From eec08f0e24dc7d8b280e6b82c3aa5baf10902c44 Mon Sep 17 00:00:00 2001
From: Player701 <{ID}+{username}@users.noreply.github.com>
Date: Fri, 3 Jun 2022 17:02:04 +0300
Subject: [PATCH] - hopefully fixed the "is" operator to work with readonly
 pointers.

---
 src/common/scripting/backend/codegen.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/common/scripting/backend/codegen.cpp b/src/common/scripting/backend/codegen.cpp
index 2fcbef477d..8acbe668ea 100644
--- a/src/common/scripting/backend/codegen.cpp
+++ b/src/common/scripting/backend/codegen.cpp
@@ -277,7 +277,8 @@ bool AreCompatiblePointerTypes(PType *dest, PType *source, bool forcompare)
 		// null pointers can be assigned to everything, everything can be assigned to void pointers.
 		if (fromtype == nullptr || totype == TypeVoidPtr) return true;
 		// when comparing const-ness does not matter.
-		if (!forcompare && totype->IsConst != fromtype->IsConst) return false;
+		// If not comparing, then we should not allow const to be cast away.
+		if (!forcompare && fromtype->IsConst && !totype->IsConst) return false;
 		// A type is always compatible to itself.
 		if (fromtype == totype) return true;
 		// Pointers to different types are only compatible if both point to an object and the source type is a child of the destination type.
@@ -4793,7 +4794,7 @@ FxExpression *FxTypeCheck::Resolve(FCompileContext& ctx)
 	}
 	else
 	{
-		left = new FxTypeCast(left, NewPointer(RUNTIME_CLASS(DObject)), false);
+		left = new FxTypeCast(left, NewPointer(RUNTIME_CLASS(DObject), true), false);
 		ClassCheck = false;
 	}
 	right = new FxClassTypeCast(NewClassPointer(RUNTIME_CLASS(DObject)), right, false);