[Bug c++/89913] [8/9/10 Regression] [concepts] ICE with invalid using declaration

[andrew.n.sutton at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89913

Andrew Sutton <andrew.n.sutton at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |andrew.n.sutton at gmail dot com

--- Comment #3 from Andrew Sutton <andrew.n.sutton at gmail dot com> ---
This isn't strictly related to concepts.

Resolution posted here:

https://gcc.gnu.org/ml/gcc-patches/2019-11/msg01429.html

The tests target C++20, but this could be extended back to C++11. However, the
diagnostic is different for pre-C++20.