bug#30800: 26.0.91; unknown crash on macos

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Wed, 21 Mar 2018 09:25:57 -0700
> Cc: 30800@debbugs.gnu.org
> 
> On Tue, Mar 20, 2018 at 11:37 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> > Which part of FRAME_NS_VIEW causes the crash?  There are 2
> > dereferences there; which one is the culprit?
> 
> I believe it's the first:
> 
> (lldb) p represented_frame->output_data
> error: Couldn't apply expression side effects : Couldn't dematerialize
> a result variable: couldn't read its memory

Please also show the value of represented_frame itself.

Thanks.