bpo-40334: PEP 617 implementation: New PEG parser for CPython (GH-19503)

Co-authored-by: Guido van Rossum <guido@python.org>
Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>

1 files changed, 18 insertions, 11 deletions

diff --git a/Lib/test/test_positional_only_arg.py b/Lib/test/test_positional_only_arg.py
index 0a9503e..3326900 100644
--- a/Lib/test/test_positional_only_arg.py
+++ b/Lib/test/test_positional_only_arg.py
@@ -3,6 +3,7 @@
 import dis
 import pickle
 import unittest
+import sys
 
 from test.support import check_syntax_error
 
@@ -23,10 +24,12 @@ class PositionalOnlyTestCase(unittest.TestCase):
             compile(codestr + "\n", "<test>", "single")
 
     def test_invalid_syntax_errors(self):
-        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")
+        if not sys.flags.use_peg:
+            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")
@@ -44,10 +47,12 @@ class PositionalOnlyTestCase(unittest.TestCase):
         check_syntax_error(self, "def f(a, *, c, /, d, e): pass")
 
     def test_invalid_syntax_errors_async(self):
-        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")
+        if not sys.flags.use_peg:
+            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")
@@ -231,9 +236,11 @@ class PositionalOnlyTestCase(unittest.TestCase):
         self.assertEqual(x(1, 2), 3)
 
     def test_invalid_syntax_lambda(self):
-        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")
+        if not sys.flags.use_peg:
+            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")