Major fixes and new features

venv/lib/python3.12/site-packages/pyflakes/test/test_builtin.py

@@ -0,0 +1,30 @@
+"""
+Tests for detecting redefinition of builtins.
+"""
+from pyflakes import messages as m
+from pyflakes.test.harness import TestCase
+
+
+class TestBuiltins(TestCase):
+
+    def test_builtin_unbound_local(self):
+        self.flakes('''
+        def foo():
+            a = range(1, 10)
+            range = a
+            return range
+
+        foo()
+
+        print(range)
+        ''', m.UndefinedLocal)
+
+    def test_global_shadowing_builtin(self):
+        self.flakes('''
+        def f():
+            global range
+            range = None
+            print(range)
+
+        f()
+        ''')