[Bug c++/93689] ICE with default argument in lambda used as non type template argument

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93689

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
That's hard to say without really understanding what the issue is, but I'm
afraid this might not be the best first issue -- it involves some pretty
convoluted features, plus it seems there are two issues (that
maybe_constant_value gets a template code and the gimplifier ICE).  "Luckily"
we have over 3000 C++ issues and some of them should be more straightforward:

https://gcc.gnu.org/bugzilla/buglist.cgi?component=c%2B%2B&limit=0&list_id=240106&product=gcc&query_format=advanced&resolution=---&order=bug_id%20DESC&query_based_on=

Note that we're in stage 4 now, meaning that we only fix regressions.  Good
luck.