bpo-30858: Improve error location for expressions with assignments (GH-23753)

Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>

2 files changed, 8 insertions, 1 deletions

diff --git a/Lib/test/test_exceptions.py b/Lib/test/test_exceptions.py
index 1bdd3f2ce5..e752ab72cc 100644
--- a/Lib/test/test_exceptions.py
+++ b/Lib/test/test_exceptions.py
@@ -252,7 +252,7 @@ class ExceptionTests(unittest.TestCase):
         check('from __future__ import doesnt_exist', 1, 1)
         check('from __future__ import braces', 1, 1)
         check('x=1\nfrom __future__ import division', 2, 1)
-        check('foo(1=2)', 1, 5)
+        check('foo(1=2)', 1, 6)
         check('def f():\n  x, y: int', 2, 3)
         check('[*x for x in xs]', 1, 2)
         check('foo(x for x in range(10), 100)', 1, 5)
diff --git a/Lib/test/test_syntax.py b/Lib/test/test_syntax.py
index 91ca1db43a..d8255607dc 100644
--- a/Lib/test/test_syntax.py
+++ b/Lib/test/test_syntax.py
@@ -802,6 +802,13 @@ class SyntaxTestCase(unittest.TestCase):
         else:
             self.fail("compile() did not raise SyntaxError")
 
+    def test_expression_with_assignment(self):
+        self._check_error(
+            "print(end1 + end2 = ' ')",
+            'expression cannot contain assignment, perhaps you meant "=="?',
+            offset=19
+        )
+
     def test_curly_brace_after_primary_raises_immediately(self):
         self._check_error("f{", "invalid syntax", mode="single")