 of substitution are disabled
by default in the case of units (normally they are on) since this situation
occurs frequently and the warnings clutter the output.  (The existing state of
ratprint is restored after unit conversions, so user changes to that setting
will be preserved otherwise.)  If  the user needs this information for units,
they can set <em>unitverbose:on</em> to reactivate the printing of warnings from
the unit conversion process.
</p>
<p><em>unit</em> is included in Maxima in the share/contr