diff --git a/examples/run.sh b/examples/run.sh
new file mode 100755
index 0000000..57067cb
--- /dev/null
+++ b/examples/run.sh
@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+
+TOTAL=0
+SUCCESS=0
+
+for file in `find -name "*.zn"`
+do
+    NAME=$(basename $file | cut -d'.' -f1)
+    MSG=$(zarn "$file" 2>&1 > /dev/null)
+
+    STATUS=$?
+
+    echo -en "\e[34m$NAME ... \e[0m"
+    if [ $STATUS -eq 0 ]
+    then
+        echo -e "\e[32mok\e[0m"
+        SUCCESS=$(($SUCCESS + 1))
+    else
+        echo -e "\e[31mko\e[0m"
+        echo "$MSG"
+    fi
+
+    TOTAL=$((TOTAL + 1))
+done
+
+FAILURE=$(($TOTAL - $SUCCESS))
+
+if [ $SUCCESS -eq $TOTAL ]
+then
+    echo -e "\e[32m======== All tests passed ========\e[0m"
+else
+    echo -e "\e[31m======== $FAILURE tests failed ========\e[0m"
+fi
+
+echo -e "\e[0mok:\t$SUCCESS\e[0m"
+echo -e "\e[0mko:\t$FAILURE\e[0m"
+
+if [ $SUCCESS -eq $TOTAL ]
+then
+    echo -e "\e[32mTOTAL:\t$TOTAL\e[0m"
+else
+    echo -e "\e[31mTOTAL:\t$TOTAL\e[0m"
+fi
diff --git a/libstd/macro.cpp b/libstd/macro.cpp
index 41a1188..cafc5e4 100644
--- a/libstd/macro.cpp
+++ b/libstd/macro.cpp
@@ -1,9 +1,9 @@
 #include "macro.hpp"
 
-std::shared_ptr<Constant> assert_fail(Node const& node,
-                                      Compiler& compiler,
-                                      Program& program,
-                                      SymTable& sym)
+void assert_fail(Node const& node,
+                 Compiler& compiler,
+                 Program& program,
+                 SymTable&)
 {
   try
     {
@@ -18,5 +18,7 @@ std::shared_ptr<Constant> assert_fail(Node const& node,
     {
     }
 
-  return std::make_shared<Constant>(TYPE_NIL, node.loc(), 0);
+  size_t addr = program.add_constant(std::make_shared<Constant>
+                                     (TYPE_NIL, node.loc(), 0));
+  program.append(OPCODE_LOAD_CONST, addr);
 }
diff --git a/libstd/macro.hpp b/libstd/macro.hpp
index c342446..e630c0c 100644
--- a/libstd/macro.hpp
+++ b/libstd/macro.hpp
@@ -3,9 +3,9 @@
 
 #include "common.hpp"
 
-std::shared_ptr<Constant> assert_fail(Node const& node,
-                                      Compiler& compiler,
-                                      Program& program,
-                                      SymTable& sym);
+void assert_fail(Node const& node,
+                 Compiler& compiler,
+                 Program& program,
+                 SymTable& sym);
 
 #endif
diff --git a/src/Compiler.cpp b/src/Compiler.cpp
index 1458e2b..c8dd27e 100644
--- a/src/Compiler.cpp
+++ b/src/Compiler.cpp
@@ -57,10 +57,8 @@ namespace zn
               {
                 if (macro->name() == ident)
                   {
-                    auto res = macro->execute(node, *this,
-                                              program, m_sym);
-                    size_t addr = program.add_constant(res);
-                    program.append(OPCODE_LOAD_CONST, addr);
+                    macro->execute(node, *this,
+                                   program, m_sym);
                     found_macro = true;
                     break;
                   }
diff --git a/src/NativeMacro.cpp b/src/NativeMacro.cpp
index 41d012c..6b68eee 100644
--- a/src/NativeMacro.cpp
+++ b/src/NativeMacro.cpp
@@ -13,12 +13,11 @@ namespace zn
   {
   }
 
-  std::shared_ptr<Constant>
-  NativeMacro::execute(Node const& node,
-                       Compiler& compiler,
-                       Program& program,
-                       SymTable& sym)
+  void NativeMacro::execute(Node const& node,
+                            Compiler& compiler,
+                            Program& program,
+                            SymTable& sym)
   {
-    return m_macro(node, compiler, program, sym);
+    m_macro(node, compiler, program, sym);
   }
 }
diff --git a/src/NativeMacro.hpp b/src/NativeMacro.hpp
index 2f7c0f1..1f721ce 100644
--- a/src/NativeMacro.hpp
+++ b/src/NativeMacro.hpp
@@ -9,7 +9,7 @@
 
 namespace zn
 {
-  using native_macro_t = std::function<std::shared_ptr<Constant>
+  using native_macro_t = std::function<void
                                        (Node const&,
                                         Compiler&,
                                         Program&,
@@ -23,11 +23,11 @@ namespace zn
 
     std::string name() const { return m_name; }
 
-    std::shared_ptr<Constant>
-    execute(Node const& node,
-            Compiler& compiler,
-            Program& program,
-            SymTable& sym);
+
+    void execute(Node const& node,
+                 Compiler& compiler,
+                 Program& program,
+                 SymTable& sym);
 
   private:
     std::string m_name;
diff --git a/src/Zarn.cpp b/src/Zarn.cpp
index 592b8dd..e6d3ddd 100644
--- a/src/Zarn.cpp
+++ b/src/Zarn.cpp
@@ -13,10 +13,10 @@ namespace zn
 
   /*virtual*/ Zarn::~Zarn()
   {
-    for (void* handler: m_handlers)
-      {
-        // dlclose(handler);
-      }
+    //for (void* handler: m_handlers)
+    //  {
+    //    // dlclose(handler);
+    //  }
 
     m_handlers.clear();
   }