diff --git a/CMakeLists.txt b/CMakeLists.txt
index 42d3f2b..0dcb9c3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@
 cmake_minimum_required(VERSION 3.15.2)
 project(python_interpreter)
 set(CMAKE_CXX_STANDARD 17)
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -fsanitize=address")
 
 include_directories(/usr/include/antlr4-runtime/)
 include_directories(
diff --git a/src/Evalvisitor.cpp b/src/Evalvisitor.cpp
index 757b8e8..7d0d3a8 100644
--- a/src/Evalvisitor.cpp
+++ b/src/Evalvisitor.cpp
@@ -184,6 +184,7 @@ std::any EvalVisitor::visitContinue_stmt(
 std::any EvalVisitor::visitReturn_stmt(Python3Parser::Return_stmtContext *ctx) {
   if (!ctx->testlist()) return FlowType(RETURN, std::vector<std::any>());
   std::any val = visitTestlist(ctx->testlist());
+  val = DeQuate(val, Variables);
   std::vector<std::any> *val_ptr = std::any_cast<std::vector<std::any>>(&val);
   if (val_ptr) return FlowType(RETURN, *val_ptr);
   std::vector<std::any> tmp;
diff --git a/src/names.cpp b/src/names.cpp
index 79747ff..bfdfcbe 100644
--- a/src/names.cpp
+++ b/src/names.cpp
@@ -15,7 +15,7 @@ std::any VariableContainer::ReadVariable(const std::string &name) {
     if (top.find(name) != top.end()) return top[name];
   }
   if (GlobalScope.find(name) != GlobalScope.end()) return GlobalScope[name];
-  throw InterpretException(("ReadVariable: " + name + " not found").c_str());
+  throw InterpretException(("ReadVariable: not found"));
 }
 void VariableContainer::WriteVariable(const std::string &name,
                                       const std::any &value, bool cover) {