Added semantic checks for compound expressions.

src/shared/cplusplus/AST.h

@@ -80,6 +80,17 @@ public:
     }
 
     unsigned lastToken() const
+    {
+        _Tp lv = lastValue();
+
+        if (lv)
+            return lv->lastToken();
+
+        // ### assert(0);
+        return 0;
+    }
+
+    _Tp lastValue() const
     {
         _Tp lastValue = 0;
 
@@ -88,11 +99,7 @@ public:
                 lastValue = it->value;
         }
 
-        if (lastValue)
-            return lastValue->lastToken();
-
-        // ### assert(0);
-        return 0;
+        return lastValue;
     }
     
     _Tp value;