[Bug c++/94661] coroutine ramp function return value ICE for default copy CTOR.

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94661

--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Iain D Sandoe <iains@gcc.gnu.org>:

https://gcc.gnu.org/g:cd08718d57d1552fa2dbca96809e4915559685e7

commit r10-7842-gcd08718d57d1552fa2dbca96809e4915559685e7
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Tue Apr 21 10:35:13 2020 +0100

    coroutines: Fix handling of ramp return value [PR94661]

    Coroutine ramp functions have synthesised return values (the
    user-authored function body cannot have an explicit 'return').
    The current implementation attempts to optimise by building
    the return in-place, in the manner of C++17 code. Clearly,
    that was too ambitious and the fix builds a target expr for
    the constructed version and passes that to finish_return_stmt.

    This also means that we now get the same error messages for
    implicit use of deleted CTORs etc.

    gcc/cp/ChangeLog:

    2020-04-21 Iain Sandoe <iain@sandoe.co.uk>

            PR c++/94661
            * coroutines.cc (morph_fn_to_coro): Simplify return
            value computation.

    gcc/testsuite/ChangeLog:

            2020-04-21 Iain Sandoe <iain@sandoe.co.uk>

            PR c++/94661
            * g++.dg/coroutines/ramp-return-a.C: New test.
            * g++.dg/coroutines/ramp-return-b.C: New test.
            * g++.dg/coroutines/ramp-return-c.C: New test.