dnl @ ../doc/m4.texi:992: Origin of test
dnl @ expected status: 0
dnl @ extra options: 
dnl @ Copyright (C) 2006, 2007, 2008, 2009 Free Software
dnl @ Foundation, Inc.
dnl @ This file is free software; the Free Software Foundation
dnl @ gives unlimited permission to copy and/or distribute it
dnl @ with or without modifications, as long as this notice
dnl @ is preserved.
dnl @ expected error: ignore
ifdef(`__unix__', ,
      `errprint(` skipping: syscmd does not have unix semantics
')m4exit(`77')')dnl
syscmd(`echo | cat >&- 2>/dev/null')ifelse(sysval, `0',
       `errprint(` skipping: system does not allow closing stdout
')m4exit(`77')')dnl
changequote(`[', `]')dnl
syscmd([echo | ']__program__[' >&-])dnl
dnl @error{}m4: write error: Bad file descriptor
sysval
dnl @result{}1