[Bug sanitizer/63956] [5 Regression][UBSAN] ICE segfault in cxx_eval_call_expression ../../gcc/cp/constexpr.c

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63956

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
It looks like cxx_eval_call_expression just isn't prepared for internal
functions, with NULL_TREE CALL_EXPR_FN.