More verbose eval_const assert message.

eval.cc

@@ -17,7 +17,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #ifdef HAVE_CVS_IDENT
-#ident "$Id: eval.cc,v 1.30 2002/08/12 01:34:59 steve Exp $"
+#ident "$Id: eval.cc,v 1.31 2002/10/13 05:01:07 steve Exp $"
 #endif
 
 # include "config.h"
@@ -143,6 +143,12 @@ verinum* PEIdent::eval_const(const Design*des, const NetScope*scope) const
 	    return 0;
 
       const NetEConst*eval = dynamic_cast<const NetEConst*>(expr);
+      if (eval == 0) {
+	    cerr << get_line() << ": internal error: Unable to evaluate "
+		 << "constant expression: " << *expr << endl;
+	    return 0;
+      }
+
       assert(eval);
 
       if (msb_ || lsb_)
@@ -219,6 +225,9 @@ verinum* PEUnary::eval_const(const Design*des, const NetScope*scope) const
 
 /*
  * $Log: eval.cc,v $
+ * Revision 1.31  2002/10/13 05:01:07  steve
+ *  More verbose eval_const assert message.
+ *
  * Revision 1.30  2002/08/12 01:34:59  steve
  *  conditional ident string using autoconfig.
  *