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Rust 1.56.0 Release Notes

// RUST-RELEASE-NOTES — official release note timeline

Rust 1.56.0 공식 release note를 기준으로, 섹션별 앞쪽 항목을 발췌해 변화 흐름을 빠르게 훑을 수 있게 정리했습니다.

범위​

  • 대상 릴리즈: Rust 1.56.0
  • 포함된 릴리즈 수: 1개
  • 생성 경로: scripts/bloggen.py rust-release-docs
  • 생성일: 2026-07-08
  • 원문: rust-lang/rust RELEASES.md

읽는 법​

  • 이 문서는 해당 Rust 릴리즈 하나만 다룹니다.
  • 섹션별 최대 3개 앞쪽 항목만 발췌했으므로, 세부 API 목록은 원문 링크를 확인하세요.
  • Compatibility Notes는 업그레이드 전 회귀 위험을 확인하는 체크리스트로 보면 됩니다.

타임라인​

Rust 1.56.0 (2021-10-21)​

  • Language
    • The 2021 Edition is now stable. See the edition guide for more details.
    • The pattern in binding @ pattern can now also introduce new bindings.
    • Union field access is permitted in const fn.
  • Compiler
    • Upgrade to LLVM 13.
    • Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.
    • Allow specifying a deployment target version for all iOS targets
    • 그 외 4개 항목은 원문 참고
  • Libraries
    • Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows. The Windows console still requires valid Unicode, but this change allows splitting a UTF-8 character across multiple write calls. This allows, for instance, programs that just read and write data buffers (e.g. copying a file to stdout) without regard for Unicode or character boundarie…
    • Prefer AtomicU{64,128} over Mutex for Instant backsliding protection. For this use case, atomics scale much better under contention.
    • Implement Extend<(A, B)> for (Extend<A>, Extend<B>)
    • 그 외 4개 항목은 원문 참고
  • Stabilized APIs
    • std::os::unix::fs::chroot
    • UnsafeCell::raw_get
    • BufWriter::into_parts
    • 그 외 14개 항목은 원문 참고
  • Cargo
    • Cargo supports specifying a minimum supported Rust version in Cargo.toml. This has no effect at present on dependency version selection. We encourage crates to specify their minimum supported Rust version, and we encourage CI systems that support Rust code to include a crate's specified minimum version in the test matrix for that crate by default.
  • Compatibility Notes
    • Update to new argument parsing rules on Windows. This adjusts Rust's standard library to match the behavior of the standard libraries for C/C++. The rules have changed slightly over time, and this PR brings us to the latest set of rules (changed in 2008).
    • Disallow the aapcs calling convention on aarch64 This was already not supported by LLVM; this change surfaces this lack of support with a better error message.
    • Make SEMICOLON_IN_EXPRESSIONS_FROM_MACROS warn by default
    • 그 외 2개 항목은 원문 참고

Sources​