From 21531c5ddb969e8a5bc63a8cd1d924c6ada7accb Mon Sep 17 00:00:00 2001
From: "alexey.lysiuk" <alexey.lysiuk@gmail.com>
Date: Thu, 10 Jan 2019 13:05:35 +0200
Subject: [PATCH] - unary minus operator propagates boolean operand to integer

https://forum.zdoom.org/viewtopic.php?t=63214
---
 src/scripting/backend/codegen.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/scripting/backend/codegen.cpp b/src/scripting/backend/codegen.cpp
index 72de1b6b33..02aadc01fa 100644
--- a/src/scripting/backend/codegen.cpp
+++ b/src/scripting/backend/codegen.cpp
@@ -1881,6 +1881,12 @@ FxExpression *FxMinusSign::Resolve(FCompileContext& ctx)
 			delete this;
 			return e;
 		}
+		else if (Operand->ValueType == TypeBool)
+		{
+			Operand = new FxIntCast(Operand, true);
+			Operand = Operand->Resolve(ctx);
+			assert(Operand != nullptr);
+		}
 		ValueType = Operand->ValueType;
 		return this;
 	}