[c++2a] Fix assertion failure if we would walk over more than one level

of derived-to-base conversion path when implicitly starting union
subobject lifetimes in constant evaluation.

llvm-svn: 362147

1 files changed, 10 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/constant-expression-cxx2a.cpp b/clang/test/SemaCXX/constant-expression-cxx2a.cpp
index aa534ce592e..f29f4beb290 100644
--- a/clang/test/SemaCXX/constant-expression-cxx2a.cpp
+++ b/clang/test/SemaCXX/constant-expression-cxx2a.cpp
@@ -521,4 +521,14 @@ namespace Union {
     u1 = u2;
     return true;
   }();
+
+  struct S1 {
+    int n;
+  };
+  struct S2 : S1 {};
+  struct S3 : S2 {};
+  void f() {
+    S3 s;
+    s.n = 0;
+  }
 }