- added the ability to attach a constructor or destructor to an internally defined struct.

There are a few which require explicit native construction or destruction that need to be exported to the VM, e.g. FCheckPosition.
The VM cannot handle this directly, it needs two special functions to be attached to handle such elements.

src/scripting/thingdef_data.cpp

@@ -50,6 +50,8 @@
 #include "zstring.h"
 #include "d_event.h"
 #include "g_levellocals.h"
+#include "vm.h"
+#include "p_checkposition.h"
 
 static TArray<FPropertyInfo*> properties;
 static TArray<AFuncDesc> AFTable;
@@ -856,6 +858,14 @@ void InitThingdef()
 		qsort(&AFTable[0], AFTable.Size(), sizeof(AFTable[0]), funccmp);
 	}
 
+	// Add the constructor and destructor to FCheckPosition.
+	auto fcp = NewStruct("FCheckPosition", nullptr);
+	fcp->mConstructor = *FindFunction(fcp, "_Constructor")->VMPointer;
+	fcp->mDestructor = *FindFunction(fcp, "_Destructor")->VMPointer;
+	fcp->Size = sizeof(FCheckPosition);
+	fcp->Align = alignof(FCheckPosition);
+
+
 	FieldTable.Clear();
 	if (FieldTable.Size() == 0)
 	{