Bug 735037 - QGDict::hashAsciiKey: Invalid null key

src/pre.l

@@ -3024,10 +3024,17 @@ void preprocessFile(const char *fileName,BufStr &input,BufStr &output)
 	int i=i_obrace+1,p,l,count=0;
 	// gather the formal arguments in a dictionary 
 	while (i<i_cbrace && (p=reId.match(ds,i,&l)))
+	{
+          if (l>0) // see bug375037
           {
 	    argDict.insert(ds.mid(p,l),new int(count++));
 	    i=p+l;
           }
+          else
+          {
+            i++;
+          }
+	}
 	// strip definition part
 	QCString tmp=ds.right(ds.length()-i_equals-1);
 	QCString definition;