Check for empty deck.

diff --git a/mad b/mad
index b3169302d60376db98235723800ff88a87eea776..5b7aa7497830ac824a9e6597604101fec5eda22c 100755 (executable)
--- a/mad
+++ b/mad
@@ -676,6 +676,10 @@ if __name__ == '__main__':
         # Parse
         yacc.parse(source, debug=mad_debug)
 
+    if not deck:
+        sys.stderr.write("mad: empty deck\n")
+        sys.exit(1)
+
     # Perform global analysis
     analyze()