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dnl @ ../doc/m4.texinfo:3598: Origin of test
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dnl @ Copyright (C) 2006 Free Software Foundation
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dnl @ This file is free software; the Free Software Foundation
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dnl @ gives unlimited permission to copy and/or distribute it
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dnl @ with or without modifications, as long as this notice
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dnl @error{}m4:stdin:1: Warning: too few arguments to builtin `substr'
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dnl @error{}m4:stdin:2: empty string treated as 0 in builtin `substr'