[Bug c++/96241] New: ICE in verify_ctor_sanity

[cbcode at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96241

            Bug ID: 96241
           Summary: ICE in verify_ctor_sanity
           Product: gcc
           Version: 10.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: cbcode at gmail dot com
  Target Milestone: ---

The following generates
internal compiler error: in verify_ctor_sanity, at cp/constexpr.c:3869
for gcc-10.1.0 (x86_64 and i686, Linux), gcc-9.x also ICEs.
gcc-8.x and gcc-7.x are fine, so are clang and intel-compiler.


enum struct enu : int {
    o = 0,
    p = 1,
};
constexpr enu& operator|=(enu& a, enu b) {
    return a = enu(static_cast<int>(a) + static_cast<int>(b));
}
struct s {
    enu e = enu::o;
};
template<typename T, int N> struct my_array {
    T data[N];
};
static constexpr auto make_ss = []{
    my_array<s, 1> ss = {};
    //ss.data[0] = {}; //work-around to avoid ICE on next line
    ss.data[0].e |= enu::p; //ICE
    return ss;
}();