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-rw-r--r--clang/lib/AST/ExprConstant.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index 567002cf828..06c41a2e7ea 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -2881,6 +2881,9 @@ bool LValueExprEvaluator::VisitCXXTypeidExpr(const CXXTypeidExpr *E) {
if (E->isTypeOperand())
return Success(E);
CXXRecordDecl *RD = E->getExprOperand()->getType()->getAsCXXRecordDecl();
+ // FIXME: The standard says "a typeid expression whose operand is of a
+ // polymorphic class type" is not a constant expression, but it probably
+ // means "a typeid expression whose operand is potentially evaluated".
if (RD && RD->isPolymorphic()) {
Info.Diag(E, diag::note_constexpr_typeid_polymorphic)
<< E->getExprOperand()->getType()
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