[Bug c++/126754] [16/17 Regression] ICE in tsubst_expr, at cp/pt.cc:23354 since r16-5970

[ppalka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126754

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |ppalka at gcc dot gnu.org

--- Comment #4 from Patrick Palka <ppalka at gcc dot gnu.org> ---
For the 16 branch maybe we could just guard the gcc_unreachable with
flag_checking so that r16-5970 is purely a documentation change.