CI failure: Recursion while initializing class variables and/or constants

[straight-shoota]

This random CI failure happened in x86_64-windows-test: https://github.com/crystal-lang/crystal/actions/runs/10741662759/job/29793143971

  1) IO::FileDescriptor opens STDERR in binary mode
     Failure/Error: io.to_s.should eq("foo\n")

       Expected: "foo\n"
            got: "Unhandled exception: Recursion while initializing class variables and/or constants (Exception)\n" +
       "  from src\\raise.cr:219 in 'raise'\n" +
       "  from src\\raise.cr:244 in 'raise'\n" +
       "  from src\\crystal\\once.cr:21 in 'once'\n" +
       "  from src\\crystal\\once.cr:50 in '__crystal_once'\n" +
       "  from src\\crystal\\system\\win32\\fiber.cr:11 in '__crystal_main'\n" +
       "  from src\\crystal\\main.cr:118 in 'main_user_code'\n" +
       "  from src\\crystal\\main.cr:104 in 'main'\n" +
       "  from src\\crystal\\main.cr:130 in 'main'\n" +
       "  from src\\crystal\\system\\win32\\wmain.cr:37 in 'wmain'\n" +
       "  from D:\\a\\_work\\1\\s\\src\\vctools\\crt\\vcstartup\\src\\startup\\exe_common.inl:288 in '__scrt_common_main_seh'\n" +
       "  from C:\\Windows\\System32\\KERNEL32.DLL +85168 in 'BaseThreadInitThunk'\n" +
       "  from C:\\Windows\\SYSTEM32\\ntdll.dll +519403 in 'RtlUserThreadStart'\n"

     # spec\std\io\file_descriptor_spec.cr:106

I haven't found any repeated occurences yet, so this might just be a fluke. But it seems like a very odd thing to fail and could indicate an issue in the initialization logic.