From 75ac27dc3d459382d940583ea594f0bb710fcb15 Mon Sep 17 00:00:00 2001
From: Michael Spencer <michael_spencer@apple.com>
Date: Tue, 1 Jul 2025 17:39:42 -0700
Subject: [PATCH] [ClangImporter] Fix dangling reference.

LookupOverloadedBinOp stores `Args` for later use, so store the
backing array on the stack instead of using a temporary.

This fixes a crash that appeared under some build configurations.

Related to rdar://154291418
---
 lib/ClangImporter/ClangDerivedConformances.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/ClangImporter/ClangDerivedConformances.cpp b/lib/ClangImporter/ClangDerivedConformances.cpp
index c54a3ecd1e995..4c9ef90402dfb 100644
--- a/lib/ClangImporter/ClangDerivedConformances.cpp
+++ b/lib/ClangImporter/ClangDerivedConformances.cpp
@@ -265,7 +265,8 @@ instantiateTemplatedOperator(ClangImporter::Implementation &impl,
       classDecl->getLocation(), clang::OverloadCandidateSet::CSK_Operator,
       clang::OverloadCandidateSet::OperatorRewriteInfo(opKind,
                                               clang::SourceLocation(), false));
-  clangSema.LookupOverloadedBinOp(candidateSet, opKind, ops, {arg, arg}, true);
+  std::array<clang::Expr *, 2> args{arg, arg};
+  clangSema.LookupOverloadedBinOp(candidateSet, opKind, ops, args, true);
 
   clang::OverloadCandidateSet::iterator best;
   switch (candidateSet.BestViableFunction(clangSema, clang::SourceLocation(),