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From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/94034] [10 Regression] Broken diagnostic: 'result_decl' not
 supported by dump_expr
Date: Thu, 09 Apr 2020 18:31:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94034

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu.org

--- Comment #6 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Patrick Palka from comment #5)
> Here is a rejects-valid testcase caused by the same underlying issue:

Actually, A does not have guaranteed copy elision in function argument pass=
ing
or return.  Which is a good thing, since it can't have it under the current
ABI.

http://eel.is/c++draft/class.temporary#3=20

"When an object of class type X is passed to or returned from a function, i=
f X
has at least one eligible copy or move constructor ([special]), each such
constructor is trivial, and the destructor of X is either trivial or delete=
d,
implementations are permitted to create a temporary object to hold the func=
tion
parameter or result object."

So I suppose my comment on Paolo's patch was wrong, and this is only a
diagnostic quality issue after all.=