https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115905

--- Comment #14 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Iain Sandoe from comment #13)
> looking like a GTY issue:
> 
> (gdb) p target->u.fld[1]->rt_mem
> $7 = (mem_attrs *) 0xafafafaf
> (gdb) p target->u.fld[1]->rt_mem->align
> 
> that seems to be the tell-tale value for a free ptr.

The report issue is not related to the fix for this PR - or any recent
coroutine change, I've backed out back to f4915e6c4cd and the ICE remains.

NOTE: the test case should still compile with earlier GCC versions, it will not
execute correctly - but the ICE is at compile-time.  Please, if you are able,
could you see if earlier GCC versions ICE in the same way.

I guess we need a new PR and some attempt to locate the cause...

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