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+dnl @ ../doc/m4.texinfo:969: 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
+changequote(`[', `]')dnl
+syscmd([echo | ']__program__[' >&-])dnl
+dnl @error{}m4: write error: Bad file descriptor
+sysval
+dnl @result{}1