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From: "noah at vectorized dot io" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/101367] New: [coroutines] destructor for capture in lambda
 temporary operand to co_yield expression called twice
Date: Wed, 07 Jul 2021 16:16:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101367

            Bug ID: 101367
           Summary: [coroutines] destructor for capture in lambda
                    temporary operand to co_yield expression called twice
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: noah at vectorized dot io
  Target Milestone: ---

I'm observing an issue in which it appears that the destructor for a captur=
ed
object in a lambda which is passed as a temporary to a co_await/co_yield
expression is being called twice.

Here is a reproducer https://godbolt.org/z/8jrGx7qsT which is a slight
modification of the reproducer used in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95599 that was related to the
order of destructors in co_await/co_yield expressions.

In the reproducer I gave when the lambda temporary doesn't capture a
std::string value things work, but when it does you can see that gcc reports
`free(): invalid pointer`.

It also appears that https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100611 =
may be
closely related.=