+#define _gather_25_type 1183
+#define _loop0_28_type 1184
+#define _gather_27_type 1185
+#define _tmp_29_type 1186
+#define _loop0_30_type 1187
+#define _loop1_31_type 1188
+#define _loop0_33_type 1189
+#define _gather_32_type 1190
+#define _tmp_34_type 1191
+#define _loop0_36_type 1192
+#define _gather_35_type 1193
+#define _tmp_37_type 1194
+#define _loop0_39_type 1195
+#define _gather_38_type 1196
+#define _loop0_41_type 1197
+#define _gather_40_type 1198
+#define _loop0_43_type 1199
+#define _gather_42_type 1200
+#define _loop0_45_type 1201
+#define _gather_44_type 1202
+#define _tmp_46_type 1203
+#define _loop1_47_type 1204
+#define _tmp_48_type 1205
+#define _tmp_49_type 1206
+#define _tmp_50_type 1207
+#define _tmp_51_type 1208
+#define _tmp_52_type 1209
+#define _loop0_53_type 1210
+#define _loop0_54_type 1211
+#define _loop0_55_type 1212
+#define _loop1_56_type 1213
+#define _loop0_57_type 1214
+#define _loop1_58_type 1215
+#define _loop1_59_type 1216
+#define _loop1_60_type 1217
+#define _loop0_61_type 1218
+#define _loop1_62_type 1219
+#define _loop0_63_type 1220
+#define _loop1_64_type 1221
+#define _loop0_65_type 1222
+#define _loop1_66_type 1223
+#define _loop1_67_type 1224
+#define _tmp_68_type 1225
+#define _loop0_70_type 1226
+#define _gather_69_type 1227
+#define _loop1_71_type 1228
+#define _loop0_73_type 1229
+#define _gather_72_type 1230
+#define _loop1_74_type 1231
+#define _loop0_75_type 1232
+#define _loop0_76_type 1233
+#define _loop0_77_type 1234
+#define _loop1_78_type 1235
+#define _loop0_79_type 1236
+#define _loop1_80_type 1237
+#define _loop1_81_type 1238
+#define _loop1_82_type 1239
+#define _loop0_83_type 1240
+#define _loop1_84_type 1241
+#define _loop0_85_type 1242
+#define _loop1_86_type 1243
+#define _loop0_87_type 1244
+#define _loop1_88_type 1245
+#define _loop1_89_type 1246
+#define _loop1_90_type 1247
+#define _loop1_91_type 1248
+#define _tmp_92_type 1249
+#define _loop0_94_type 1250
+#define _gather_93_type 1251
+#define _tmp_95_type 1252
+#define _tmp_96_type 1253
+#define _tmp_97_type 1254
+#define _tmp_98_type 1255
+#define _loop1_99_type 1256
+#define _tmp_100_type 1257
+#define _tmp_101_type 1258
+#define _loop0_103_type 1259
+#define _gather_102_type 1260
+#define _loop1_104_type 1261
+#define _loop0_105_type 1262
+#define _loop0_106_type 1263
+#define _tmp_107_type 1264
+#define _tmp_108_type 1265
+#define _loop0_110_type 1266
+#define _gather_109_type 1267
+#define _loop0_112_type 1268
+#define _gather_111_type 1269
+#define _loop0_114_type 1270
+#define _gather_113_type 1271
+#define _loop0_116_type 1272
+#define _gather_115_type 1273
+#define _loop0_117_type 1274
+#define _loop0_119_type 1275
+#define _gather_118_type 1276
+#define _tmp_120_type 1277
+#define _loop0_122_type 1278
+#define _gather_121_type 1279
+#define _loop0_124_type 1280
+#define _gather_123_type 1281
+#define _tmp_125_type 1282
+#define _loop0_126_type 1283
+#define _tmp_127_type 1284
+#define _loop0_128_type 1285
+#define _loop0_129_type 1286
+#define _tmp_130_type 1287
+#define _tmp_131_type 1288
+#define _loop0_132_type 1289
+#define _tmp_133_type 1290
+#define _loop0_134_type 1291
+#define _tmp_135_type 1292
+#define _tmp_136_type 1293
+#define _tmp_137_type 1294
+#define _tmp_138_type 1295
+#define _tmp_139_type 1296
+#define _tmp_140_type 1297
+#define _tmp_141_type 1298
+#define _tmp_142_type 1299
+#define _tmp_143_type 1300
+#define _tmp_144_type 1301
+#define _tmp_145_type 1302
+#define _tmp_146_type 1303
+#define _tmp_147_type 1304
+#define _tmp_148_type 1305
+#define _tmp_149_type 1306
+#define _tmp_150_type 1307
+#define _loop1_151_type 1308
+#define _loop1_152_type 1309
+#define _tmp_153_type 1310
+#define _tmp_154_type 1311
 
 static mod_ty file_rule(Parser *p);
 static mod_ty interactive_rule(Parser *p);
@@ -452,6 +457,7 @@
 static expr_ty expressions_rule(Parser *p);
 static expr_ty expression_rule(Parser *p);
 static expr_ty lambdef_rule(Parser *p);
+static arguments_ty lambda_params_rule(Parser *p);
 static arguments_ty lambda_parameters_rule(Parser *p);
 static asdl_seq* lambda_slash_no_default_rule(Parser *p);
 static SlashWithDefault* lambda_slash_with_default_rule(Parser *p);
@@ -534,6 +540,7 @@
 static void *invalid_comprehension_rule(Parser *p);
 static void *invalid_dict_comprehension_rule(Parser *p);
 static void *invalid_parameters_rule(Parser *p);
+static void *invalid_lambda_parameters_rule(Parser *p);
 static void *invalid_star_etc_rule(Parser *p);
 static void *invalid_lambda_star_etc_rule(Parser *p);
 static void *invalid_double_type_comments_rule(Parser *p);
@@ -672,7 +679,7 @@
 static void *_tmp_131_rule(Parser *p);
 static asdl_seq *_loop0_132_rule(Parser *p);
 static void *_tmp_133_rule(Parser *p);
-static void *_tmp_134_rule(Parser *p);
+static asdl_seq *_loop0_134_rule(Parser *p);
 static void *_tmp_135_rule(Parser *p);
 static void *_tmp_136_rule(Parser *p);
 static void *_tmp_137_rule(Parser *p);
@@ -687,9 +694,12 @@
 static void *_tmp_146_rule(Parser *p);
 static void *_tmp_147_rule(Parser *p);
 static void *_tmp_148_rule(Parser *p);
-static asdl_seq *_loop1_149_rule(Parser *p);
+static void *_tmp_149_rule(Parser *p);
 static void *_tmp_150_rule(Parser *p);
-static void *_tmp_151_rule(Parser *p);
+static asdl_seq *_loop1_151_rule(Parser *p);
+static asdl_seq *_loop1_152_rule(Parser *p);
+static void *_tmp_153_rule(Parser *p);
+static void *_tmp_154_rule(Parser *p);
 
 
 // file: statements? $
@@ -6972,7 +6982,7 @@
     return _res;
 }
 
-// lambdef: 'lambda' lambda_parameters? ':' expression
+// lambdef: 'lambda' lambda_params? ':' expression
 static expr_ty
 lambdef_rule(Parser *p)
 {
@@ -6992,12 +7002,12 @@
     UNUSED(_start_lineno); // Only used by EXTRA macro
     int _start_col_offset = p->tokens[_mark]->col_offset;
     UNUSED(_start_col_offset); // Only used by EXTRA macro
-    { // 'lambda' lambda_parameters? ':' expression
+    { // 'lambda' lambda_params? ':' expression
         if (p->error_indicator) {
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> lambdef[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'lambda' lambda_parameters? ':' expression"));
+        D(fprintf(stderr, "%*c> lambdef[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'lambda' lambda_params? ':' expression"));
         Token * _keyword;
         Token * _literal;
         void *a;
@@ -7005,14 +7015,14 @@
         if (
             (_keyword = _PyPegen_expect_token(p, 524))  // token='lambda'
             &&
-            (a = lambda_parameters_rule(p), 1)  // lambda_parameters?
+            (a = lambda_params_rule(p), 1)  // lambda_params?
             &&
             (_literal = _PyPegen_expect_token(p, 11))  // token=':'
             &&
             (b = expression_rule(p))  // expression
         )
         {
-            D(fprintf(stderr, "%*c+ lambdef[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'lambda' lambda_parameters? ':' expression"));
+            D(fprintf(stderr, "%*c+ lambdef[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'lambda' lambda_params? ':' expression"));
             Token *_token = _PyPegen_get_last_nonnwhitespace_token(p);
             if (_token == NULL) {
                 D(p->level--);
@@ -7032,7 +7042,62 @@
         }
         p->mark = _mark;
         D(fprintf(stderr, "%*c%s lambdef[%d-%d]: %s failed!\n", p->level, ' ',
-                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'lambda' lambda_parameters? ':' expression"));
+                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'lambda' lambda_params? ':' expression"));
+    }
+    _res = NULL;
+  done:
+    D(p->level--);
+    return _res;
+}
+
+// lambda_params: invalid_lambda_parameters | lambda_parameters
+static arguments_ty
+lambda_params_rule(Parser *p)
+{
+    D(p->level++);
+    if (p->error_indicator) {
+        D(p->level--);
+        return NULL;
+    }
+    arguments_ty _res = NULL;
+    int _mark = p->mark;
+    { // invalid_lambda_parameters
+        if (p->error_indicator) {
+            D(p->level--);
+            return NULL;
+        }
+        D(fprintf(stderr, "%*c> lambda_params[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "invalid_lambda_parameters"));
+        void *invalid_lambda_parameters_var;
+        if (
+            (invalid_lambda_parameters_var = invalid_lambda_parameters_rule(p))  // invalid_lambda_parameters
+        )
+        {
+            D(fprintf(stderr, "%*c+ lambda_params[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "invalid_lambda_parameters"));
+            _res = invalid_lambda_parameters_var;
+            goto done;
+        }
+        p->mark = _mark;
+        D(fprintf(stderr, "%*c%s lambda_params[%d-%d]: %s failed!\n", p->level, ' ',
+                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "invalid_lambda_parameters"));
+    }
+    { // lambda_parameters
+        if (p->error_indicator) {
+            D(p->level--);
+            return NULL;
+        }
+        D(fprintf(stderr, "%*c> lambda_params[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "lambda_parameters"));
+        arguments_ty lambda_parameters_var;
+        if (
+            (lambda_parameters_var = lambda_parameters_rule(p))  // lambda_parameters
+        )
+        {
+            D(fprintf(stderr, "%*c+ lambda_params[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "lambda_parameters"));
+            _res = lambda_parameters_var;
+            goto done;
+        }
+        p->mark = _mark;
+        D(fprintf(stderr, "%*c%s lambda_params[%d-%d]: %s failed!\n", p->level, ' ',
+                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "lambda_parameters"));
     }
     _res = NULL;
   done:
@@ -14997,6 +15062,54 @@
     return _res;
 }
 
+// invalid_lambda_parameters:
+//     | lambda_param_no_default* (lambda_slash_with_default | lambda_param_with_default+) lambda_param_no_default
+static void *
+invalid_lambda_parameters_rule(Parser *p)
+{
+    D(p->level++);
+    if (p->error_indicator) {
+        D(p->level--);
+        return NULL;
+    }
+    void * _res = NULL;
+    int _mark = p->mark;
+    { // lambda_param_no_default* (lambda_slash_with_default | lambda_param_with_default+) lambda_param_no_default
+        if (p->error_indicator) {
+            D(p->level--);
+            return NULL;
+        }
+        D(fprintf(stderr, "%*c> invalid_lambda_parameters[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "lambda_param_no_default* (lambda_slash_with_default | lambda_param_with_default+) lambda_param_no_default"));
+        asdl_seq * _loop0_134_var;
+        void *_tmp_135_var;
+        arg_ty lambda_param_no_default_var;
+        if (
+            (_loop0_134_var = _loop0_134_rule(p))  // lambda_param_no_default*
+            &&
+            (_tmp_135_var = _tmp_135_rule(p))  // lambda_slash_with_default | lambda_param_with_default+
+            &&
+            (lambda_param_no_default_var = lambda_param_no_default_rule(p))  // lambda_param_no_default
+        )
+        {
+            D(fprintf(stderr, "%*c+ invalid_lambda_parameters[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "lambda_param_no_default* (lambda_slash_with_default | lambda_param_with_default+) lambda_param_no_default"));
+            _res = RAISE_SYNTAX_ERROR ( "non-default argument follows default argument" );
+            if (_res == NULL && PyErr_Occurred()) {
+                p->error_indicator = 1;
+                D(p->level--);
+                return NULL;
+            }
+            goto done;
+        }
+        p->mark = _mark;
+        D(fprintf(stderr, "%*c%s invalid_lambda_parameters[%d-%d]: %s failed!\n", p->level, ' ',
+                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "lambda_param_no_default* (lambda_slash_with_default | lambda_param_with_default+) lambda_param_no_default"));
+    }
+    _res = NULL;
+  done:
+    D(p->level--);
+    return _res;
+}
+
 // invalid_star_etc: '*' (')' | ',' (')' | '**')) | '*' ',' TYPE_COMMENT
 static void *
 invalid_star_etc_rule(Parser *p)
@@ -15015,11 +15128,11 @@
         }
         D(fprintf(stderr, "%*c> invalid_star_etc[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'*' (')' | ',' (')' | '**'))"));
         Token * _literal;
-        void *_tmp_134_var;
+        void *_tmp_136_var;
         if (
             (_literal = _PyPegen_expect_token(p, 16))  // token='*'
             &&
-            (_tmp_134_var = _tmp_134_rule(p))  // ')' | ',' (')' | '**')
+            (_tmp_136_var = _tmp_136_rule(p))  // ')' | ',' (')' | '**')
         )
         {
             D(fprintf(stderr, "%*c+ invalid_star_etc[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'*' (')' | ',' (')' | '**'))"));
@@ -15089,11 +15202,11 @@
         }
         D(fprintf(stderr, "%*c> invalid_lambda_star_etc[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'*' (':' | ',' (':' | '**'))"));
         Token * _literal;
-        void *_tmp_135_var;
+        void *_tmp_137_var;
         if (
             (_literal = _PyPegen_expect_token(p, 16))  // token='*'
             &&
-            (_tmp_135_var = _tmp_135_rule(p))  // ':' | ',' (':' | '**')
+            (_tmp_137_var = _tmp_137_rule(p))  // ':' | ',' (':' | '**')
         )
         {
             D(fprintf(stderr, "%*c+ invalid_lambda_star_etc[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'*' (':' | ',' (':' | '**'))"));
@@ -16503,12 +16616,12 @@
             return NULL;
         }
         D(fprintf(stderr, "%*c> _loop1_22[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "(star_targets '=')"));
-        void *_tmp_136_var;
+        void *_tmp_138_var;
         while (
-            (_tmp_136_var = _tmp_136_rule(p))  // star_targets '='
+            (_tmp_138_var = _tmp_138_rule(p))  // star_targets '='
         )
         {
-            _res = _tmp_136_var;
+            _res = _tmp_138_var;
             if (_n == _children_capacity) {
                 _children_capacity *= 2;
                 void **_new_children = PyMem_Realloc(_children, _children_capacity*sizeof(void *));
@@ -16956,12 +17069,12 @@
             return NULL;
         }
         D(fprintf(stderr, "%*c> _loop0_30[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "('.' | '...')"));
-        void *_tmp_137_var;
+        void *_tmp_139_var;
         while (
-            (_tmp_137_var = _tmp_137_rule(p))  // '.' | '...'
+            (_tmp_139_var = _tmp_139_rule(p))  // '.' | '...'
         )
         {
-            _res = _tmp_137_var;
+            _res = _tmp_139_var;
             if (_n == _children_capacity) {
                 _children_capacity *= 2;
                 void **_new_children = PyMem_Realloc(_children, _children_capacity*sizeof(void *));
@@ -17022,12 +17135,12 @@
             return NULL;
         }
         D(fprintf(stderr, "%*c> _loop1_31[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "('.' | '...')"));
-        void *_tmp_138_var;
+        void *_tmp_140_var;
         while (
-            (_tmp_138_var = _tmp_138_rule(p))  // '.' | '...'
+            (_tmp_140_var = _tmp_140_rule(p))  // '.' | '...'
         )
         {
-            _res = _tmp_138_var;
+            _res = _tmp_140_var;
             if (_n == _children_capacity) {
                 _children_capacity *= 2;
                 void **_new_children = PyMem_Realloc(_children, _children_capacity*sizeof(void *));
@@ -19154,12 +19267,12 @@
             return NULL;
         }
         D(fprintf(stderr, "%*c> _loop1_67[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "('@' named_expression NEWLINE)"));
-        void *_tmp_139_var;
+        void *_tmp_141_var;
         while (
-            (_tmp_139_var = _tmp_139_rule(p))  // '@' named_expression NEWLINE
+            (_tmp_141_var = _tmp_141_rule(p))  // '@' named_expression NEWLINE
         )
         {
-            _res = _tmp_139_var;
+            _res = _tmp_141_var;
             if (_n == _children_capacity) {
                 _children_capacity *= 2;
                 void **_new_children = PyMem_Realloc(_children, _children_capacity*sizeof(void *));
@@ -19386,12 +19499,12 @@
             return NULL;
         }
         D(fprintf(stderr, "%*c> _loop1_71[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "(',' star_expression)"));
-        void *_tmp_140_var;
+        void *_tmp_142_var;
         while (
-            (_tmp_140_var = _tmp_140_rule(p))  // ',' star_expression
+            (_tmp_142_var = _tmp_142_rule(p))  // ',' star_expression
         )
         {
-            _res = _tmp_140_var;
+            _res = _tmp_142_var;
             if (_n == _children_capacity) {
                 _children_capacity *= 2;
                 void **_new_children = PyMem_Realloc(_children, _children_capacity*sizeof(void *));
@@ -19571,12 +19684,12 @@
             return NULL;
         }
         D(fprintf(stderr, "%*c> _loop1_74[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "(',' expression)"));
-        void *_tmp_141_var;
+        void *_tmp_143_var;
         while (
-            (_tmp_141_var = _tmp_141_rule(p))  // ',' expression
+            (_tmp_143_var = _tmp_143_rule(p))  // ',' expression
         )
         {
-            _res = _tmp_141_var;
+            _res = _tmp_143_var;
             if (_n == _children_capacity) {
                 _children_capacity *= 2;
                 void **_new_children = PyMem_Realloc(_children, _children_capacity*sizeof(void *));
@@ -20601,12 +20714,12 @@
             return NULL;
         }
         D(fprintf(stderr, "%*c> _loop1_89[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "('or' conjunction)"));
-        void *_tmp_142_var;
+        void *_tmp_144_var;
         while (
-            (_tmp_142_var = _tmp_142_rule(p))  // 'or' conjunction
+            (_tmp_144_var = _tmp_144_rule(p))  // 'or' conjunction
         )
         {
-            _res = _tmp_142_var;
+            _res = _tmp_144_var;
             if (_n == _children_capacity) {
                 _children_capacity *= 2;
                 void **_new_children = PyMem_Realloc(_children, _children_capacity*sizeof(void *));
@@ -20672,12 +20785,12 @@
             return NULL;
         }
         D(fprintf(stderr, "%*c> _loop1_90[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "('and' inversion)"));
-        void *_tmp_143_var;
+        void *_tmp_145_var;
         while (
-            (_tmp_143_var = _tmp_143_rule(p))  // 'and' inversion
+            (_tmp_145_var = _tmp_145_rule(p))  // 'and' inversion
         )
         {
-            _res = _tmp_143_var;
+            _res = _tmp_145_var;
             if (_n == _children_capacity) {
                 _children_capacity *= 2;
                 void **_new_children = PyMem_Realloc(_children, _children_capacity*sizeof(void *));
@@ -21593,12 +21706,12 @@
             return NULL;
         }
         D(fprintf(stderr, "%*c> _loop0_105[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "('if' disjunction)"));
-        void *_tmp_144_var;
+        void *_tmp_146_var;
         while (
-            (_tmp_144_var = _tmp_144_rule(p))  // 'if' disjunction
+            (_tmp_146_var = _tmp_146_rule(p))  // 'if' disjunction
         )
         {
-            _res = _tmp_144_var;
+            _res = _tmp_146_var;
             if (_n == _children_capacity) {
                 _children_capacity *= 2;
                 void **_new_children = PyMem_Realloc(_children, _children_capacity*sizeof(void *));
@@ -21659,12 +21772,12 @@
             return NULL;
         }
         D(fprintf(stderr, "%*c> _loop0_106[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "('if' disjunction)"));
-        void *_tmp_145_var;
+        void *_tmp_147_var;
         while (
-            (_tmp_145_var = _tmp_145_rule(p))  // 'if' disjunction
+            (_tmp_147_var = _tmp_147_rule(p))  // 'if' disjunction
         )
         {
-            _res = _tmp_145_var;
+            _res = _tmp_147_var;
             if (_n == _children_capacity) {
                 _children_capacity *= 2;
                 void **_new_children = PyMem_Realloc(_children, _children_capacity*sizeof(void *));
@@ -22269,12 +22382,12 @@
             return NULL;
         }
         D(fprintf(stderr, "%*c> _loop0_117[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "(',' star_target)"));
-        void *_tmp_146_var;
+        void *_tmp_148_var;
         while (
-            (_tmp_146_var = _tmp_146_rule(p))  // ',' star_target
+            (_tmp_148_var = _tmp_148_rule(p))  // ',' star_target
         )
         {
-            _res = _tmp_146_var;
+            _res = _tmp_148_var;
             if (_n == _children_capacity) {
                 _children_capacity *= 2;
                 void **_new_children = PyMem_Realloc(_children, _children_capacity*sizeof(void *));
@@ -22878,12 +22991,12 @@
             return NULL;
         }
         D(fprintf(stderr, "%*c> _loop0_128[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "(star_targets '=')"));
-        void *_tmp_147_var;
+        void *_tmp_149_var;
         while (
-            (_tmp_147_var = _tmp_147_rule(p))  // star_targets '='
+            (_tmp_149_var = _tmp_149_rule(p))  // star_targets '='
         )
         {
-            _res = _tmp_147_var;
+            _res = _tmp_149_var;
             if (_n == _children_capacity) {
                 _children_capacity *= 2;
                 void **_new_children = PyMem_Realloc(_children, _children_capacity*sizeof(void *));
@@ -22944,12 +23057,12 @@
             return NULL;
         }
         D(fprintf(stderr, "%*c> _loop0_129[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "(star_targets '=')"));
-        void *_tmp_148_var;
+        void *_tmp_150_var;
         while (
-            (_tmp_148_var = _tmp_148_rule(p))  // star_targets '='
+            (_tmp_150_var = _tmp_150_rule(p))  // star_targets '='
         )
         {
-            _res = _tmp_148_var;
+            _res = _tmp_150_var;
             if (_n == _children_capacity) {
                 _children_capacity *= 2;
                 void **_new_children = PyMem_Realloc(_children, _children_capacity*sizeof(void *));
@@ -23214,13 +23327,13 @@
             return NULL;
         }
         D(fprintf(stderr, "%*c> _tmp_133[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "param_with_default+"));
-        asdl_seq * _loop1_149_var;
+        asdl_seq * _loop1_151_var;
         if (
-            (_loop1_149_var = _loop1_149_rule(p))  // param_with_default+
+            (_loop1_151_var = _loop1_151_rule(p))  // param_with_default+
         )
         {
             D(fprintf(stderr, "%*c+ _tmp_133[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "param_with_default+"));
-            _res = _loop1_149_var;
+            _res = _loop1_151_var;
             goto done;
         }
         p->mark = _mark;
@@ -23233,9 +23346,130 @@
     return _res;
 }
 
-// _tmp_134: ')' | ',' (')' | '**')
+// _loop0_134: lambda_param_no_default
+static asdl_seq *
+_loop0_134_rule(Parser *p)
+{
+    D(p->level++);
+    if (p->error_indicator) {
+        D(p->level--);
+        return NULL;
+    }
+    void *_res = NULL;
+    int _mark = p->mark;
+    int _start_mark = p->mark;
+    void **_children = PyMem_Malloc(sizeof(void *));
+    if (!_children) {
+        p->error_indicator = 1;
+        PyErr_NoMemory();
+        D(p->level--);
+        return NULL;
+    }
+    ssize_t _children_capacity = 1;
+    ssize_t _n = 0;
+    { // lambda_param_no_default
+        if (p->error_indicator) {
+            D(p->level--);
+            return NULL;
+        }
+        D(fprintf(stderr, "%*c> _loop0_134[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "lambda_param_no_default"));
+        arg_ty lambda_param_no_default_var;
+        while (
+            (lambda_param_no_default_var = lambda_param_no_default_rule(p))  // lambda_param_no_default
+        )
+        {
+            _res = lambda_param_no_default_var;
+            if (_n == _children_capacity) {
+                _children_capacity *= 2;
+                void **_new_children = PyMem_Realloc(_children, _children_capacity*sizeof(void *));
+                if (!_new_children) {
+                    p->error_indicator = 1;
+                    PyErr_NoMemory();
+                    D(p->level--);
+                    return NULL;
+                }
+                _children = _new_children;
+            }
+            _children[_n++] = _res;
+            _mark = p->mark;
+        }
+        p->mark = _mark;
+        D(fprintf(stderr, "%*c%s _loop0_134[%d-%d]: %s failed!\n", p->level, ' ',
+                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "lambda_param_no_default"));
+    }
+    asdl_seq *_seq = _Py_asdl_seq_new(_n, p->arena);
+    if (!_seq) {
+        PyMem_Free(_children);
+        p->error_indicator = 1;
+        PyErr_NoMemory();
+        D(p->level--);
+        return NULL;
+    }
+    for (int i = 0; i < _n; i++) asdl_seq_SET(_seq, i, _children[i]);
+    PyMem_Free(_children);
+    _PyPegen_insert_memo(p, _start_mark, _loop0_134_type, _seq);
+    D(p->level--);
+    return _seq;
+}
+
+// _tmp_135: lambda_slash_with_default | lambda_param_with_default+
 static void *
-_tmp_134_rule(Parser *p)
+_tmp_135_rule(Parser *p)
+{
+    D(p->level++);
+    if (p->error_indicator) {
+        D(p->level--);
+        return NULL;
+    }
+    void * _res = NULL;
+    int _mark = p->mark;
+    { // lambda_slash_with_default
+        if (p->error_indicator) {
+            D(p->level--);
+            return NULL;
+        }
+        D(fprintf(stderr, "%*c> _tmp_135[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "lambda_slash_with_default"));
+        SlashWithDefault* lambda_slash_with_default_var;
+        if (
+            (lambda_slash_with_default_var = lambda_slash_with_default_rule(p))  // lambda_slash_with_default
+        )
+        {
+            D(fprintf(stderr, "%*c+ _tmp_135[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "lambda_slash_with_default"));
+            _res = lambda_slash_with_default_var;
+            goto done;
+        }
+        p->mark = _mark;
+        D(fprintf(stderr, "%*c%s _tmp_135[%d-%d]: %s failed!\n", p->level, ' ',
+                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "lambda_slash_with_default"));
+    }
+    { // lambda_param_with_default+
+        if (p->error_indicator) {
+            D(p->level--);
+            return NULL;
+        }
+        D(fprintf(stderr, "%*c> _tmp_135[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "lambda_param_with_default+"));
+        asdl_seq * _loop1_152_var;
+        if (
+            (_loop1_152_var = _loop1_152_rule(p))  // lambda_param_with_default+
+        )
+        {
+            D(fprintf(stderr, "%*c+ _tmp_135[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "lambda_param_with_default+"));
+            _res = _loop1_152_var;
+            goto done;
+        }
+        p->mark = _mark;
+        D(fprintf(stderr, "%*c%s _tmp_135[%d-%d]: %s failed!\n", p->level, ' ',
+                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "lambda_param_with_default+"));
+    }
+    _res = NULL;
+  done:
+    D(p->level--);
+    return _res;
+}
+
+// _tmp_136: ')' | ',' (')' | '**')
+static void *
+_tmp_136_rule(Parser *p)
 {
     D(p->level++);
     if (p->error_indicator) {
@@ -23249,18 +23483,18 @@
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _tmp_134[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "')'"));
+        D(fprintf(stderr, "%*c> _tmp_136[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "')'"));
         Token * _literal;
         if (
             (_literal = _PyPegen_expect_token(p, 8))  // token=')'
         )
         {
-            D(fprintf(stderr, "%*c+ _tmp_134[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "')'"));
+            D(fprintf(stderr, "%*c+ _tmp_136[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "')'"));
             _res = _literal;
             goto done;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_134[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _tmp_136[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "')'"));
     }
     { // ',' (')' | '**')
@@ -23268,21 +23502,21 @@
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _tmp_134[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "',' (')' | '**')"));
+        D(fprintf(stderr, "%*c> _tmp_136[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "',' (')' | '**')"));
         Token * _literal;
-        void *_tmp_150_var;
+        void *_tmp_153_var;
         if (
             (_literal = _PyPegen_expect_token(p, 12))  // token=','
             &&
-            (_tmp_150_var = _tmp_150_rule(p))  // ')' | '**'
+            (_tmp_153_var = _tmp_153_rule(p))  // ')' | '**'
         )
         {
-            D(fprintf(stderr, "%*c+ _tmp_134[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "',' (')' | '**')"));
-            _res = _PyPegen_dummy_name(p, _literal, _tmp_150_var);
+            D(fprintf(stderr, "%*c+ _tmp_136[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "',' (')' | '**')"));
+            _res = _PyPegen_dummy_name(p, _literal, _tmp_153_var);
             goto done;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_134[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _tmp_136[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "',' (')' | '**')"));
     }
     _res = NULL;
@@ -23291,9 +23525,9 @@
     return _res;
 }
 
-// _tmp_135: ':' | ',' (':' | '**')
+// _tmp_137: ':' | ',' (':' | '**')
 static void *
-_tmp_135_rule(Parser *p)
+_tmp_137_rule(Parser *p)
 {
     D(p->level++);
     if (p->error_indicator) {
@@ -23307,18 +23541,18 @@
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _tmp_135[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "':'"));
+        D(fprintf(stderr, "%*c> _tmp_137[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "':'"));
         Token * _literal;
         if (
             (_literal = _PyPegen_expect_token(p, 11))  // token=':'
         )
         {
-            D(fprintf(stderr, "%*c+ _tmp_135[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "':'"));
+            D(fprintf(stderr, "%*c+ _tmp_137[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "':'"));
             _res = _literal;
             goto done;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_135[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _tmp_137[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "':'"));
     }
     { // ',' (':' | '**')
@@ -23326,21 +23560,21 @@
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _tmp_135[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "',' (':' | '**')"));
+        D(fprintf(stderr, "%*c> _tmp_137[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "',' (':' | '**')"));
         Token * _literal;
-        void *_tmp_151_var;
+        void *_tmp_154_var;
         if (
             (_literal = _PyPegen_expect_token(p, 12))  // token=','
             &&
-            (_tmp_151_var = _tmp_151_rule(p))  // ':' | '**'
+            (_tmp_154_var = _tmp_154_rule(p))  // ':' | '**'
         )
         {
-            D(fprintf(stderr, "%*c+ _tmp_135[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "',' (':' | '**')"));
-            _res = _PyPegen_dummy_name(p, _literal, _tmp_151_var);
+            D(fprintf(stderr, "%*c+ _tmp_137[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "',' (':' | '**')"));
+            _res = _PyPegen_dummy_name(p, _literal, _tmp_154_var);
             goto done;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_135[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _tmp_137[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "',' (':' | '**')"));
     }
     _res = NULL;
@@ -23349,9 +23583,9 @@
     return _res;
 }
 
-// _tmp_136: star_targets '='
+// _tmp_138: star_targets '='
 static void *
-_tmp_136_rule(Parser *p)
+_tmp_138_rule(Parser *p)
 {
     D(p->level++);
     if (p->error_indicator) {
@@ -23365,7 +23599,7 @@
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _tmp_136[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "star_targets '='"));
+        D(fprintf(stderr, "%*c> _tmp_138[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "star_targets '='"));
         Token * _literal;
         expr_ty z;
         if (
@@ -23374,7 +23608,7 @@
             (_literal = _PyPegen_expect_token(p, 22))  // token='='
         )
         {
-            D(fprintf(stderr, "%*c+ _tmp_136[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "star_targets '='"));
+            D(fprintf(stderr, "%*c+ _tmp_138[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "star_targets '='"));
             _res = z;
             if (_res == NULL && PyErr_Occurred()) {
                 p->error_indicator = 1;
@@ -23384,7 +23618,7 @@
             goto done;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_136[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _tmp_138[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "star_targets '='"));
     }
     _res = NULL;
@@ -23393,117 +23627,7 @@
     return _res;
 }
 
-// _tmp_137: '.' | '...'
-static void *
-_tmp_137_rule(Parser *p)
-{
-    D(p->level++);
-    if (p->error_indicator) {
-        D(p->level--);
-        return NULL;
-    }
-    void * _res = NULL;
-    int _mark = p->mark;
-    { // '.'
-        if (p->error_indicator) {
-            D(p->level--);
-            return NULL;
-        }
-        D(fprintf(stderr, "%*c> _tmp_137[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'.'"));
-        Token * _literal;
-        if (
-            (_literal = _PyPegen_expect_token(p, 23))  // token='.'
-        )
-        {
-            D(fprintf(stderr, "%*c+ _tmp_137[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'.'"));
-            _res = _literal;
-            goto done;
-        }
-        p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_137[%d-%d]: %s failed!\n", p->level, ' ',
-                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'.'"));
-    }
-    { // '...'
-        if (p->error_indicator) {
-            D(p->level--);
-            return NULL;
-        }
-        D(fprintf(stderr, "%*c> _tmp_137[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'...'"));
-        Token * _literal;
-        if (
-            (_literal = _PyPegen_expect_token(p, 52))  // token='...'
-        )
-        {
-            D(fprintf(stderr, "%*c+ _tmp_137[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'...'"));
-            _res = _literal;
-            goto done;
-        }
-        p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_137[%d-%d]: %s failed!\n", p->level, ' ',
-                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'...'"));
-    }
-    _res = NULL;
-  done:
-    D(p->level--);
-    return _res;
-}
-
-// _tmp_138: '.' | '...'
-static void *
-_tmp_138_rule(Parser *p)
-{
-    D(p->level++);
-    if (p->error_indicator) {
-        D(p->level--);
-        return NULL;
-    }
-    void * _res = NULL;
-    int _mark = p->mark;
-    { // '.'
-        if (p->error_indicator) {
-            D(p->level--);
-            return NULL;
-        }
-        D(fprintf(stderr, "%*c> _tmp_138[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'.'"));
-        Token * _literal;
-        if (
-            (_literal = _PyPegen_expect_token(p, 23))  // token='.'
-        )
-        {
-            D(fprintf(stderr, "%*c+ _tmp_138[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'.'"));
-            _res = _literal;
-            goto done;
-        }
-        p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_138[%d-%d]: %s failed!\n", p->level, ' ',
-                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'.'"));
-    }
-    { // '...'
-        if (p->error_indicator) {
-            D(p->level--);
-            return NULL;
-        }
-        D(fprintf(stderr, "%*c> _tmp_138[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'...'"));
-        Token * _literal;
-        if (
-            (_literal = _PyPegen_expect_token(p, 52))  // token='...'
-        )
-        {
-            D(fprintf(stderr, "%*c+ _tmp_138[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'...'"));
-            _res = _literal;
-            goto done;
-        }
-        p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_138[%d-%d]: %s failed!\n", p->level, ' ',
-                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'...'"));
-    }
-    _res = NULL;
-  done:
-    D(p->level--);
-    return _res;
-}
-
-// _tmp_139: '@' named_expression NEWLINE
+// _tmp_139: '.' | '...'
 static void *
 _tmp_139_rule(Parser *p)
 {
@@ -23514,12 +23638,122 @@
     }
     void * _res = NULL;
     int _mark = p->mark;
+    { // '.'
+        if (p->error_indicator) {
+            D(p->level--);
+            return NULL;
+        }
+        D(fprintf(stderr, "%*c> _tmp_139[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'.'"));
+        Token * _literal;
+        if (
+            (_literal = _PyPegen_expect_token(p, 23))  // token='.'
+        )
+        {
+            D(fprintf(stderr, "%*c+ _tmp_139[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'.'"));
+            _res = _literal;
+            goto done;
+        }
+        p->mark = _mark;
+        D(fprintf(stderr, "%*c%s _tmp_139[%d-%d]: %s failed!\n", p->level, ' ',
+                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'.'"));
+    }
+    { // '...'
+        if (p->error_indicator) {
+            D(p->level--);
+            return NULL;
+        }
+        D(fprintf(stderr, "%*c> _tmp_139[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'...'"));
+        Token * _literal;
+        if (
+            (_literal = _PyPegen_expect_token(p, 52))  // token='...'
+        )
+        {
+            D(fprintf(stderr, "%*c+ _tmp_139[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'...'"));
+            _res = _literal;
+            goto done;
+        }
+        p->mark = _mark;
+        D(fprintf(stderr, "%*c%s _tmp_139[%d-%d]: %s failed!\n", p->level, ' ',
+                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'...'"));
+    }
+    _res = NULL;
+  done:
+    D(p->level--);
+    return _res;
+}
+
+// _tmp_140: '.' | '...'
+static void *
+_tmp_140_rule(Parser *p)
+{
+    D(p->level++);
+    if (p->error_indicator) {
+        D(p->level--);
+        return NULL;
+    }
+    void * _res = NULL;
+    int _mark = p->mark;
+    { // '.'
+        if (p->error_indicator) {
+            D(p->level--);
+            return NULL;
+        }
+        D(fprintf(stderr, "%*c> _tmp_140[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'.'"));
+        Token * _literal;
+        if (
+            (_literal = _PyPegen_expect_token(p, 23))  // token='.'
+        )
+        {
+            D(fprintf(stderr, "%*c+ _tmp_140[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'.'"));
+            _res = _literal;
+            goto done;
+        }
+        p->mark = _mark;
+        D(fprintf(stderr, "%*c%s _tmp_140[%d-%d]: %s failed!\n", p->level, ' ',
+                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'.'"));
+    }
+    { // '...'
+        if (p->error_indicator) {
+            D(p->level--);
+            return NULL;
+        }
+        D(fprintf(stderr, "%*c> _tmp_140[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'...'"));
+        Token * _literal;
+        if (
+            (_literal = _PyPegen_expect_token(p, 52))  // token='...'
+        )
+        {
+            D(fprintf(stderr, "%*c+ _tmp_140[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'...'"));
+            _res = _literal;
+            goto done;
+        }
+        p->mark = _mark;
+        D(fprintf(stderr, "%*c%s _tmp_140[%d-%d]: %s failed!\n", p->level, ' ',
+                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'...'"));
+    }
+    _res = NULL;
+  done:
+    D(p->level--);
+    return _res;
+}
+
+// _tmp_141: '@' named_expression NEWLINE
+static void *
+_tmp_141_rule(Parser *p)
+{
+    D(p->level++);
+    if (p->error_indicator) {
+        D(p->level--);
+        return NULL;
+    }
+    void * _res = NULL;
+    int _mark = p->mark;
     { // '@' named_expression NEWLINE
         if (p->error_indicator) {
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _tmp_139[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'@' named_expression NEWLINE"));
+        D(fprintf(stderr, "%*c> _tmp_141[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'@' named_expression NEWLINE"));
         Token * _literal;
         expr_ty f;
         Token * newline_var;
@@ -23531,7 +23765,7 @@
             (newline_var = _PyPegen_expect_token(p, NEWLINE))  // token='NEWLINE'
         )
         {
-            D(fprintf(stderr, "%*c+ _tmp_139[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'@' named_expression NEWLINE"));
+            D(fprintf(stderr, "%*c+ _tmp_141[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'@' named_expression NEWLINE"));
             _res = f;
             if (_res == NULL && PyErr_Occurred()) {
                 p->error_indicator = 1;
@@ -23541,7 +23775,7 @@
             goto done;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_139[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _tmp_141[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'@' named_expression NEWLINE"));
     }
     _res = NULL;
@@ -23550,9 +23784,9 @@
     return _res;
 }
 
-// _tmp_140: ',' star_expression
+// _tmp_142: ',' star_expression
 static void *
-_tmp_140_rule(Parser *p)
+_tmp_142_rule(Parser *p)
 {
     D(p->level++);
     if (p->error_indicator) {
@@ -23566,7 +23800,7 @@
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _tmp_140[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "',' star_expression"));
+        D(fprintf(stderr, "%*c> _tmp_142[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "',' star_expression"));
         Token * _literal;
         expr_ty c;
         if (
@@ -23575,7 +23809,7 @@
             (c = star_expression_rule(p))  // star_expression
         )
         {
-            D(fprintf(stderr, "%*c+ _tmp_140[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "',' star_expression"));
+            D(fprintf(stderr, "%*c+ _tmp_142[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "',' star_expression"));
             _res = c;
             if (_res == NULL && PyErr_Occurred()) {
                 p->error_indicator = 1;
@@ -23585,7 +23819,7 @@
             goto done;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_140[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _tmp_142[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "',' star_expression"));
     }
     _res = NULL;
@@ -23594,9 +23828,9 @@
     return _res;
 }
 
-// _tmp_141: ',' expression
+// _tmp_143: ',' expression
 static void *
-_tmp_141_rule(Parser *p)
+_tmp_143_rule(Parser *p)
 {
     D(p->level++);
     if (p->error_indicator) {
@@ -23610,7 +23844,7 @@
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _tmp_141[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "',' expression"));
+        D(fprintf(stderr, "%*c> _tmp_143[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "',' expression"));
         Token * _literal;
         expr_ty c;
         if (
@@ -23619,7 +23853,7 @@
             (c = expression_rule(p))  // expression
         )
         {
-            D(fprintf(stderr, "%*c+ _tmp_141[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "',' expression"));
+            D(fprintf(stderr, "%*c+ _tmp_143[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "',' expression"));
             _res = c;
             if (_res == NULL && PyErr_Occurred()) {
                 p->error_indicator = 1;
@@ -23629,7 +23863,7 @@
             goto done;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_141[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _tmp_143[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "',' expression"));
     }
     _res = NULL;
@@ -23638,9 +23872,9 @@
     return _res;
 }
 
-// _tmp_142: 'or' conjunction
+// _tmp_144: 'or' conjunction
 static void *
-_tmp_142_rule(Parser *p)
+_tmp_144_rule(Parser *p)
 {
     D(p->level++);
     if (p->error_indicator) {
@@ -23654,7 +23888,7 @@
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _tmp_142[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'or' conjunction"));
+        D(fprintf(stderr, "%*c> _tmp_144[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'or' conjunction"));
         Token * _keyword;
         expr_ty c;
         if (
@@ -23663,7 +23897,7 @@
             (c = conjunction_rule(p))  // conjunction
         )
         {
-            D(fprintf(stderr, "%*c+ _tmp_142[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'or' conjunction"));
+            D(fprintf(stderr, "%*c+ _tmp_144[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'or' conjunction"));
             _res = c;
             if (_res == NULL && PyErr_Occurred()) {
                 p->error_indicator = 1;
@@ -23673,7 +23907,7 @@
             goto done;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_142[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _tmp_144[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'or' conjunction"));
     }
     _res = NULL;
@@ -23682,9 +23916,9 @@
     return _res;
 }
 
-// _tmp_143: 'and' inversion
+// _tmp_145: 'and' inversion
 static void *
-_tmp_143_rule(Parser *p)
+_tmp_145_rule(Parser *p)
 {
     D(p->level++);
     if (p->error_indicator) {
@@ -23698,7 +23932,7 @@
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _tmp_143[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'and' inversion"));
+        D(fprintf(stderr, "%*c> _tmp_145[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'and' inversion"));
         Token * _keyword;
         expr_ty c;
         if (
@@ -23707,7 +23941,7 @@
             (c = inversion_rule(p))  // inversion
         )
         {
-            D(fprintf(stderr, "%*c+ _tmp_143[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'and' inversion"));
+            D(fprintf(stderr, "%*c+ _tmp_145[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'and' inversion"));
             _res = c;
             if (_res == NULL && PyErr_Occurred()) {
                 p->error_indicator = 1;
@@ -23717,7 +23951,7 @@
             goto done;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_143[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _tmp_145[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'and' inversion"));
     }
     _res = NULL;
@@ -23726,95 +23960,7 @@
     return _res;
 }
 
-// _tmp_144: 'if' disjunction
-static void *
-_tmp_144_rule(Parser *p)
-{
-    D(p->level++);
-    if (p->error_indicator) {
-        D(p->level--);
-        return NULL;
-    }
-    void * _res = NULL;
-    int _mark = p->mark;
-    { // 'if' disjunction
-        if (p->error_indicator) {
-            D(p->level--);
-            return NULL;
-        }
-        D(fprintf(stderr, "%*c> _tmp_144[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'if' disjunction"));
-        Token * _keyword;
-        expr_ty z;
-        if (
-            (_keyword = _PyPegen_expect_token(p, 510))  // token='if'
-            &&
-            (z = disjunction_rule(p))  // disjunction
-        )
-        {
-            D(fprintf(stderr, "%*c+ _tmp_144[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'if' disjunction"));
-            _res = z;
-            if (_res == NULL && PyErr_Occurred()) {
-                p->error_indicator = 1;
-                D(p->level--);
-                return NULL;
-            }
-            goto done;
-        }
-        p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_144[%d-%d]: %s failed!\n", p->level, ' ',
-                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'if' disjunction"));
-    }
-    _res = NULL;
-  done:
-    D(p->level--);
-    return _res;
-}
-
-// _tmp_145: 'if' disjunction
-static void *
-_tmp_145_rule(Parser *p)
-{
-    D(p->level++);
-    if (p->error_indicator) {
-        D(p->level--);
-        return NULL;
-    }
-    void * _res = NULL;
-    int _mark = p->mark;
-    { // 'if' disjunction
-        if (p->error_indicator) {
-            D(p->level--);
-            return NULL;
-        }
-        D(fprintf(stderr, "%*c> _tmp_145[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'if' disjunction"));
-        Token * _keyword;
-        expr_ty z;
-        if (
-            (_keyword = _PyPegen_expect_token(p, 510))  // token='if'
-            &&
-            (z = disjunction_rule(p))  // disjunction
-        )
-        {
-            D(fprintf(stderr, "%*c+ _tmp_145[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'if' disjunction"));
-            _res = z;
-            if (_res == NULL && PyErr_Occurred()) {
-                p->error_indicator = 1;
-                D(p->level--);
-                return NULL;
-            }
-            goto done;
-        }
-        p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_145[%d-%d]: %s failed!\n", p->level, ' ',
-                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'if' disjunction"));
-    }
-    _res = NULL;
-  done:
-    D(p->level--);
-    return _res;
-}
-
-// _tmp_146: ',' star_target
+// _tmp_146: 'if' disjunction
 static void *
 _tmp_146_rule(Parser *p)
 {
@@ -23825,12 +23971,100 @@
     }
     void * _res = NULL;
     int _mark = p->mark;
+    { // 'if' disjunction
+        if (p->error_indicator) {
+            D(p->level--);
+            return NULL;
+        }
+        D(fprintf(stderr, "%*c> _tmp_146[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'if' disjunction"));
+        Token * _keyword;
+        expr_ty z;
+        if (
+            (_keyword = _PyPegen_expect_token(p, 510))  // token='if'
+            &&
+            (z = disjunction_rule(p))  // disjunction
+        )
+        {
+            D(fprintf(stderr, "%*c+ _tmp_146[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'if' disjunction"));
+            _res = z;
+            if (_res == NULL && PyErr_Occurred()) {
+                p->error_indicator = 1;
+                D(p->level--);
+                return NULL;
+            }
+            goto done;
+        }
+        p->mark = _mark;
+        D(fprintf(stderr, "%*c%s _tmp_146[%d-%d]: %s failed!\n", p->level, ' ',
+                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'if' disjunction"));
+    }
+    _res = NULL;
+  done:
+    D(p->level--);
+    return _res;
+}
+
+// _tmp_147: 'if' disjunction
+static void *
+_tmp_147_rule(Parser *p)
+{
+    D(p->level++);
+    if (p->error_indicator) {
+        D(p->level--);
+        return NULL;
+    }
+    void * _res = NULL;
+    int _mark = p->mark;
+    { // 'if' disjunction
+        if (p->error_indicator) {
+            D(p->level--);
+            return NULL;
+        }
+        D(fprintf(stderr, "%*c> _tmp_147[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'if' disjunction"));
+        Token * _keyword;
+        expr_ty z;
+        if (
+            (_keyword = _PyPegen_expect_token(p, 510))  // token='if'
+            &&
+            (z = disjunction_rule(p))  // disjunction
+        )
+        {
+            D(fprintf(stderr, "%*c+ _tmp_147[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'if' disjunction"));
+            _res = z;
+            if (_res == NULL && PyErr_Occurred()) {
+                p->error_indicator = 1;
+                D(p->level--);
+                return NULL;
+            }
+            goto done;
+        }
+        p->mark = _mark;
+        D(fprintf(stderr, "%*c%s _tmp_147[%d-%d]: %s failed!\n", p->level, ' ',
+                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'if' disjunction"));
+    }
+    _res = NULL;
+  done:
+    D(p->level--);
+    return _res;
+}
+
+// _tmp_148: ',' star_target
+static void *
+_tmp_148_rule(Parser *p)
+{
+    D(p->level++);
+    if (p->error_indicator) {
+        D(p->level--);
+        return NULL;
+    }
+    void * _res = NULL;
+    int _mark = p->mark;
     { // ',' star_target
         if (p->error_indicator) {
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _tmp_146[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "',' star_target"));
+        D(fprintf(stderr, "%*c> _tmp_148[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "',' star_target"));
         Token * _literal;
         expr_ty c;
         if (
@@ -23839,7 +24073,7 @@
             (c = star_target_rule(p))  // star_target
         )
         {
-            D(fprintf(stderr, "%*c+ _tmp_146[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "',' star_target"));
+            D(fprintf(stderr, "%*c+ _tmp_148[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "',' star_target"));
             _res = c;
             if (_res == NULL && PyErr_Occurred()) {
                 p->error_indicator = 1;
@@ -23849,7 +24083,7 @@
             goto done;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_146[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _tmp_148[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "',' star_target"));
     }
     _res = NULL;
@@ -23858,9 +24092,9 @@
     return _res;
 }
 
-// _tmp_147: star_targets '='
+// _tmp_149: star_targets '='
 static void *
-_tmp_147_rule(Parser *p)
+_tmp_149_rule(Parser *p)
 {
     D(p->level++);
     if (p->error_indicator) {
@@ -23874,7 +24108,7 @@
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _tmp_147[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "star_targets '='"));
+        D(fprintf(stderr, "%*c> _tmp_149[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "star_targets '='"));
         Token * _literal;
         expr_ty star_targets_var;
         if (
@@ -23883,12 +24117,12 @@
             (_literal = _PyPegen_expect_token(p, 22))  // token='='
         )
         {
-            D(fprintf(stderr, "%*c+ _tmp_147[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "star_targets '='"));
+            D(fprintf(stderr, "%*c+ _tmp_149[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "star_targets '='"));
             _res = _PyPegen_dummy_name(p, star_targets_var, _literal);
             goto done;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_147[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _tmp_149[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "star_targets '='"));
     }
     _res = NULL;
@@ -23897,9 +24131,9 @@
     return _res;
 }
 
-// _tmp_148: star_targets '='
+// _tmp_150: star_targets '='
 static void *
-_tmp_148_rule(Parser *p)
+_tmp_150_rule(Parser *p)
 {
     D(p->level++);
     if (p->error_indicator) {
@@ -23913,7 +24147,7 @@
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _tmp_148[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "star_targets '='"));
+        D(fprintf(stderr, "%*c> _tmp_150[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "star_targets '='"));
         Token * _literal;
         expr_ty star_targets_var;
         if (
@@ -23922,12 +24156,12 @@
             (_literal = _PyPegen_expect_token(p, 22))  // token='='
         )
         {
-            D(fprintf(stderr, "%*c+ _tmp_148[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "star_targets '='"));
+            D(fprintf(stderr, "%*c+ _tmp_150[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "star_targets '='"));
             _res = _PyPegen_dummy_name(p, star_targets_var, _literal);
             goto done;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_148[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _tmp_150[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "star_targets '='"));
     }
     _res = NULL;
@@ -23936,9 +24170,9 @@
     return _res;
 }
 
-// _loop1_149: param_with_default
+// _loop1_151: param_with_default
 static asdl_seq *
-_loop1_149_rule(Parser *p)
+_loop1_151_rule(Parser *p)
 {
     D(p->level++);
     if (p->error_indicator) {
@@ -23962,7 +24196,7 @@
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _loop1_149[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "param_with_default"));
+        D(fprintf(stderr, "%*c> _loop1_151[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "param_with_default"));
         NameDefaultPair* param_with_default_var;
         while (
             (param_with_default_var = param_with_default_rule(p))  // param_with_default
@@ -23984,7 +24218,7 @@
             _mark = p->mark;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _loop1_149[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _loop1_151[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "param_with_default"));
     }
     if (_n == 0 || p->error_indicator) {
@@ -24002,14 +24236,85 @@
     }
     for (int i = 0; i < _n; i++) asdl_seq_SET(_seq, i, _children[i]);
     PyMem_Free(_children);
-    _PyPegen_insert_memo(p, _start_mark, _loop1_149_type, _seq);
+    _PyPegen_insert_memo(p, _start_mark, _loop1_151_type, _seq);
     D(p->level--);
     return _seq;
 }
 
-// _tmp_150: ')' | '**'
+// _loop1_152: lambda_param_with_default
+static asdl_seq *
+_loop1_152_rule(Parser *p)
+{
+    D(p->level++);
+    if (p->error_indicator) {
+        D(p->level--);
+        return NULL;
+    }
+    void *_res = NULL;
+    int _mark = p->mark;
+    int _start_mark = p->mark;
+    void **_children = PyMem_Malloc(sizeof(void *));
+    if (!_children) {
+        p->error_indicator = 1;
+        PyErr_NoMemory();
+        D(p->level--);
+        return NULL;
+    }
+    ssize_t _children_capacity = 1;
+    ssize_t _n = 0;
+    { // lambda_param_with_default
+        if (p->error_indicator) {
+            D(p->level--);
+            return NULL;
+        }
+        D(fprintf(stderr, "%*c> _loop1_152[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "lambda_param_with_default"));
+        NameDefaultPair* lambda_param_with_default_var;
+        while (
+            (lambda_param_with_default_var = lambda_param_with_default_rule(p))  // lambda_param_with_default
+        )
+        {
+            _res = lambda_param_with_default_var;
+            if (_n == _children_capacity) {
+                _children_capacity *= 2;
+                void **_new_children = PyMem_Realloc(_children, _children_capacity*sizeof(void *));
+                if (!_new_children) {
+                    p->error_indicator = 1;
+                    PyErr_NoMemory();
+                    D(p->level--);
+                    return NULL;
+                }
+                _children = _new_children;
+            }
+            _children[_n++] = _res;
+            _mark = p->mark;
+        }
+        p->mark = _mark;
+        D(fprintf(stderr, "%*c%s _loop1_152[%d-%d]: %s failed!\n", p->level, ' ',
+                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "lambda_param_with_default"));
+    }
+    if (_n == 0 || p->error_indicator) {
+        PyMem_Free(_children);
+        D(p->level--);
+        return NULL;
+    }
+    asdl_seq *_seq = _Py_asdl_seq_new(_n, p->arena);
+    if (!_seq) {
+        PyMem_Free(_children);
+        p->error_indicator = 1;
+        PyErr_NoMemory();
+        D(p->level--);
+        return NULL;
+    }
+    for (int i = 0; i < _n; i++) asdl_seq_SET(_seq, i, _children[i]);
+    PyMem_Free(_children);
+    _PyPegen_insert_memo(p, _start_mark, _loop1_152_type, _seq);
+    D(p->level--);
+    return _seq;
+}
+
+// _tmp_153: ')' | '**'
 static void *
-_tmp_150_rule(Parser *p)
+_tmp_153_rule(Parser *p)
 {
     D(p->level++);
     if (p->error_indicator) {
@@ -24023,18 +24328,18 @@
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _tmp_150[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "')'"));
+        D(fprintf(stderr, "%*c> _tmp_153[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "')'"));
         Token * _literal;
         if (
             (_literal = _PyPegen_expect_token(p, 8))  // token=')'
         )
         {
-            D(fprintf(stderr, "%*c+ _tmp_150[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "')'"));
+            D(fprintf(stderr, "%*c+ _tmp_153[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "')'"));
             _res = _literal;
             goto done;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_150[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _tmp_153[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "')'"));
     }
     { // '**'
@@ -24042,18 +24347,18 @@
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _tmp_150[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'**'"));
+        D(fprintf(stderr, "%*c> _tmp_153[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'**'"));
         Token * _literal;
         if (
             (_literal = _PyPegen_expect_token(p, 35))  // token='**'
         )
         {
-            D(fprintf(stderr, "%*c+ _tmp_150[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'**'"));
+            D(fprintf(stderr, "%*c+ _tmp_153[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'**'"));
             _res = _literal;
             goto done;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_150[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _tmp_153[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'**'"));
     }
     _res = NULL;
@@ -24062,9 +24367,9 @@
     return _res;
 }
 
-// _tmp_151: ':' | '**'
+// _tmp_154: ':' | '**'
 static void *
-_tmp_151_rule(Parser *p)
+_tmp_154_rule(Parser *p)
 {
     D(p->level++);
     if (p->error_indicator) {
@@ -24078,18 +24383,18 @@
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _tmp_151[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "':'"));
+        D(fprintf(stderr, "%*c> _tmp_154[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "':'"));
         Token * _literal;
         if (
             (_literal = _PyPegen_expect_token(p, 11))  // token=':'
         )
         {
-            D(fprintf(stderr, "%*c+ _tmp_151[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "':'"));
+            D(fprintf(stderr, "%*c+ _tmp_154[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "':'"));
             _res = _literal;
             goto done;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_151[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _tmp_154[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "':'"));
     }
     { // '**'
@@ -24097,18 +24402,18 @@
             D(p->level--);
             return NULL;
         }
-        D(fprintf(stderr, "%*c> _tmp_151[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'**'"));
+        D(fprintf(stderr, "%*c> _tmp_154[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'**'"));
         Token * _literal;
         if (
             (_literal = _PyPegen_expect_token(p, 35))  // token='**'
         )
         {
-            D(fprintf(stderr, "%*c+ _tmp_151[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'**'"));
+            D(fprintf(stderr, "%*c+ _tmp_154[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'**'"));
             _res = _literal;
             goto done;
         }
         p->mark = _mark;
-        D(fprintf(stderr, "%*c%s _tmp_151[%d-%d]: %s failed!\n", p->level, ' ',
+        D(fprintf(stderr, "%*c%s _tmp_154[%d-%d]: %s failed!\n", p->level, ' ',
                   p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'**'"));
     }
     _res = NULL;