[Bug c++/121601] New: ICE when exception is thrown from static_assert message expression

[hanicka at hanicka dot net via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121601

            Bug ID: 121601
           Summary: ICE when exception is thrown from static_assert
                    message expression
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hanicka at hanicka dot net
  Target Milestone: ---

Link to CE: https://godbolt.org/z/EK6GTs36h
git revision: 3b58b78f1a1fed8b273ee88f42bf5b5bc189d511

Following code crashes latest GCC at CE:

```c++
struct hana_string {
    constexpr const char * data() const noexcept;
    constexpr unsigned size() const noexcept;
};

consteval hana_string get_message() {
    throw 42;
}

static_assert(false, get_message());
```

Expected behaviour: an error message something like "get_message()" call is not
constant evaluatable due uncaught exception thrown out of it.