`test_dataclass` fails with `-OO` mode

[sobolevn]

Bug report

Output:

» ./python.exe -OO Lib/test/test_dataclasses/__init__.py
.................................................................................................................................F..........................................................................................................
======================================================================
FAIL: test_existing_docstring_not_overridden (__main__.TestDocString.test_existing_docstring_not_overridden)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/sobolev/Desktop/cpython2/Lib/test/test_dataclasses/__init__.py", line 2225, in test_existing_docstring_not_overridden
    self.assertEqual(C.__doc__, "Lorem ipsum")
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: 'C(x: int)' != 'Lorem ipsum'
- C(x: int)
+ Lorem ipsum

I have a PR ready.

Linked PRs

• gh-115285: Fix test_dataclasses with -OO mode #115286
• [3.11] gh-115285: Fix test_dataclasses with -OO mode (GH-115286) #115358
• [3.12] gh-115285: Fix test_dataclasses with -OO mode (GH-115286) #115359

[sobolevn]

This is the last -OO problem I could find 🎉