From 599027857e1007ff402094a3a550b4832f3f5146 Mon Sep 17 00:00:00 2001
From: Haojian Wu <hokein.wu@gmail.com>
Date: Thu, 28 Mar 2024 18:58:52 +0100
Subject: [PATCH] [clang] Add invalid check in
 NormalizedConstraint::fromConstraintExpr. (#86943)

This is an oversight spot in #86869, we should always check the invalid
bit after constructing the `Sema::InstantiatingTemplate` RAII object.
---
 clang/lib/Sema/SemaConcept.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/clang/lib/Sema/SemaConcept.cpp b/clang/lib/Sema/SemaConcept.cpp
index a2d8ba9a96d7a4..b2986c5012ea2b 100644
--- a/clang/lib/Sema/SemaConcept.cpp
+++ b/clang/lib/Sema/SemaConcept.cpp
@@ -1356,6 +1356,8 @@ NormalizedConstraint::fromConstraintExpr(Sema &S, NamedDecl *D, const Expr *E) {
           S, CSE->getExprLoc(),
           Sema::InstantiatingTemplate::ConstraintNormalization{}, D,
           CSE->getSourceRange());
+      if (Inst.isInvalid())
+        return std::nullopt;
       // C++ [temp.constr.normal]p1.1
       // [...]
       // The normal form of an id-expression of the form C<A1, A2, ..., AN>,