if exist bam-merge-fail rmdir /s /q bam-merge-fail || exit /b !ERRORLEVEL!
git init bam-merge-fail || exit /b !ERRORLEVEL!
cd bam-merge-fail || exit /b !ERRORLEVEL!
echo a>"a file.txt" || exit /b !ERRORLEVEL!
git add "a file.txt" || exit /b !ERRORLEVEL!
git commit -m "added 'a file.txt'" || exit /b !ERRORLEVEL!
echo b>"a file.txt" || exit /b !ERRORLEVEL!
git add "a file.txt" || exit /b !ERRORLEVEL!
git commit -m "diverged b 'a file.txt'" || exit /b !ERRORLEVEL!
git checkout -b c HEAD~ || exit /b !ERRORLEVEL!
echo c>"a file.txt" || exit /b !ERRORLEVEL!
git add "a file.txt" || exit /b !ERRORLEVEL!
git commit -m "diverged c 'a file.txt'"
git checkout master || exit /b !ERRORLEVEL!
git merge c || exit /b !ERRORLEVEL!