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

[jakub at gcc dot gnu.org]

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

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
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.