Add missing type annotations to the primitives.pyi fixture

[AlexWaygood]

This fixes some weird test failures I was seeing locally when trying to run just the tests in check-enum.test (invoked via pytest mypy/test/testcheck.py::TypeCheckSuite::check-enum.test):

> pytest mypy/test/testcheck.py::TypeCheckSuite::check-enum.test
=================================================================== test session starts ===================================================================
platform win32 -- Python 3.11.2, pytest-7.4.0, pluggy-1.2.0
rootdir: C:\Users\alexw\coding\mypy
configfile: pyproject.toml
plugins: cov-4.1.0, xdist-3.3.1
4 workers [99 items]
............................................................F...F.......F..........................                                                  [100%]
======================================================================== FAILURES =========================================================================
________________________________________________________ testEnumReachabilityWithChainingDisjoint _________________________________________________________
[gw2] win32 -- Python 3.11.2 C:\Users\alexw\coding\mypy\venv\Scripts\python.exe
data: C:\Users\alexw\coding\mypy\test-data\unit\check-enum.test:1174:
Failed: Unexpected type checker output (C:\Users\alexw\coding\mypy\test-data\unit\check-enum.test, line 1174)
------------------------------------------------------------------ Captured stderr call -------------------------------------------------------------------
Expected:
  main:16: note: Revealed type is "Literal[__main__.Foo.A]" (diff)
  main:17: note: Revealed type is "Literal[__main__.Foo.B]" (diff)
  main:21: note: Revealed type is "__main__.Foo" (diff)
  main:22: note: Revealed type is "__main__.Foo" (diff)
  ...
Actual:
  tmp/builtins.pyi:15: error: Function is missing a type annotation for one or more arguments (diff)
  tmp/builtins.pyi:33: error: Function is missing a type annotation for one or more arguments (diff)
  main:16: note: Revealed type is "Literal[__main__.Foo.A]" (diff)
  main:17: note: Revealed type is "Literal[__main__.Foo.B]" (diff)
  main:21: note: Revealed type is "__main__.Foo" (diff)
  main:22: note: Revealed type is "__main__.Foo" (diff)
  ...

Alignment of first line difference:
  E: main:16: note: Revealed type is "Literal[__main__.Foo.A]"...
  A: tmp/builtins.pyi:15: error: Function is missing a type annotation for on...
     ^
_____________________________________________________ testEnumReachabilityWithChainingDirectConflict ______________________________________________________
[gw2] win32 -- Python 3.11.2 C:\Users\alexw\coding\mypy\venv\Scripts\python.exe
data: C:\Users\alexw\coding\mypy\test-data\unit\check-enum.test:1215:
Failed: Unexpected type checker output (C:\Users\alexw\coding\mypy\test-data\unit\check-enum.test, line 1215)
------------------------------------------------------------------ Captured stderr call -------------------------------------------------------------------
Expected:
  main:12: error: Statement is unreachable      (diff)
  main:14: note: Revealed type is "__main__.Foo" (diff)
  main:15: note: Revealed type is "__main__.Foo" (diff)
  main:20: error: Statement is unreachable      (diff)
  ...
Actual:
  tmp/builtins.pyi:15: error: Function is missing a type annotation for one or more arguments (diff)
  tmp/builtins.pyi:33: error: Function is missing a type annotation for one or more arguments (diff)
  main:12: error: Statement is unreachable      (diff)
  main:14: note: Revealed type is "__main__.Foo" (diff)
  main:15: note: Revealed type is "__main__.Foo" (diff)
  main:20: error: Statement is unreachable      (diff)
  ...

Alignment of first line difference:
  E: main:12: error: Statement is unreachable...
  A: tmp/builtins.pyi:15: error: Function is missing a type annotation for on...
     ^
______________________________________________________ testEnumReachabilityWithChainingBigDisjoints _______________________________________________________
[gw2] win32 -- Python 3.11.2 C:\Users\alexw\coding\mypy\venv\Scripts\python.exe
data: C:\Users\alexw\coding\mypy\test-data\unit\check-enum.test:1250:
Failed: Unexpected type checker output (C:\Users\alexw\coding\mypy\test-data\unit\check-enum.test, line 1250)
------------------------------------------------------------------ Captured stderr call -------------------------------------------------------------------
Expected:
  main:20: note: Revealed type is "Literal[__main__.Foo.A]" (diff)
  main:21: note: Revealed type is "Literal[__main__.Foo.A]" (diff)
  main:22: note: Revealed type is "Literal[__main__.Foo.A]" (diff)
  main:24: note: Revealed type is "Literal[__main__.Foo.B]" (diff)
  ...
Actual:
  tmp/builtins.pyi:15: error: Function is missing a type annotation for one or more arguments (diff)
  tmp/builtins.pyi:33: error: Function is missing a type annotation for one or more arguments (diff)
  main:20: note: Revealed type is "Literal[__main__.Foo.A]" (diff)
  main:21: note: Revealed type is "Literal[__main__.Foo.A]" (diff)
  main:22: note: Revealed type is "Literal[__main__.Foo.A]" (diff)
  main:24: note: Revealed type is "Literal[__main__.Foo.B]" (diff)
  ...

Alignment of first line difference:
  E: main:20: note: Revealed type is "Literal[__main__.Foo.A]"...
  A: tmp/builtins.pyi:15: error: Function is missing a type annotation for on...
     ^
================================================================= short test summary info =================================================================
FAILED mypy/test/testcheck.py::TypeCheckSuite::check-enum.test::testEnumReachabilityWithChainingDisjoint
FAILED mypy/test/testcheck.py::TypeCheckSuite::check-enum.test::testEnumReachabilityWithChainingDirectConflict
FAILED mypy/test/testcheck.py::TypeCheckSuite::check-enum.test::testEnumReachabilityWithChainingBigDisjoints
============================================================== 3 failed, 96 passed in 3.85s ===============================================================

I've no idea why this was happening for me locally but not in CI (possibly because I'm invoking the test in a slightly different way??). But, this fixes it -- and it seems like the correct thing to do anyway.

[hauntsaninja]

pytest mypy/test/testcheck.py::TypeCheckSuite::check-enum.test works fine for me, any chance you have a stray mypy config file in the repo or in one of the global locations?

[AlexWaygood]

any chance you have a stray mypy config file in the repo or in one of the global locations?

Lol, yep, that was it. I added loads of random mypy config files everywhere I could think of a few weeks ago to investigate whether python/typeshed#2852 could be closed. Turns out I forgot to delete them again 🤦

Still at least it caught a few missing type annotations in fixtures, I guess? 🙃