Any attempt by the code in STRING to use an operator which is not permitted
by the compartment will cause an error (at run-time of the main program
but at compile-time for the code in STRING). The error is of the form
-"%s trapped by operation mask operation...".
+"'%s' trapped by operation mask...".
If an operation is trapped in this way, then the code in STRING will
not be executed. If such a trapped operation occurs or any other