Add test for SystemError not being chained in _maybe_compile

Author: johnslavik

Lib/test/test_codeop.py

@@ -325,6 +325,14 @@ def foo(x,x):
                    pass
             """), "duplicate parameter 'x' in function definition")
 
+    def test_system_error_not_chained(self):
+        system_error = SystemError("compiler bug")
+        compiler = Mock(side_effect=[_IncompleteInputError("incomplete"), system_error])
+        with self.assertRaises(SystemError) as cm:
+            _maybe_compile(compiler, "x", "<input>", "single", flags=0)
+        self.assertIs(cm.exception, system_error)
+        self.assertTrue(cm.exception.__suppress_context__)
+
 
 if __name__ == "__main__":
     unittest.main()