[Bug c++/96155] New: "throw" that is not executed in constexpr function fails to compile

[r-gcc at mail dot uk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96155

            Bug ID: 96155
           Summary: "throw" that is not executed in constexpr function
                    fails to compile
           Product: gcc
           Version: 10.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: r-gcc at mail dot uk
  Target Milestone: ---

This fails to compile on gcc trunk, while the same code compiles fine in clang:

constexpr bool foo()
{
    for(int i = 0; i != 5; ++i)
    {
        if(i == 3)
            return false;
    }
    throw 5;
    return true;
}


this is the message I am getting:

error: expression ‘<throw-expression>’ is not a constant expression

live example:

https://godbolt.org/z/eqqr4f