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-rw-r--r--clang/lib/AST/ExprConstant.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index ac21b63cc79..df9b3067b8d 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -5031,7 +5031,8 @@ static bool HandleUnionActiveMemberChange(EvalInfo &Info, const Expr *LHSExpr,
if (ICE->getCastKind() != CK_DerivedToBase &&
ICE->getCastKind() != CK_UncheckedDerivedToBase)
break;
- for (const CXXBaseSpecifier *Elt : ICE->path()) {
+ // Walk path backwards as we walk up from the base to the derived class.
+ for (const CXXBaseSpecifier *Elt : llvm::reverse(ICE->path())) {
--PathLength;
(void)Elt;
assert(declaresSameEntity(Elt->getType()->getAsCXXRecordDecl(),
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