diff --git a/include/etl/generators/message_packet_generator.h b/include/etl/generators/message_packet_generator.h
index f15efb03..354601b9 100644
--- a/include/etl/generators/message_packet_generator.h
+++ b/include/etl/generators/message_packet_generator.h
@@ -88,13 +88,13 @@ namespace etl
   private:
 
     template <typename T>
-    static constexpr bool IsMessagePacket = etl::is_same_v< etl::remove_const_t<etl::remove_reference_t<T>>, etl::message_packet<TMessageTypes...>>;
+    static constexpr bool IsMessagePacket = etl::is_same_v<etl::remove_const_t<etl::remove_reference_t<T>>, etl::message_packet<TMessageTypes...>>;
 
     template <typename T>
     static constexpr bool IsInMessageList = etl::is_one_of_v<etl::remove_const_t<etl::remove_reference_t<T>>, TMessageTypes...>;
 
     template <typename T>
-    static constexpr bool IsIMessage = etl::is_same_v<remove_const_t<etl::remove_reference_t<T>>, etl::imessage>;
+    static constexpr bool IsIMessage = etl::is_same_v<etl::remove_const_t<etl::remove_reference_t<T>>, etl::imessage>;
 
   public:
 
@@ -102,7 +102,7 @@ namespace etl
 
     //********************************************
 #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    constexpr message_packet() noexcept
       : valid(false)
     {
     }
@@ -403,14 +403,14 @@ namespace etl
   {
   private:
 
-    //template <typename T>
-    //static constexpr bool IsMessagePacket = etl::is_same_v< etl::remove_const_t<etl::remove_reference_t<T>>, etl::message_packet<TMessageTypes...>>;
+    template <typename T>
+    static constexpr bool IsMessagePacket = etl::is_same_v<etl::remove_const_t<etl::remove_reference_t<T>>, etl::message_packet<TMessageTypes...>>;
 
     template <typename T>
     static constexpr bool IsInMessageList = false;
 
     template <typename T>
-    static constexpr bool IsIMessage = etl::is_same_v<remove_const_t<etl::remove_reference_t<T>>, etl::imessage>;
+    static constexpr bool IsIMessage = etl::is_same_v<etl::remove_const_t<etl::remove_reference_t<T>>, etl::imessage>;
 
   public:
 
@@ -418,7 +418,7 @@ namespace etl
 
     //********************************************
 #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    constexpr message_packet() noexcept
     {
     }
 #include "private/diagnostic_pop.h"
@@ -620,7 +620,7 @@ namespace etl
 
     cog.outl("  //********************************************")
     cog.outl("#include \"private/diagnostic_uninitialized_push.h\"")
-    cog.outl("  message_packet()")
+    cog.outl("  ETL_CONSTEXPR message_packet() ETL_NOEXCEPT")
     cog.outl("    : valid(false)")
     cog.outl("  {")
     cog.outl("  }")
@@ -934,7 +934,7 @@ namespace etl
 
         cog.outl("  //********************************************")
         cog.outl("#include \"private/diagnostic_uninitialized_push.h\"")
-        cog.outl("  message_packet()")
+        cog.outl("  ETL_CONSTEXPR message_packet() ETL_NOEXCEPT")
         cog.outl("    : valid(false)")
         cog.outl("  {")
         cog.outl("  }")
@@ -1219,7 +1219,7 @@ namespace etl
     using message_types = etl::type_list<>;
 #endif
 
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
diff --git a/include/etl/generators/message_router_generator.h b/include/etl/generators/message_router_generator.h
index 1f8e19da..02140088 100644
--- a/include/etl/generators/message_router_generator.h
+++ b/include/etl/generators/message_router_generator.h
@@ -623,7 +623,7 @@ namespace etl
     //**********************************************
     using imessage_router::accepts;
 
-    bool accepts(etl::message_id_t /*id*/) const ETL_OVERRIDE
+    bool accepts(etl::message_id_t id) const ETL_OVERRIDE
     {
       if (has_successor())
       {
diff --git a/include/etl/message_packet.h b/include/etl/message_packet.h
index 9c6f5eb1..a097d55c 100644
--- a/include/etl/message_packet.h
+++ b/include/etl/message_packet.h
@@ -76,13 +76,13 @@ namespace etl
   private:
 
     template <typename T>
-    static constexpr bool IsMessagePacket = etl::is_same_v< etl::remove_const_t<etl::remove_reference_t<T>>, etl::message_packet<TMessageTypes...>>;
+    static constexpr bool IsMessagePacket = etl::is_same_v<etl::remove_const_t<etl::remove_reference_t<T>>, etl::message_packet<TMessageTypes...>>;
 
     template <typename T>
     static constexpr bool IsInMessageList = etl::is_one_of_v<etl::remove_const_t<etl::remove_reference_t<T>>, TMessageTypes...>;
 
     template <typename T>
-    static constexpr bool IsIMessage = etl::is_same_v<remove_const_t<etl::remove_reference_t<T>>, etl::imessage>;
+    static constexpr bool IsIMessage = etl::is_same_v<etl::remove_const_t<etl::remove_reference_t<T>>, etl::imessage>;
 
   public:
 
@@ -90,7 +90,7 @@ namespace etl
 
     //********************************************
 #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    constexpr message_packet() noexcept
       : valid(false)
     {
     }
@@ -391,14 +391,14 @@ namespace etl
   {
   private:
 
-    //template <typename T>
-    //static constexpr bool IsMessagePacket = etl::is_same_v< etl::remove_const_t<etl::remove_reference_t<T>>, etl::message_packet<TMessageTypes...>>;
+    template <typename T>
+    static constexpr bool IsMessagePacket = etl::is_same_v<etl::remove_const_t<etl::remove_reference_t<T>>, etl::message_packet<TMessageTypes...>>;
 
     template <typename T>
     static constexpr bool IsInMessageList = false;
 
     template <typename T>
-    static constexpr bool IsIMessage = etl::is_same_v<remove_const_t<etl::remove_reference_t<T>>, etl::imessage>;
+    static constexpr bool IsIMessage = etl::is_same_v<etl::remove_const_t<etl::remove_reference_t<T>>, etl::imessage>;
 
   public:
 
@@ -406,7 +406,7 @@ namespace etl
 
     //********************************************
 #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    constexpr message_packet() noexcept
     {
     }
 #include "private/diagnostic_pop.h"
@@ -528,7 +528,7 @@ namespace etl
 
     //********************************************
   #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
@@ -856,7 +856,7 @@ namespace etl
 
     //********************************************
   #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
@@ -1182,7 +1182,7 @@ namespace etl
 
     //********************************************
   #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
@@ -1505,7 +1505,7 @@ namespace etl
 
     //********************************************
   #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
@@ -1824,7 +1824,7 @@ namespace etl
 
     //********************************************
   #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
@@ -2137,7 +2137,7 @@ namespace etl
 
     //********************************************
   #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
@@ -2447,7 +2447,7 @@ namespace etl
 
     //********************************************
   #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
@@ -2754,7 +2754,7 @@ namespace etl
 
     //********************************************
   #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
@@ -3057,7 +3057,7 @@ namespace etl
 
     //********************************************
   #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
@@ -3354,7 +3354,7 @@ namespace etl
 
     //********************************************
   #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
@@ -3648,7 +3648,7 @@ namespace etl
 
     //********************************************
   #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
@@ -3939,7 +3939,7 @@ namespace etl
 
     //********************************************
   #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
@@ -4226,7 +4226,7 @@ namespace etl
 
     //********************************************
   #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
@@ -4507,7 +4507,7 @@ namespace etl
 
     //********************************************
   #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
@@ -4785,7 +4785,7 @@ namespace etl
 
     //********************************************
   #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
@@ -5060,7 +5060,7 @@ namespace etl
 
     //********************************************
   #include "private/diagnostic_uninitialized_push.h"
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
@@ -5331,7 +5331,7 @@ namespace etl
     using message_types = etl::type_list<>;
 #endif
 
-    message_packet()
+    ETL_CONSTEXPR message_packet() ETL_NOEXCEPT
       : valid(false)
     {
     }
diff --git a/include/etl/message_router.h b/include/etl/message_router.h
index 42735ab0..b53d9071 100644
--- a/include/etl/message_router.h
+++ b/include/etl/message_router.h
@@ -611,7 +611,7 @@ namespace etl
     //**********************************************
     using imessage_router::accepts;
 
-    bool accepts(etl::message_id_t /*id*/) const ETL_OVERRIDE
+    bool accepts(etl::message_id_t id) const ETL_OVERRIDE
     {
       if (has_successor())
       {
diff --git a/include/etl/type_list.h b/include/etl/type_list.h
index 2d0dcdac..19eddc15 100644
--- a/include/etl/type_list.h
+++ b/include/etl/type_list.h
@@ -59,6 +59,11 @@ namespace etl
   template <typename... TTypes>
   struct is_type_list<etl::type_list<TTypes...>> : etl::true_type {};
 
+#if ETL_USING_CPP17
+  template <typename T>
+  inline constexpr bool is_type_list_v = is_type_list<T>::value;
+#endif
+
   //***************************************************************************
   /// The empty type list.
   //***************************************************************************
diff --git a/test/test_message_router.cpp b/test/test_message_router.cpp
index a6691297..cfe2e9b1 100644
--- a/test/test_message_router.cpp
+++ b/test/test_message_router.cpp
@@ -448,31 +448,6 @@ namespace
       CHECK_EQUAL(1, r1.message4_count);
       CHECK_EQUAL(0, r1.message_unknown_count);
       CHECK_EQUAL(4, r2.callback_count);
-
-      //// Send from the null router.
-      //etl::send_message(r0, message1);
-      //CHECK_EQUAL(1, r2.message1_count);
-      //CHECK_EQUAL(0, r2.message2_count);
-      //CHECK_EQUAL(0, r2.message4_count);
-      //CHECK_EQUAL(0, r2.message_unknown_count);
-
-      //etl::send_message(r0, message2);
-      //CHECK_EQUAL(1, r2.message1_count);
-      //CHECK_EQUAL(1, r2.message2_count);
-      //CHECK_EQUAL(0, r2.message4_count);
-      //CHECK_EQUAL(0, r2.message_unknown_count);
-
-      //etl::send_message(r0, message3);
-      //CHECK_EQUAL(1, r2.message1_count);
-      //CHECK_EQUAL(1, r2.message2_count);
-      //CHECK_EQUAL(0, r2.message4_count);
-      //CHECK_EQUAL(1, r2.message_unknown_count);
-
-      //etl::send_message(r0, message4);
-      //CHECK_EQUAL(1, r2.message1_count);
-      //CHECK_EQUAL(1, r2.message2_count);
-      //CHECK_EQUAL(1, r2.message4_count);
-      //CHECK_EQUAL(1, r2.message_unknown_count);
     }
 
     //*************************************************************************
diff --git a/test/test_type_list.cpp b/test/test_type_list.cpp
index cd53981c..b8124dee 100644
--- a/test/test_type_list.cpp
+++ b/test/test_type_list.cpp
@@ -37,6 +37,24 @@ namespace
 #if ETL_USING_CPP11
   SUITE(test_type_list)
   {
+    //*************************************************************************
+    TEST(test_is_type_list)
+    {
+      using t0 = etl::type_list<>;
+      using t1 = etl::type_list<char, int, uint32_t>;
+      using t2 = int;
+
+      CHECK_TRUE((etl::is_type_list<t0>::value));
+      CHECK_TRUE((etl::is_type_list<t1>::value));
+      CHECK_FALSE((etl::is_type_list<t2>::value));
+
+#if ETL_USING_CPP17
+      CHECK_TRUE((etl::is_type_list_v<t0>));
+      CHECK_TRUE((etl::is_type_list_v<t1>));
+      CHECK_FALSE((etl::is_type_list_v<t2>));
+#endif
+    }
+
     //*************************************************************************
     TEST(test_type_list_select)
     {