ahatanak added a comment.

Richard and Doug, do you have any thoughts on John's suggestion?

Comment at: test/CodeGenObjCXX/arc-list-init-destruct.mm:1
+// RUN: %clang_cc1 -triple x86_64-apple-macosx10.13.0 -std=c++1z -fobjc-arc 
-fobjc-exceptions -fcxx-exceptions -fexceptions -emit-llvm -o - %s | FileCheck 
rjmccall wrote:
> Does the corresponding C++ test case (replacing `Class0 *f;` with 
> `HasExplicitNonTrivialDestructor f;`) not reproduce the problem?
I wasn't able to reproduce the problem by changing the type of field 'f' to a 
C++ class with a non-trivial destructor because, if I make that change, 
Class1's destructor declaration gets added in 
Sema::AddImplicitlyDeclaredMembersToClass. I don't fully understand the reason 
behind it, but Class1's destructor declaration is added when the type of one of 
its subobject has a user-declared destructor.

  rC Clang


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