tmp/tmp2bmdwki7/{from.md → to.md}
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#### Observers <a id="expected.un.obs">[[expected.un.obs]]</a>
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``` cpp
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constexpr const E& error() const & noexcept;
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constexpr E& error() & noexcept;
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```
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*Returns:* *unex*.
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``` cpp
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constexpr E&& error() && noexcept;
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constexpr const E&& error() const && noexcept;
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```
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*Returns:* `std::move(`*`unex`*`)`.
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