diff --git a/example/cpp03/reuse_zone.cpp b/example/cpp03/reuse_zone.cpp
index 57eaed96..127d8ccc 100644
--- a/example/cpp03/reuse_zone.cpp
+++ b/example/cpp03/reuse_zone.cpp
@@ -40,8 +40,11 @@ int main() {
 
     // msgpack array is constructed on z.
     msgpack::object obj = msgpack::unpack(z, ss.str().data(), ss.str().size(), offset);
+    std::cout << obj << std::endl;
     assert(obj.as<std::vector<int> >() == v);
 
     // msgpack str is constructed on z.
-    assert(msgpack::unpack(z, ss.str().data(), ss.str().size(), offset).as<std::string>() == s);
+    std::string const& str = msgpack::unpack(z, ss.str().data(), ss.str().size(), offset).as<std::string>();
+    std::cout << str << std::endl;
+    assert(str == s);
 }
diff --git a/example/cpp11/container.cpp b/example/cpp11/container.cpp
index 770b9996..4a4ea69b 100644
--- a/example/cpp11/container.cpp
+++ b/example/cpp11/container.cpp
@@ -35,9 +35,9 @@ void array() {
 
     msgpack::unpacked und = msgpack::unpack(ss.str().data(), ss.str().size());
     msgpack::object obj = und.get();
-    std::array<int, 5> const& new_a = obj.as<std::array<int, 5>>();
 
-    assert(new_a == a);
+    std::cout << obj << std::endl;
+    assert((obj.as<std::array<int, 5>>()) == a);
 }
 
 void tuple() {
@@ -47,6 +47,8 @@ void tuple() {
 
     auto und = msgpack::unpack(ss.str().data(), ss.str().size());
     auto obj = und.get();
+
+    std::cout << obj << std::endl;
     assert(obj.as<decltype(t)>() == t);
 }
 
@@ -56,7 +58,10 @@ void unordered_map() {
     msgpack::pack(ss, m);
 
     auto und = msgpack::unpack(ss.str().data(), ss.str().size());
-    assert(und.get().as<decltype(m)>() == m);
+    msgpack::object obj = und.get();
+
+    std::cout << obj << std::endl;
+    assert(obj.as<decltype(m)>() == m);
 }
 
 void unordered_set() {
@@ -64,7 +69,11 @@ void unordered_set() {
     std::stringstream ss;
     msgpack::pack(ss, s);
 
-    assert(msgpack::unpack(ss.str().data(), ss.str().size()).get().as<decltype(s)>() == s);
+    auto und = msgpack::unpack(ss.str().data(), ss.str().size());
+    auto obj = und.get();
+
+    std::cout << obj << std::endl;
+    assert(obj.as<decltype(s)>() == s);
 }
 
 void forward_list() {
@@ -73,7 +82,11 @@ void forward_list() {
     std::stringstream ss;
     msgpack::pack(ss, f);
 
-    assert(msgpack::unpack(ss.str().data(), ss.str().size()).get().as<type>() == f);
+    auto und = msgpack::unpack(ss.str().data(), ss.str().size());
+    auto obj = und.get();
+
+    std::cout << obj << std::endl;
+    assert(obj.as<type>() == f);
 }
 
 void combi() {
@@ -91,11 +104,47 @@ void combi() {
     msgpack::pack(ss, f);
 
     std::size_t offset = 0;
-    assert(msgpack::unpack(ss.str().data(), ss.str().size(), offset).get().as<decltype(a)>() == a);
-    assert(msgpack::unpack(ss.str().data(), ss.str().size(), offset).get().as<decltype(t)>() == t);
-    assert(msgpack::unpack(ss.str().data(), ss.str().size(), offset).get().as<decltype(m)>() == m);
-    assert(msgpack::unpack(ss.str().data(), ss.str().size(), offset).get().as<decltype(s)>() == s);
-    assert(msgpack::unpack(ss.str().data(), ss.str().size(), offset).get().as<decltype(f)>() == f);
+    std::cout << "offset: " << offset << std::endl;
+    {
+        auto und = msgpack::unpack(ss.str().data(), ss.str().size(), offset);
+        auto obj = und.get();
+
+        std::cout << obj << std::endl;
+        assert(obj.as<decltype(a)>() == a);
+    }
+    std::cout << "offset: " << offset << std::endl;
+    {
+        auto und = msgpack::unpack(ss.str().data(), ss.str().size(), offset);
+        auto obj = und.get();
+
+        std::cout << obj << std::endl;
+        assert(obj.as<decltype(t)>() == t);
+    }
+    std::cout << "offset: " << offset << std::endl;
+    {
+        auto und = msgpack::unpack(ss.str().data(), ss.str().size(), offset);
+        auto obj = und.get();
+
+        std::cout << obj << std::endl;
+        assert(obj.as<decltype(m)>() == m);
+    }
+    std::cout << "offset: " << offset << std::endl;
+    {
+        auto und = msgpack::unpack(ss.str().data(), ss.str().size(), offset);
+        auto obj = und.get();
+
+        std::cout << obj << std::endl;
+        assert(obj.as<decltype(s)>() == s);
+    }
+    std::cout << "offset: " << offset << std::endl;
+    {
+        auto und = msgpack::unpack(ss.str().data(), ss.str().size(), offset);
+        auto obj = und.get();
+
+        std::cout << obj << std::endl;
+        assert(obj.as<decltype(f)>() == f);
+    }
+    std::cout << "offset: " << offset << std::endl;
 }
 
 int main() {
diff --git a/example/cpp11/non_def_con_class.cpp b/example/cpp11/non_def_con_class.cpp
index a7150908..4772eecc 100644
--- a/example/cpp11/non_def_con_class.cpp
+++ b/example/cpp11/non_def_con_class.cpp
@@ -17,6 +17,7 @@
 
 #include <cassert>
 #include <memory>
+#include <iostream>
 
 #include <msgpack.hpp>
 
@@ -53,6 +54,6 @@ int main() {
     my m1(42);
     msgpack::zone z;
     msgpack::object obj(m1, z);
-    auto m2 = obj.as<my>();
-    assert(m1.a == m2.a);
+    std::cout << obj << std::endl;
+    assert(m1.a == obj.as<my>().a);
 }