Re: [PATCH 1/1] gdb: set the cache information in 'get_prev_frame_maybe_check_cycle'

Andrew> Comparing to null_frame_id always returns false, see
Andrew> frame_id::operator== for details.

I wonder if this could be changed.

This comparison behavior seems difficult to use, to me, whereas
comparing against "null" seems more normal... in ordinary code it's
really only NaNs that have this weird property and I tend to think
that's a bad model.

Tom