[C++ Patch] PR 80956 ("[7/8 Regression] ICE with abstract class vector")

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,

the main issue is already fixed in trunk but we still ICE on the reduced 
testcase attached by Jakub which has a broken std::initializer_list 
missing the definition. I think we can handle this case similarly to the 
existing check in do_pushtag, which would be also consistent with the 
plain error we give for, eg:

namespace std { template <class> class initializer_list; }

template class std::initializer_list<int>;

However, we still have the option of issuing a fatal_error, like we do 
in finish_struct.

In any case, I'm tweaking for consistency do_pushtag about %< and %>.

Tested x86_64-linux.

Thanks, Paolo.

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