Test with 32-bit Python

[mr-c]

Debian does build 32bit (on Linux), and there was a recent regression

This PR would have caught #14633 earlier

No change in total CI time (32 minutes) versus the baseline (33 minutes)

Confirmation that the new CI test catches the previous error is at https://github.com/python/mypy/actions/runs/4174055572/jobs/7227150570#step:7:44

[JukkaL]

Yeah, we should probably continue testing on a 32-bit architecture. Maybe just running mypyc tests would be enough to catch most issues? Windows CI tends to be pretty slow.

[mr-c]

Yeah, we should probably continue testing on a 32-bit architecture. Maybe just running mypyc tests would be enough to catch most issues? Windows CI tends to be pretty slow.

That or cross-compiling to x86 under Linux; whichever works!

[JukkaL]

That or cross-compiling to x86 under Linux; whichever works!

I'm not sure how easy this would be to set up in GitHub actions. We might need to use Docker, which may be too involved. Continuing to use 32-bit Windows may be our best bet, but without running the entire test suite.

[mr-c]

I rebased on top of @JukkaL 's 32-bit test case fixes in 563e29d

There are some failures, but I think they are just from path changes
https://github.com/python/mypy/actions/runs/4172280556/jobs/7223187539#step:8:202

FAILED mypy/test/testfinegrained.py::FineGrainedSuite::fine-grained-suggest.test::testSuggestColonMethodJSON

Alignment of first line difference:
  E: ..., "line": 3, "path": "tmp/foo.py", "samples": 0, "signature": {"arg_t...
  A: ..., "line": 3, "path": "C:/Users/RUNNER~1/AppData/Local/Temp/mypy-test-...
                              ^

FAILED mypyc/test/test_run.py::TestRun::run-loops.test::testForIterable

Alignment of first line difference:
  E:   File "driver.py", line 16, in <module>...
  A:   File "C:\Users\RUNNER~1\AppData\Local\Temp\mypy-test-2afcrxij\tmp\driv...
             ^

FAILED mypyc/test/test_run.py::TestRun::run-exceptions.test::testException

Alignment of first line difference:
  E:   File "driver.py", line 4, in <module>...
  A:   File "C:\Users\RUNNER~1\AppData\Local\Temp\mypy-test-63wapg7j\tmp\driv...
             ^

FAILED mypyc/test/test_run.py::TestRun::run-exceptions.test::testTryExcept

Alignment of first line difference:
  E:   File "driver.py", line 6, in <module>...
  A:   File "C:\Users\RUNNER~1\AppData\Local\Temp\mypy-test-kx2rlobh\tmp\driv...
             ^

FAILED mypyc/test/test_run.py::TestRun::run-exceptions.test::testExceptionAtModuleTopLevel

Alignment of first line difference:
  E:   File "driver.py", line 3, in <module>...
  A:   File "C:\Users\RUNNER~1\AppData\Local\Temp\mypy-test-njz3rjwc\tmp\driv...
             ^

FAILED mypyc/test/test_run.py::TestRun::run-classes.test::testSubclassUninitAttr

 Alignment of first line difference:
  E:   File "driver.py", line 4, in <module>...
  A:   File "C:\Users\RUNNER~1\AppData\Local\Temp\mypy-test-hb3g0dzm\tmp\driv...
             ^

FAILED mypyc/test/test_run.py::TestRun::run-generators.test::testYieldThrow

 Alignment of first line difference:
  E:   File "driver.py", line 31, in <module>...
  A:   File "C:\Users\RUNNER~1\AppData\Local\Temp\mypy-test-voe0j96t\tmp\driv...
             ^

FAILED mypyc/test/test_run.py::TestRun::run-classes.test::testProperty


Alignment of first line difference:
  E:   File "driver.py", line 5, in <module>...
  A:   File "C:\Users\RUNNER~1\AppData\Local\Temp\mypy-test-45xmabsc\tmp\driv...
             ^

FAILED mypyc/test/test_run.py::TestRun::run-multimodule.test::testMultiModuleTraceback

 Alignment of first line difference:
  E:   File "driver.py", line 6, in <module>...
  A:   File "C:\Users\RUNNER~1\AppData\Local\Temp\mypy-test-cacveqm3\tmp\driv...
             ^

FAILED mypyc/test/test_run.py::TestRunMultiFile::run-multimodule.test::testMultiModuleTraceback_multi


Alignment of first line difference:
  E:   File "driver.py", line 6, in <module>...
  A:   File "C:\Users\RUNNER~1\AppData\Local\Temp\mypy-test-_g8qvv4c\tmp\driv...
             ^

FAILED mypyc/test/test_run.py::TestRunSeparate::run-multimodule.test::testMultiModuleTraceback_separate


Alignment of first line difference:
  E:   File "driver.py", line 6, in <module>...
  A:   File "C:\Users\RUNNER~1\AppData\Local\Temp\mypy-test-k8mxhwba\tmp\driv...
             ^

[mr-c]

@JukkaL I added 32-bit Linux testing (instead of MS Windows), updated the description, and marked this PR as ready for review

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

[hauntsaninja]

Thanks!