tmp/tmp0lr_cug1/{from.md → to.md}
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#### Equality operators <a id="expected.void.eq">[[expected.void.eq]]</a>
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``` cpp
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template<class T2, class E2> requires is_void_v<T2>
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friend constexpr bool operator==(const expected& x, const expected<T2, E2>& y);
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```
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*Mandates:* The expression `x.error() == y.error()` is well-formed and
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its result is convertible to `bool`.
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*Returns:* If `x.has_value()` does not equal `y.has_value()`, `false`;
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otherwise `x.has_value() || static_cast<bool>(x.error() == y.error())`.
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``` cpp
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template<class E2>
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friend constexpr bool operator==(const expected& x, const unexpected<E2>& e);
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```
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*Mandates:* The expression `x.error() == e.error()` is well-formed and
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its result is convertible to `bool`.
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*Returns:*
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`!x.has_value() && static_cast<bool>(x.error() == e.error())`.
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