fix: internal transition is not overwritten by parent internal transi…

…tion (#160)

include/hsm/details/fill_dispatch_table.h

@@ -120,7 +120,7 @@ constexpr auto addDispatchTableEntryOfSubMachineExits(
     (void)optionalDependency;
 
     if constexpr (transition.internal()) {
-        static_assert(transition.internal());
+        return;
     }
 
     constexpr auto parentState = transition.source();

include/hsm/details/flatten_internal_transition_table.h

@@ -28,7 +28,7 @@ constexpr auto isNotEmpty
     = [](const auto& tuple) { return bh::not_(bh::equal(bh::size_c<0>, bh::size(tuple))); };
 
 /**
- * Returns a typle of internal transitions of a state if it exists.
+ * Returns a tuple of internal transitions of a state if it exists.
  * Otherwise a empty tuple is returned. Source and target of the
  * transition are set to parentstate as a placeholder and need to
  * be filled with all child states of the particular state.

test/integration/internal_transition.cpp

@@ -67,6 +67,8 @@ const auto fail = [](auto /*event*/, auto /*source*/, auto /*target*/) { return
 // Actions
 const auto action = [](auto event, auto /*source*/, auto /*target*/) { event.called->set_value(); };
 
+const auto error = [](auto /*event*/, auto /*source*/, auto /*target*/) { EXPECT_TRUE(false); };
+
 using namespace ::testing;
 using namespace boost::hana;
 
@@ -113,7 +115,7 @@ struct MainState {
             + (hsm::event<e2> / action),
             + (hsm::event<e5> [fail] / hsm::log),
             + (hsm::event<e4> [fail] / action),
-            + (hsm::event<e8> / hsm::log),
+            + (hsm::event<e8> / hsm::chain(hsm::log, error)),
             + (hsm::event<e9>)
         );
         // clang-format on