This overload of `template <class PARAM_1, class PARAM_2> operator std::tuple<PARAM_1&, PARAM_2&>()` is called when the (template parameter) PARAM_1 (first element's type) is the type of std::ignore.
Synopsis
Declared in <bslstl_pair.h>
template<
class PARAM_2,
class = void>
requires bsl::is_convertible<T2, PARAM_2>::value
operator std::tuple<decltype(std::ignore)&, PARAM_2&>() noexcept;
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