1 files changed, 5 insertions, 0 deletions
diff --git a/mutator.cpp b/mutator.cpp
index f799809..3af8e2b 100644
--- a/mutator.cpp
+++ b/mutator.cpp
@@ -5,6 +5,7 @@
 /*standard library*/
 #include <string>
 #include <iostream>
+#include <cassert>
 /*LLVM-libs*/
 #include "clang/AST/AST.h"
 #include "clang/AST/ASTConsumer.h"
@@ -60,6 +61,10 @@ public:
       /*replace it.*/
       Rewrite.ReplaceText(BinOpSL, 2U , "XXX");
     }
+    else
+    {
+      std::cout << "the macther -binopeq- returned nullptr!" << std::endl;
+    }
   }
 
 private: