Rust 1.13.0 has been released. "The 1.13 release includes several extensions to the language, including the long-awaited ? operator, improvements to compile times, minor feature additions to cargo and the standard library. This release also includes many small enhancements to documentation and error reporting, by many contributors, that are not individually mentioned in the release notes. This release contains important security updates to Cargo, which depends on curl and OpenSSL, which both published security updates recently."

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