From 0803faf5961b49be168c933d64089bffaa4d488f Mon Sep 17 00:00:00 2001
From: ZZYZX <zzyzx@virtual>
Date: Thu, 16 Feb 2017 04:22:14 +0200
Subject: [PATCH] Compile time check for abstract class instantiation to reduce
 programming errors ASAP

---
 src/scripting/backend/codegen.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/scripting/backend/codegen.cpp b/src/scripting/backend/codegen.cpp
index 77ac9498c9..1f2b038f17 100644
--- a/src/scripting/backend/codegen.cpp
+++ b/src/scripting/backend/codegen.cpp
@@ -5058,6 +5058,13 @@ FxExpression *FxNew::Resolve(FCompileContext &ctx)
 	if (val->isConstant())
 	{
 		auto cls = static_cast<PClass *>(static_cast<FxConstant*>(val)->GetValue().GetPointer());
+		if ((cls->ObjectFlags & OF_Abstract) && cls != ctx.Class)
+		{
+			ScriptPosition.Message(MSG_ERROR, "Cannot instantiate abstract class %s outside of that class", cls->TypeName.GetChars());
+			delete this;
+			return nullptr;
+		}
+
 		ValueType = NewPointer(cls);
 	}