[Bug c++/84979] [6/7/8 Regression] ICE with auto as template parameter and -fconcepts

[aoliva at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84979

--- Comment #3 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
The patch has caused a number of tests in g++.dg/concepts to regress.
Looking into it.