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4.4.1.2 '\tracingcharsubdef': Substitution diagnostics
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To help diagnose problems with '\charsubdef', MLTeX provides a new
primitive parameter, '\tracingcharsubdef'.  If positive, every use of
'\charsubdef' will be reported.  This can help track down when a
character is redefined.

   In addition, if the TeX parameter '\tracinglostchars' is 100 or more,
the character substitutions actually performed at '\shipout'-time will
be recorded.