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+dnl @ ../doc/m4.texinfo:2643: 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.
+define(`s', `builtin(`shift', $@)')dnl
+define(`loop', `ifelse(`$2', `', `-', `$1$2: $0(`$1', s(s($@)))')')dnl
+loop(`1')
+dnl @result{}-
+loop(`1', `2')
+dnl @result{}12: -
+loop(`1', `2', `3')
+dnl @result{}12: 13: -
+loop(`1', `2', `3', `4')
+dnl @result{}12: 13: 14: -
+loop(`1', `2', `3', `4', `5')
+dnl @result{}12: 13: 14: 15: -