[PATCH 15/16] gdb: make cmd_list_element var an optional union

[Tom Tromey]

>>>>> "Simon" == Simon Marchi <simon.marchi@polymtl.ca> writes:

>> There are other implementations of this method that don't check, though,
>> and I don't understand why.

Simon> Indeed, I filed this with gcc and was (rightfully) corrected:

Simon>   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101659

Simon> What other implementations are you referring to?

struct _Optional_payload_base has:

      constexpr _Tp&
      _M_get() noexcept
      { return this->_M_payload._M_value; }

I don't know why this one doesn't check, but I suppose given the
resolution of that bug, it's probably fine.

Tom