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`\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.