[Bug c++/80891] [8 Regression] Three new ICEs

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80891

--- Comment #6 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Case #1 fixed r248573.

Leaving defect open to address concern described in
https://gcc.gnu.org/ml/gcc-patches/2017-05/msg02189.html