Multiple ChoiceIntermediate 45s
optional value access errors
What happens if you call `*opt` or `opt.value()` on a disengaged `std::optional`?
Options
- 1`*opt` is UB; `value()` throws std::bad_optional_access (or aborts without exceptions).
- 2Both operations return a default-constructed T instead of failing.
- 3Both operations throw std::runtime_error, since optional has no value to hand back.
- 4`*opt` returns std::nullopt in a disengaged state; `value()` is UB in that same state.
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