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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/95517] [coroutines] suggested warning when co_return and
 return_void() are missing
Date: Tue, 10 Aug 2021 05:32:38 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95517

--- Comment #5 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to mengjun wei from comment #4)
> GCC 11.2 no longer allow return_value and return_void be both defined, may
> this restriction be removed?=20

The restriction is part of the C++ standard (for the record, there was
discussion about allowing both to be present, but that was rejected by the
committee).

https://eel.is/c++draft/dcl.fct.def.coroutine#6

So, we cannot remove the restriction.=