efault behaviour of <i>StoreError</i> is simply to print the error
messages to <I>System.out</I>.  A more sophisticated system is exemplified in
Coco itself, where the $M pragma or -M command line option employs a
<i>StoreError</i> method that merges the messages into a highlighted source
listing as part of the trace output file <i>listing.txt</i>.

<P>After parsing, the number of syntax and semantic errors detected can be
obtained from <I>Scanner.err.count</I>. If this field is 0 the compilation was
succes