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M4sugar provides a means to define suspicious patterns, patterns describing tokens which should not be found in the output. For instance, if an Autoconf `configure' script includes tokens such as `AC_DEFINE', or `dnl', then most probably something went wrong (typically a macro was not evaluated because of overquotation).
M4sugar forbids all the tokens matching `^m4_' and `^dnl$'.
Of course, you might encounter exceptions to these generic rules, for instance you might have to refer to `$m4_flags'.
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