Test for BufWritePre autocommand that deletes or unloads the buffer. STARTTEST:so small.vim:au BufWritePre Xxx1 bunload:au BufWritePre Xxx2 bwipe/^start ofA1:.,/end of/w! Xxx1  " write test file Xxx1$r2:.,/end of/w! Xxx2   " write test file Xxx2:e! Xxx2                " edit Xxx2:bdel test8.in		" delete this file from the buffer list:e Xxx1                 " edit Xxx1:w                      " write it, will unload it and give an error msg:w! test.out            " Write contents of this file:e! Xxx2                " start editing Xxx2:bwipe test.out         " remove test.out from the buffer list:w                      " write it, will delete the buffer and give an error msg:w >>test.out           " Append contents of this file:qa!ENDTEST start of Xxx	testend of Xxx