[Bug ipa/83549] [7/8 Regression] error: generic thunk code fails for method ... which uses '...'

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83549

--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #3)
> With current trunk:
> 
> $ ./cc1plus -quiet pr83549.C
> $ ./cc1plus -quiet pr83549.C -O1
> pr83549.C:4:4: error: generic thunk code fails for method ‘virtual void
> C::_ZThn8_N1C3fooEz(...)’ which uses ‘...’
>  C c;
>     ^
> 
> (likewise for -O2, -O3) on x86_64-linux.

I see. I've got patch for that. My question is how did you isolate the
testcase?