Major fixes and new features

venv/lib/python3.12/site-packages/mypy/test/testmypyc.py

@@ -0,0 +1,14 @@
+"""A basic check to make sure that we are using a mypyc-compiled version when expected."""
+
+from __future__ import annotations
+
+import os
+from unittest import TestCase
+
+import mypy
+
+
+class MypycTest(TestCase):
+    def test_using_mypyc(self) -> None:
+        if os.getenv("TEST_MYPYC", None) == "1":
+            assert not mypy.__file__.endswith(".py"), "Expected to find a mypyc-compiled version"