On Thu, Feb 15, 2018 at 6:36 PM, Martin Sebor <mse...@gmail.com> wrote: > A failed template deduction in template member of a template > triggers an ICE with -std=c++17 due to what seems like > a missing handling of invalid input. Replacing > the gcc_unreachable() call that causes the ICE with a return > statement indicating the deduction failure eliminates the ICE > and restores sane diagnostics.
Hmm, we really shouldn't have gotten there; that assert is checking that when we see a TEMPLATE_*_PARM node in the template signature, it corresponds to one of the actual parms of the template. Sounds like something is going wrong in build_deduction_guide. Jason
