From ae6f7bcb367465ba1b97cdcb27d528b49f7b238d Mon Sep 17 00:00:00 2001
From: Richard Smith <richard-llvm@metafoo.co.uk>
Date: Tue, 10 Sep 2019 00:39:53 +0000
Subject: Fix crash mangling an explicit lambda non-type template parameter
 pack that is not a pack expansion.

llvm-svn: 371476
---
 clang/lib/AST/ItaniumMangle.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'clang/lib/AST/ItaniumMangle.cpp')

diff --git a/clang/lib/AST/ItaniumMangle.cpp b/clang/lib/AST/ItaniumMangle.cpp
index 2a2b491bcbd..66bccbe4584 100644
--- a/clang/lib/AST/ItaniumMangle.cpp
+++ b/clang/lib/AST/ItaniumMangle.cpp
@@ -1704,7 +1704,8 @@ void CXXNameMangler::mangleTemplateParamDecl(const NamedDecl *Decl) {
       QualType T = Tn->getType();
       if (Tn->isParameterPack()) {
         Out << "Tp";
-        T = T->castAs<PackExpansionType>()->getPattern();
+        if (auto *PackExpansion = T->getAs<PackExpansionType>())
+          T = PackExpansion->getPattern();
       }
       Out << "Tn";
       mangleType(T);
-- 
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