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Created August 13, 2016 04:18
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Rust Releases Note.md

Version 1.10.0 (2016-07-07)

Language

Stabilized APIs

Libraries

Cargo

Performance

Usability

Misc

Compatibility Notes

Version 1.9.0 (2016-05-26)

Language

Stabilized APIs

Libraries

Cargo

Performance

Misc

Compatibility Notes

Version 1.8.0 (2016-04-14)

Language

Libraries

Performance

Misc

Cargo

Compatibility Notes

Version 1.7.0 (2016-03-03)

Libraries

Misc

Cargo

Compatibility Notes

Version 1.6.0 (2016-01-21)

Language

  • The #![no_std] attribute causes a crate to not be linked to the standard library, but only the core library, as described in RFC 1184. The core library defines common types and traits but has no platform dependencies whatsoever, and is the basis for Rust software in environments that cannot support a full port of the standard library, such as operating systems. Most of the core library is now stable.

Libraries

Cargo

  • Cargo will look in $CARGO_HOME/bin for subcommands by default.
  • Cargo build scripts can specify their dependencies by emitting the rerun-if-changed key.
  • crates.io will reject publication of crates with dependencies that have a wildcard version constraint. Crates with wildcard dependencies were seen to cause a variety of problems, as described in RFC 1241. Since 1.5 publication of such crates has emitted a warning.
  • cargo clean accepts a --release flag to clean the release folder. A variety of artifacts that Cargo failed to clean are now correctly deleted.

Misc

Compatibility Notes

Version 1.5.0 (2015-12-10)

  • ~700 changes, numerous bugfixes

Highlights

Breaking Changes

Language

  • When evaluating expressions at compile-time that are not compile-time constants (const-evaluating expressions in non-const contexts), incorrect code such as overlong bitshifts and arithmetic overflow will generate a warning instead of an error, delaying the error until runtime. This will allow the const-evaluator to be expanded in the future backwards-compatibly.
  • The improper_ctypes lint no longer warns about using isize and usize in FFI.

Libraries

Miscellaneous

Version 1.4.0 (2015-10-29)

  • ~1200 changes, numerous bugfixes

Highlights

  • Windows builds targeting the 64-bit MSVC ABI and linker (instead of GNU) are now supported and recommended for use.

Breaking Changes

Language

Libraries

Miscellaneous

Version 1.3.0 (2015-09-17)

  • ~900 changes, numerous bugfixes

Highlights

  • The new object lifetime defaults have been turned on after a cycle of warnings about the change. Now types like &'a Box<Trait> (or &'a Rc<Trait>, etc) will change from being interpreted as &'a Box<Trait+'a> to &'a Box<Trait+'static>.
  • The Rustonomicon is a new book in the official documentation that dives into writing unsafe Rust.
  • The Duration API, has been stabilized. This basic unit of timekeeping is employed by other std APIs, as well as out-of-tree time crates.

Breaking Changes

Language

Libraries

Misc

Version 1.2.0 (2015-08-07)

  • ~1200 changes, numerous bugfixes

Highlights

Breaking Changes

Language

  • Patterns with ref mut now correctly invoke DerefMut when matching against dereferencable values.

Libraries

  • The Extend trait, which grows a collection from an iterator, is implemented over iterators of references, for String, Vec, LinkedList, VecDeque, EnumSet, BinaryHeap, VecMap, BTreeSet and BTreeMap. RFC.
  • The iter::once function returns an iterator that yields a single element, and iter::empty returns an iterator that yields no elements.
  • The matches and rmatches methods on str return iterators over substring matches.
  • Cell and RefCell both implement Eq.
  • A number of methods for wrapping arithmetic are added to the integral types, wrapping_div, wrapping_rem, wrapping_neg, wrapping_shl, wrapping_shr. These are in addition to the existing wrapping_add, wrapping_sub, and wrapping_mul methods, and alternatives to the Wrapping type.. It is illegal for the default arithmetic operations in Rust to overflow; the desire to wrap must be explicit.
  • The {:#?} formatting specifier displays the alternate, pretty-printed form of the Debug formatter. This feature was actually introduced prior to 1.0 with little fanfare.
  • fmt::Formatter implements fmt::Write, a fmt-specific trait for writing data to formatted strings, similar to io::Write.
  • fmt::Formatter adds 'debug builder' methods, debug_struct, debug_tuple, debug_list, debug_set, debug_map. These are used by code generators to emit implementations of Debug.
  • str has new to_uppercase and to_lowercase methods that convert case, following Unicode case mapping.
  • It is now easier to handle poisoned locks. The PoisonError type, returned by failing lock operations, exposes into_inner, get_ref, and get_mut, which all give access to the inner lock guard, and allow the poisoned lock to continue to operate. The is_poisoned method of RwLock and Mutex can poll for a poisoned lock without attempting to take the lock.
  • On Unix the FromRawFd trait is implemented for Stdio, and AsRawFd for ChildStdin, ChildStdout, ChildStderr. On Windows the FromRawHandle trait is implemented for Stdio, and AsRawHandle for ChildStdin, ChildStdout, ChildStderr.
  • io::ErrorKind has a new variant, InvalidData, which indicates malformed input.

Misc

Version 1.1.0 (2015-06-25)

  • ~850 changes, numerous bugfixes

Highlights

  • The std::fs module has been expanded to expand the set of functionality exposed:
    • DirEntry now supports optimizations like file_type and metadata which don't incur a syscall on some platforms.
    • A symlink_metadata function has been added.
    • The fs::Metadata structure now lowers to its OS counterpart, providing access to all underlying information.
  • The compiler now contains extended explanations of many errors. When an error with an explanation occurs the compiler suggests using the --explain flag to read the explanation. Error explanations are also available online.
  • Thanks to multiple improvements to type checking, as well as other work, the time to bootstrap the compiler decreased by 32%.

Libraries

Misc

Version 1.0.0 (2015-05-15)

  • ~1500 changes, numerous bugfixes

Highlights

  • The vast majority of the standard library is now #[stable]. It is no longer possible to use unstable features with a stable build of the compiler.
  • Many popular crates on crates.io now work on the stable release channel.
  • Arithmetic on basic integer types now checks for overflow in debug builds.

Language

Libraries

Misc

  • Many errors now have extended explanations that can be accessed with the --explain flag to rustc.
  • Many new examples have been added to the standard library documentation.
  • rustdoc has received a number of improvements focused on completion and polish.
  • Metadata was tuned, shrinking binaries by 27%.
  • Much headway was made on ecosystem-wide CI, making it possible to compare builds for breakage.

Version 1.0.0-alpha.2 (2015-02-20)

  • ~1300 changes, numerous bugfixes

  • Highlights

    • The various I/O modules were overhauled to reduce unnecessary abstractions and provide better interoperation with the underlying platform. The old io module remains temporarily at std::old_io.
    • The standard library now participates in feature gating, so use of unstable libraries now requires a #![feature(...)] attribute. The impact of this change is described on the forum. RFC.

  • Language

    • for loops now operate on the IntoIterator trait, which eliminates the need to call .iter(), etc. to iterate over collections. There are some new subtleties to remember though regarding what sort of iterators various types yield, in particular that for foo in bar { } yields values from a move iterator, destroying the original collection. RFC.
    • Objects now have default lifetime bounds, so you don't have to write Box<Trait+'static> when you don't care about storing references. RFC.
    • In types that implement Drop, lifetimes must outlive the value. This will soon make it possible to safely implement Drop for types where #[unsafe_destructor] is now required. Read the gorgeous RFC for details.
    • The fully qualified ::X syntax lets you set the Self type for a trait method or associated type. RFC.
    • References to types that implement Deref<U> now automatically coerce to references to the dereferenced type U, e.g. &T where T: Deref<U> automatically coerces to &U. This should eliminate many unsightly uses of &*, as when converting from references to vectors into references to slices. RFC.
    • The explicit closure kind syntax (|&:|, |&mut:|, |:|) is obsolete and closure kind is inferred from context.
    • Self is a keyword.

  • Libraries

    • The Show and String formatting traits have been renamed to Debug and Display to more clearly reflect their related purposes. Automatically getting a string conversion to use with format!("{:?}", something_to_debug) is now written #[derive(Debug)].
    • Abstract OS-specific string types, std::ff::{OsString, OsStr}, provide strings in platform-specific encodings for easier interop with system APIs. RFC.
    • The boxed::into_raw and Box::from_raw functions convert between Box<T> and *mut T, a common pattern for creating raw pointers.

  • Tooling

  • Misc

    • Rust is tested against a LALR grammar, which parses almost all the Rust files that rustc does.

Version 1.0.0-alpha (2015-01-09)

  • ~2400 changes, numerous bugfixes

  • Highlights

    • The language itself is considered feature complete for 1.0, though there will be many usability improvements and bugfixes before the final release.
    • Nearly 50% of the public API surface of the standard library has been declared 'stable'. Those interfaces are unlikely to change before 1.0.
    • The long-running debate over integer types has been [settled][ints]: Rust will ship with types named isize and usize, rather than int and uint, for pointer-sized integers. Guidelines will be rolled out during the alpha cycle.
    • Most crates that are not std have been moved out of the Rust distribution into the Cargo ecosystem so they can evolve separately and don't need to be stabilized as quickly, including 'time', 'getopts', 'num', 'regex', and 'term'.
    • Documentation continues to be expanded with more API coverage, more examples, and more in-depth explanations. The guides have been consolidated into [The Rust Programming Language][trpl].
    • "[Rust By Example][rbe]" is now maintained by the Rust team.
    • All official Rust binary installers now come with [Cargo], the Rust package manager.

  • Language

    • Closures have been [completely redesigned][unboxed] to be implemented in terms of traits, can now be used as generic type bounds and thus monomorphized and inlined, or via an opaque pointer (boxed) as in the old system. The new system is often referred to as 'unboxed' closures.
    • Traits now support [associated types][assoc], allowing families of related types to be defined toget
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