From 08804d8fa26d34851ec641466e4b0b51f9b31192 Mon Sep 17 00:00:00 2001
From: Erik Eckstein <eeckstein@apple.com>
Date: Wed, 15 Oct 2025 19:25:02 +0200
Subject: [PATCH] ExistentialTransform: fix a wrong result type of
 `open_existential_addr`

It needs to be the address type of the opened type and not the object type.
Unfortunately I don't have a test case for this fix.

Fixes a compiler crash
rdar://162149588
---
 .../FunctionSignatureTransforms/ExistentialTransform.cpp        | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/SILOptimizer/FunctionSignatureTransforms/ExistentialTransform.cpp b/lib/SILOptimizer/FunctionSignatureTransforms/ExistentialTransform.cpp
index bd24ee9687a94..6701c2412243c 100644
--- a/lib/SILOptimizer/FunctionSignatureTransforms/ExistentialTransform.cpp
+++ b/lib/SILOptimizer/FunctionSignatureTransforms/ExistentialTransform.cpp
@@ -443,7 +443,7 @@ void ExistentialTransform::populateThunkBody() {
       switch (ExistentialRepr) {
       case ExistentialRepresentation::Opaque: {
         archetypeValue = Builder.createOpenExistentialAddr(
-            Loc, OrigOperand, OpenedSILType, it->second.AccessType);
+            Loc, OrigOperand, OpenedSILType.getAddressType(), it->second.AccessType);
         SILValue calleeArg = archetypeValue;
         if (OriginallyConsumed) {
           // open_existential_addr projects a borrowed address into the