- * If this fails, you may need to fix something in regen/op_private */
- if (o->op_ppaddr == PL_ppaddr[o->op_type]) {
+ * If this fails, you may need to fix something in regen/op_private.
+ * Don't bother testing if:
+ * * the op_ppaddr doesn't match the op; someone may have
+ * overridden the op and be doing strange things with it;
+ * * we've errored, as op flags are often left in an
+ * inconsistent state then. Note that an error when
+ * compiling the main program leaves PL_parser NULL, so
+ * we can't spot faults in the main code, only
+ * evaled/required code */
+#ifdef DEBUGGING
+ if ( o->op_ppaddr == PL_ppaddr[o->op_type]
+ && PL_parser
+ && !PL_parser->error_count)
+ {