[Bug 57139] New: SET changes errorlevel in .bat files

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57139

Bug ID: 57139
           Summary: SET changes errorlevel in .bat files
           Product: Wine
           Version: 9.16
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: cmd
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

errorlevel was changed to 0 after SET, while Windows CMD keep it unchanged.

Quote from https://stackoverflow.com/a/34968021 and
https://stackoverflow.com/a/148991:

The differences between .CMD and .BAT as far as CMD.EXE is concerned are: With
extensions enabled, PATH/APPEND/PROMPT/SET/ASSOC in .CMD files will set
ERRORLEVEL regardless of error. .BAT sets ERRORLEVEL only on errors.

test.bat:

@echo off

call :SetError

echo %errorlevel%
echo %errorlevel%
SET x=
echo %errorlevel%

exit /B 0

:SetError
exit /B 2