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###
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### [[library]]: library introduction <a id="diff.cpp14.library">[[diff.cpp14.library]]</a>
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**Change:** New headers. **Rationale:** New functionality. **Effect on
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original feature:** The following C++ headers are new: `<any>`,
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`<charconv>`, `<execution>`, `<filesystem>`, `<memory_resource>`,
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`<optional>`,
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`<string_view>`, and `<variant>`. Valid C++14 code that `#include`s
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headers with these names may be invalid in this International Standard.
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**Change:** New reserved namespaces. **Rationale:** Reserve namespaces
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for future revisions of the standard library that might otherwise be
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incompatible with existing programs. **Effect on original feature:** The
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global namespaces `std` followed by an arbitrary sequence of *digit*s
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[[lex.name]] are reserved for future standardization. Valid C++14 code
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that uses such a top-level namespace, e.g., `std2`, may be invalid in
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this International Standard.
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