From 0b23446aa8670e8b7433ddd60cccd2f7fc0e3902 Mon Sep 17 00:00:00 2001
From: Brian Fiete <bfiete@gmail.com>
Date: Fri, 22 Jan 2021 14:19:02 -0800
Subject: [PATCH] Added stricter method extension 'this' pre-check

---
 IDEHelper/Compiler/BfExprEvaluator.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/IDEHelper/Compiler/BfExprEvaluator.cpp b/IDEHelper/Compiler/BfExprEvaluator.cpp
index e67e852e..a8d2a101 100644
--- a/IDEHelper/Compiler/BfExprEvaluator.cpp
+++ b/IDEHelper/Compiler/BfExprEvaluator.cpp
@@ -2219,6 +2219,16 @@ NoMatch:
 		if (mBestMethodDef != NULL)
 			return false;
 		
+		if (checkMethod->mMethodType == BfMethodType_Extension)
+		{
+			auto thisParam = methodInstance->GetParamType(0);
+			auto resolveThisParam = mModule->ResolveGenericType(thisParam, NULL, &mCheckMethodGenericArguments);
+			if (resolveThisParam == NULL)
+				return false;
+			if (!mModule->CanCast(mTarget, resolveThisParam))
+				return false;
+		}
+
 		if (mBackupMethodDef != NULL)
 		{
 			int prevParamDiff = (int)mBackupMethodDef->GetExplicitParamCount() - (int)mArguments.size();