[llvm-bugs] [Bug 39764] New: Coroutine optimization change returned value when using proxy type

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39764

            Bug ID: 39764
           Summary: Coroutine optimization change returned value when
                    using proxy type
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sidney.congard at gmail.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

I implemented a minimal promise type which returns a proxy converted to the
promise's member value when it's returned from the coroutine. This member value
is set by 'co_return' (by implementing 'return_value').

Some optimization seems to elide the local value, so the value set by calling
'co_return' is not returned :
https://wandbox.org/permlink/MdMuxwTjZdmM9xVi

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