Version 1.3.0 (September 2015) ============================== * ~900 changes, numerous bugfixes Highlights ---------- * The [new object lifetime defaults][nold] have been [turned on][nold2] after a cycle of warnings about the change. Now types like `&'a Box` (or `&'a Rc`, etc) will change from being interpreted as `&'a Box` to `&'a Box`. * [The Rustonomicon][nom] is a new book in the official documentation that dives into writing unsafe Rust. * The [`Duration`] API, [has been stabilized][ds]. This basic unit of timekeeping is employed by other std APIs, as well as out-of-tree time crates. Breaking Changes ---------------- * The [new object lifetime defaults][nold] have been [turned on][nold2] after a cycle of warnings about the change. * There is a known [regression][lr] in how object lifetime elision is interpreted, the proper solution for which is undetermined. * The `#[prelude_import]` attribute, an internal implementation detail, was accidentally stabilized previously. [It has been put behind the `prelude_import` feature gate][pi]. This change is believed to break no existing code. * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is [more sane for dynamically sized types][dst3]. Code that relied on the previous behavior is thought to be broken. * The `dropck` rules, which checks that destructors can't access destroyed values, [have been updated][dropck] to match the [RFC][dropckrfc]. This fixes some soundness holes, and as such will cause some previously-compiling code to no longer build. Language -------- * The [new object lifetime defaults][nold] have been [turned on][nold2] after a cycle of warnings about the change. * Semicolons may [now follow types and paths in macros](https://github.com/rust-lang/rust/pull/27000). * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is [more sane for dynamically sized types][dst3]. Code that relied on the previous behavior is not known to exist, and suspected to be broken. * `'static` variables [may now be recursive][st]. * `ref` bindings choose between [`Deref`] and [`DerefMut`] implementations correctly. * The `dropck` rules, which checks that destructors can't access destroyed values, [have been updated][dropck] to match the [RFC][dropckrfc]. Libraries --------- * The [`Duration`] API, [has been stabilized][ds], as well as the `std::time` module, which presently contains only `Duration`. * `Box` and `Box<[T]>` both implement `Clone`. * The owned C string, [`CString`], implements [`Borrow`] and the borrowed C string, [`CStr`], implements [`ToOwned`]. The two of these allow C strings to be borrowed and cloned in generic code. * [`CStr`] implements [`Debug`]. * [`AtomicPtr`] implements [`Debug`]. * [`Error`] trait objects [can be downcast to their concrete types][e] in many common configurations, using the [`is`], [`downcast`], [`downcast_ref`] and [`downcast_mut`] methods, similarly to the [`Any`] trait. * Searching for substrings now [employs the two-way algorithm][search] instead of doing a naive search. This gives major speedups to a number of methods, including [`contains`][sc], [`find`][sf], [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and [`ends_with`][sew] are also faster. * The performance of `PartialEq` for slices is [much faster][ps]. * The [`Hash`] trait offers the default method, [`hash_slice`], which is overridden and optimized by the implementations for scalars. * The [`Hasher`] trait now has a number of specialized `write_*` methods for primitive types, for efficiency. * The I/O-specific error type, [`std::io::Error`][ie], gained a set of methods for accessing the 'inner error', if any: [`get_ref`][iegr], [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation of [`std::error::Error::cause`][iec] also delegates to the inner error. * [`process::Child`][pc] gained the [`id`] method, which returns a `u32` representing the platform-specific process identifier. * The [`connect`] method on slices is deprecated, replaced by the new [`join`] method (note that both of these are on the *unstable* [`SliceConcatExt`] trait, but through the magic of the prelude are available to stable code anyway). * The [`Div`] operator is implemented for [`Wrapping`] types. * [`DerefMut` is implemented for `String`][dms]. * Performance of SipHash (the default hasher for `HashMap`) is [better for long data][sh]. * [`AtomicPtr`] implements [`Send`]. * The [`read_to_end`] implementations for [`Stdin`] and [`File`] are now [specialized to use uninitalized buffers for increased performance][rte]. * Lifetime parameters of foreign functions [are now resolved properly][f]. Misc ---- * Rust can now, with some coercion, [produce programs that run on Windows XP][xp], though XP is not considered a supported platform. * Porting Rust on Windows from the GNU toolchain to MSVC continues ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not recommended for use in 1.3, though should be fully-functional in the [64-bit 1.4 beta][b14]. * On Fedora-based systems installation will [properly configure the dynamic linker][fl]. * The compiler gained many new extended error descriptions, which can be accessed with the `--explain` flag. * The `dropck` pass, which checks that destructors can't access destroyed values, [has been rewritten][dropck]. This fixes some soundness holes, and as such will cause some previously-compiling code to no longer build. * `rustc` now uses [LLVM to write archive files where possible][ar]. Eventually this will eliminate the compiler's dependency on the ar utility. * Rust has [preliminary support for i686 FreeBSD][fb] (it has long supported FreeBSD on x86_64). * The [`unused_mut`][lum], [`unconditional_recursion`][lur], [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are more strict. * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!` will kill the process instead of leaking][nlp]. [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end [ar]: https://github.com/rust-lang/rust/pull/26926 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi [dms]: https://github.com/rust-lang/rust/pull/26241 [dropck]: https://github.com/rust-lang/rust/pull/27261 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md [ds]: https://github.com/rust-lang/rust/pull/26818 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html [dst3]: https://github.com/rust-lang/rust/pull/27351 [e]: https://github.com/rust-lang/rust/pull/24793 [f]: https://github.com/rust-lang/rust/pull/26588 [fb]: https://github.com/rust-lang/rust/pull/26959 [fl]: https://github.com/rust-lang/rust-installer/pull/41 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner [lic]: https://github.com/rust-lang/rust/pull/26583 [lnu]: https://github.com/rust-lang/rust/pull/27026 [lr]: https://github.com/rust-lang/rust/issues/27248 [lum]: https://github.com/rust-lang/rust/pull/26378 [lur]: https://github.com/rust-lang/rust/pull/26783 [nlp]: https://github.com/rust-lang/rust/pull/27176 [nold2]: https://github.com/rust-lang/rust/pull/27045 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md [nom]: http://doc.rust-lang.org/nightly/nomicon/ [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html [pi]: https://github.com/rust-lang/rust/pull/26699 [ps]: https://github.com/rust-lang/rust/pull/26884 [rte]: https://github.com/rust-lang/rust/pull/26950 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains [search]: https://github.com/rust-lang/rust/pull/26327 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find [sh]: https://github.com/rust-lang/rust/pull/27280 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with [st]: https://github.com/rust-lang/rust/pull/26630 [win1]: https://github.com/rust-lang/rust/pull/26569 [win2]: https://github.com/rust-lang/rust/pull/26741 [win3]: https://github.com/rust-lang/rust/pull/26741 [win4]: https://github.com/rust-lang/rust/pull/27210 [xp]: https://github.com/rust-lang/rust/pull/26569 Version 1.2.0 (2015-08-07) ========================== * ~1200 changes, numerous bugfixes Highlights ---------- * [Dynamically-sized-type coercions][dst] allow smart pointer types like `Rc` to contain types without a fixed size, arrays and trait objects, finally enabling use of `Rc<[T]>` and completing the implementation of DST. * [Parallel codegen][parcodegen] is now working again, which can substantially speed up large builds in debug mode; It also gets another ~33% speedup when bootstrapping on a 4 core machine (using 8 jobs). It's not enabled by default, but will be "in the near future". It can be activated with the `-C codegen-units=N` flag to `rustc`. * This is the first release with [experimental support for linking with the MSVC linker and lib C on Windows (instead of using the GNU variants via MinGW)][win]. It is yet recommended only for the most intrepid Rusticians. * Benchmark compilations are showing a 30% improvement in bootstrapping over 1.1. Breaking Changes ---------------- * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do unicode case mapping, which is a previously-planned change in behavior and considered a bugfix. * [`mem::align_of`] now specifies [the *minimum alignment* for T][align], which is usually the alignment programs are interested in, and the same value reported by clang's `alignof`. [`mem::min_align_of`] is deprecated. This is not known to break real code. * [The `#[packed]` attribute is no longer silently accepted by the compiler][packed]. This attribute did nothing and code that mentioned it likely did not work as intended. * Associated type defaults are [now behind the `associated_type_defaults` feature gate][ad]. In 1.1 associated type defaults *did not work*, but could be mentioned syntactically. As such this breakage has minimal impact. 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][extend-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][debugfmt] 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`][strup] and [`to_lowercase`][strlow] 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 ---- * `rustc` employs smarter heuristics for guessing at [typos]. * `rustc` emits more efficient code for [no-op conversions between unsafe pointers][nop]. * Fat pointers are now [passed in pairs of immediate arguments][fat], resulting in faster compile times and smaller code. [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/ [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html [align]: https://github.com/rust-lang/rust/pull/25646 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html [typos]: https://github.com/rust-lang/rust/pull/26087 [nop]: https://github.com/rust-lang/rust/pull/26336 [fat]: https://github.com/rust-lang/rust/pull/26411 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md [parcodegen]: https://github.com/rust-lang/rust/pull/26018 [packed]: https://github.com/rust-lang/rust/pull/25541 [ad]: https://github.com/rust-lang/rust/pull/27382 [win]: https://github.com/rust-lang/rust/pull/25350 Version 1.1.0 (2015-06-25) ========================= * ~850 changes, numerous bugfixes Highlights ---------- * The [`std::fs` module has been expanded][fs] 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][err-index]. * Thanks to multiple [improvements][sk] to [type checking][pre], as well as other work, the time to bootstrap the compiler decreased by 32%. Libraries --------- * The [`str::split_whitespace`] method splits a string on unicode whitespace boundaries. * On both Windows and Unix, new extension traits provide conversion of I/O types to and from the underlying system handles. On Unix, these traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle` and `AsRawHandle`. These are implemented for `File`, `TcpStream`, `TcpListener`, and `UpdSocket`. Further implementations for `std::process` will be stabilized later. * On Unix, [`std::os::unix::symlink`] creates symlinks. On Windows, symlinks can be created with `std::os::windows::symlink_dir` and `std::os::windows::symlink_file`. * The `mpsc::Receiver` type can now be converted into an iterator with `into_iter` on the [`IntoIterator`] trait. * `Ipv4Addr` can be created from `u32` with the `From` implementation of the [`From`] trait. * The `Debug` implementation for `RangeFull` [creates output that is more consistent with other implementations][rf]. * [`Debug` is implemented for `File`][file]. * The `Default` implementation for `Arc` [no longer requires `Sync + Send`][arc]. * [The `Iterator` methods `count`, `nth`, and `last` have been overridden for slices to have O(1) performance instead of O(n)][si]. * Incorrect handling of paths on Windows has been improved in both the compiler and the standard library. * [`AtomicPtr` gained a `Default` implementation][ap]. * In accordance with Rust's policy on arithmetic overflow `abs` now [panics on overflow when debug assertions are enabled][abs]. * The [`Cloned`] iterator, which was accidentally left unstable for 1.0 [has been stabilized][c]. * The [`Incoming`] iterator, which iterates over incoming TCP connections, and which was accidentally unnamable in 1.0, [is now properly exported][inc]. * [`BinaryHeap`] no longer corrupts itself [when functions called by `sift_up` or `sift_down` panic][bh]. * The [`split_off`] method of `LinkedList` [no longer corrupts the list in certain scenarios][ll]. Misc ---- * Type checking performance [has improved notably][sk] with [multiple improvements][pre]. * The compiler [suggests code changes][ch] for more errors. * rustc and it's build system have experimental support for [building toolchains against MUSL][m] instead of glibc on Linux. * The compiler defines the `target_env` cfg value, which is used for distinguishing toolchains that are otherwise for the same platform. Presently this is set to `gnu` for common GNU Linux targets and for MinGW targets, and `musl` for MUSL Linux targets. * The [`cargo rustc`][crc] command invokes a build with custom flags to rustc. * [Android executables are always position independent][pie]. * [The `drop_with_repr_extern` lint warns about mixing `repr(C)` with `Drop`][drop]. [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html [rf]: https://github.com/rust-lang/rust/pull/24491 [err-index]: https://doc.rust-lang.org/error-index.html [sk]: https://github.com/rust-lang/rust/pull/24615 [pre]: https://github.com/rust-lang/rust/pull/25323 [file]: https://github.com/rust-lang/rust/pull/24598 [ch]: https://github.com/rust-lang/rust/pull/24683 [arc]: https://github.com/rust-lang/rust/pull/24695 [si]: https://github.com/rust-lang/rust/pull/24701 [ap]: https://github.com/rust-lang/rust/pull/24834 [m]: https://github.com/rust-lang/rust/pull/24777 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md [crc]: https://github.com/rust-lang/cargo/pull/1568 [pie]: https://github.com/rust-lang/rust/pull/24953 [abs]: https://github.com/rust-lang/rust/pull/25441 [c]: https://github.com/rust-lang/rust/pull/25496 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html [inc]: https://github.com/rust-lang/rust/pull/25522 [bh]: https://github.com/rust-lang/rust/pull/25856 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html [ll]: https://github.com/rust-lang/rust/pull/26022 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off [drop]: https://github.com/rust-lang/rust/pull/24935 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][overflow]. Language -------- * Several [restrictions have been added to trait coherence][coh] in order to make it easier for upstream authors to change traits without breaking downstream code. * Digits of binary and octal literals are [lexed more eagerly][lex] to improve error messages and macro behavior. For example, `0b1234` is now lexed as `0b1234` instead of two tokens, `0b1` and `234`. * Trait bounds [are always invariant][inv], eliminating the need for the `PhantomFn` and `MarkerTrait` lang items, which have been removed. * ["-" is no longer a valid character in crate names][cr], the `extern crate "foo" as bar` syntax has been replaced with `extern crate foo as bar`, and Cargo now automatically translates "-" in *package* names to underscore for the crate name. * [Lifetime shadowing is an error][lt]. * [`Send` no longer implies `'static`][send-rfc]. * [UFCS now supports trait-less associated paths][moar-ufcs] like `MyType::default()`. * Primitive types [now have inherent methods][prim-inherent], obviating the need for extension traits like `SliceExt`. * Methods with `Self: Sized` in their `where` clause are [considered object-safe][self-sized], allowing many extension traits like `IteratorExt` to be merged into the traits they extended. * You can now [refer to associated types][assoc-where] whose corresponding trait bounds appear only in a `where` clause. * The final bits of [OIBIT landed][oibit-final], meaning that traits like `Send` and `Sync` are now library-defined. * A [Reflect trait][reflect] was introduced, which means that downcasting via the `Any` trait is effectively limited to concrete types. This helps retain the potentially-important "parametricity" property: generic code cannot behave differently for different type arguments except in minor ways. * The `unsafe_destructor` feature is now deprecated in favor of the [new `dropck`][dropck]. This change is a major reduction in unsafe code. Libraries --------- * The `thread_local` module [has been renamed to `std::thread`][th]. * The methods of `IteratorExt` [have been moved to the `Iterator` trait itself][ie]. * Several traits that implement Rust's conventions for type conversions, `AsMut`, `AsRef`, `From`, and `Into` have been [centralized in the `std::convert` module][con]. * The `FromError` trait [was removed in favor of `From`][fe]. * The basic sleep function [has moved to `std::thread::sleep_ms`][slp]. * The `splitn` function now takes an `n` parameter that represents the number of items yielded by the returned iterator [instead of the number of 'splits'][spl]. * [On Unix, all file descriptors are `CLOEXEC` by default][clo]. * [Derived implementations of `PartialOrd` now order enums according to their explicitly-assigned discriminants][po]. * [Methods for searching strings are generic over `Pattern`s][pat], implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and some others. * [In method resolution, object methods are resolved before inherent methods][meth]. * [`String::from_str` has been deprecated in favor of the `From` impl, `String::from`][sf]. * [`io::Error` implements `Sync`][ios]. * [The `words` method on `&str` has been replaced with `split_whitespace`][sw], to avoid answering the tricky question, 'what is a word?' * The new path and IO modules are complete and `#[stable]`. This was the major library focus for this cycle. * The path API was [revised][path-normalize] to normalize `.`, adjusting the tradeoffs in favor of the most common usage. * A large number of remaining APIs in `std` were also stabilized during this cycle; about 75% of the non-deprecated API surface is now stable. * The new [string pattern API][string-pattern] landed, which makes the string slice API much more internally consistent and flexible. * A new set of [generic conversion traits][conversion] replaced many existing ad hoc traits. * Generic numeric traits were [completely removed][num-traits]. This was made possible thanks to inherent methods for primitive types, and the removal gives maximal flexibility for designing a numeric hierarchy in the future. * The `Fn` traits are now related via [inheritance][fn-inherit] and provide ergonomic [blanket implementations][fn-blanket]. * The `Index` and `IndexMut` traits were changed to [take the index by value][index-value], enabling code like `hash_map["string"]` to work. * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all `Copy` data is known to be `Clone` as well. 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%][metadata-shrink]. * Much headway was made on ecosystem-wide CI, making it possible to [compare builds for breakage][ci-compare]. [crates.io]: http://crates.io [clo]: https://github.com/rust-lang/rust/pull/24034 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md [con]: https://github.com/rust-lang/rust/pull/23875 [cr]: https://github.com/rust-lang/rust/pull/23419 [fe]: https://github.com/rust-lang/rust/pull/23879 [ie]: https://github.com/rust-lang/rust/pull/23300 [inv]: https://github.com/rust-lang/rust/pull/23938 [ios]: https://github.com/rust-lang/rust/pull/24133 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md [lt]: https://github.com/rust-lang/rust/pull/24057 [meth]: https://github.com/rust-lang/rust/pull/24056 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md [po]: https://github.com/rust-lang/rust/pull/24270 [sf]: https://github.com/rust-lang/rust/pull/24517 [slp]: https://github.com/rust-lang/rust/pull/23949 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971 [self-sized]: https://github.com/rust-lang/rust/pull/22301 [assoc-where]: https://github.com/rust-lang/rust/pull/22512 [string-pattern]: https://github.com/rust-lang/rust/pull/22466 [oibit-final]: https://github.com/rust-lang/rust/pull/21689 [reflect]: https://github.com/rust-lang/rust/pull/23712 [conversion]: https://github.com/rust-lang/rfcs/pull/529 [num-traits]: https://github.com/rust-lang/rust/pull/23549 [index-value]: https://github.com/rust-lang/rust/pull/23601 [dropck]: https://github.com/rust-lang/rfcs/pull/769 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee [fn-inherit]: https://github.com/rust-lang/rust/pull/23282 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895 [copy-clone]: https://github.com/rust-lang/rust/pull/23860 [path-normalize]: https://github.com/rust-lang/rust/pull/23229 Version 1.0.0-alpha.2 (2015-02-20) ===================================== * ~1300 changes, numerous bugfixes * Highlights * The various I/O modules were [overhauled][io-rfc] 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][feat], so use of unstable libraries now requires a `#![feature(...)]` attribute. The impact of this change is [described on the forum][feat-forum]. [RFC][feat-rfc]. * Language * `for` loops [now operate on the `IntoIterator` trait][into], 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][into-rfc]. * Objects now have [default lifetime bounds][obj], so you don't have to write `Box` when you don't care about storing references. [RFC][obj-rfc]. * In types that implement `Drop`, [lifetimes must outlive the value][drop]. This will soon make it possible to safely implement `Drop` for types where `#[unsafe_destructor]` is now required. Read the [gorgeous RFC][drop-rfc] for details. * The fully qualified ::X syntax lets you set the Self type for a trait method or associated type. [RFC][ufcs-rfc]. * References to types that implement `Deref` now [automatically coerce to references][deref] to the dereferenced type `U`, e.g. `&T where T: Deref` automatically coerces to `&U`. This should eliminate many unsightly uses of `&*`, as when converting from references to vectors into references to slices. [RFC][deref-rfc]. * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`, `|:|`) is obsolete and closure kind is inferred from context. * [`Self` is a keyword][Self]. * Libraries * The `Show` and `String` formatting traits [have been renamed][fmt] 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][osstr], `std::ff::{OsString, OsStr}`, provide strings in platform-specific encodings for easier interop with system APIs. [RFC][osstr-rfc]. * The `boxed::into_raw` and `Box::from_raw` functions [convert between `Box` and `*mut T`][boxraw], a common pattern for creating raw pointers. * Tooling * Certain long error messages of the form 'expected foo found bar' are now [split neatly across multiple lines][multiline]. Examples in the PR. * On Unix Rust can be [uninstalled][un] by running `/usr/local/lib/rustlib/uninstall.sh`. * The `#[rustc_on_unimplemented]` attribute, requiring the 'on_unimplemented' feature, lets rustc [display custom error messages when a trait is expected to be implemented for a type but is not][onun]. * Misc * Rust is tested against a [LALR grammar][lalr], which parses almost all the Rust files that rustc does. [boxraw]: https://github.com/rust-lang/rust/pull/21318 [close]: https://github.com/rust-lang/rust/pull/21843 [deref]: https://github.com/rust-lang/rust/pull/21351 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md [drop]: https://github.com/rust-lang/rust/pull/21972 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md [feat]: https://github.com/rust-lang/rust/pull/21248 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md [fmt]: https://github.com/rust-lang/rust/pull/21457 [into]: https://github.com/rust-lang/rust/pull/20790 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md [lalr]: https://github.com/rust-lang/rust/pull/21452 [multiline]: https://github.com/rust-lang/rust/pull/19870 [obj]: https://github.com/rust-lang/rust/pull/22230 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md [onun]: https://github.com/rust-lang/rust/pull/20889 [osstr]: https://github.com/rust-lang/rust/pull/21488 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md [Self]: https://github.com/rust-lang/rust/pull/22158 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md [un]: https://github.com/rust-lang/rust/pull/22256 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 together and used generically in powerful ways. * Enum variants are [namespaced by their type names][enum]. * [`where` clauses][where] provide a more versatile and attractive syntax for specifying generic bounds, though the previous syntax remains valid. * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred numeric types. * Rust [no longer has a runtime][rt] of any description, and only supports OS threads, not green threads. * At long last, Rust has been overhauled for 'dynamically-sized types' ([DST]), which integrates 'fat pointers' (object types, arrays, and `str`) more deeply into the type system, making it more consistent. * Rust now has a general [range syntax][range], `i..j`, `i..`, and `..j` that produce range types and which, when combined with the `Index` operator and multidispatch, leads to a convenient slice notation, `[i..j]`. * The new range syntax revealed an ambiguity in the fixed-length array syntax, so now fixed length arrays [are written `[T; N]`][arrays]. * The `Copy` trait is no longer implemented automatically. Unsafe pointers no longer implement `Sync` and `Send` so types containing them don't automatically either. `Sync` and `Send` are now 'unsafe traits' so one can "forcibly" implement them via `unsafe impl` if a type confirms to the requirements for them even though the internals do not (e.g. structs containing unsafe pointers like `Arc`). These changes are intended to prevent some footguns and are collectively known as [opt-in built-in traits][oibit] (though `Sync` and `Send` will soon become pure library types unknown to the compiler). * Operator traits now take their operands [by value][ops], and comparison traits can use multidispatch to compare one type against multiple other types, allowing e.g. `String` to be compared with `&str`. * `if let` and `while let` are no longer feature-gated. * Rust has adopted a more [uniform syntax for escaping unicode characters][unicode]. * `macro_rules!` [has been declared stable][mac]. Though it is a flawed system it is sufficiently popular that it must be usable for 1.0. Effort has gone into [future-proofing][mac-future] it in ways that will allow other macro systems to be developed in parallel, and won't otherwise impact the evolution of the language. * The prelude has been [pared back significantly][prelude] such that it is the minimum necessary to support the most pervasive code patterns, and through [generalized where clauses][where] many of the prelude extension traits have been consolidated. * Rust's rudimentary reflection [has been removed][refl], as it incurred too much code generation for little benefit. * [Struct variants][structvars] are no longer feature-gated. * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also known as 'higher-ranked trait bounds', this crucially allows unboxed closures to work. * Macros invocations surrounded by parens or square brackets and not terminated by a semicolon are [parsed as expressions][macros], which makes expressions like `vec![1i32, 2, 3].len()` work as expected. * Trait objects now implement their traits automatically, and traits that can be coerced to objects now must be [object safe][objsafe]. * Automatically deriving traits is now done with `#[derive(...)]` not `#[deriving(...)]` for [consistency with other naming conventions][derive]. * Importing the containing module or enum at the same time as items or variants they contain is [now done with `self` instead of `mod`][self], as in use `foo::{self, bar}` * Glob imports are no longer feature-gated. * The `box` operator and `box` patterns have been feature-gated pending a redesign. For now unique boxes should be allocated like other containers, with `Box::new`. * Libraries * A [series][coll1] of [efforts][coll2] to establish [conventions][coll3] for collections types has resulted in API improvements throughout the standard library. * New [APIs for error handling][err] provide ergonomic interop between error types, and [new conventions][err-conv] describe more clearly the recommended error handling strategies in Rust. * The `fail!` macro has been renamed to [`panic!`][panic] so that it is easier to discuss failure in the context of error handling without making clarifications as to whether you are referring to the 'fail' macro or failure more generally. * On Linux, `OsRng` prefers the new, more reliable `getrandom` syscall when available. * The 'serialize' crate has been renamed 'rustc-serialize' and moved out of the distribution to Cargo. Although it is widely used now, it is expected to be superseded in the near future. * The `Show` formatter, typically implemented with `#[derive(Show)]` is [now requested with the `{:?}` specifier][show] and is intended for use by all types, for uses such as `println!` debugging. The new `String` formatter must be implemented by hand, uses the `{}` specifier, and is intended for full-fidelity conversions of things that can logically be represented as strings. * Tooling * [Flexible target specification][flex] allows rustc's code generation to be configured to support otherwise-unsupported platforms. * Rust comes with rust-gdb and rust-lldb scripts that launch their respective debuggers with Rust-appropriate pretty-printing. * The Windows installation of Rust is distributed with the the MinGW components currently required to link binaries on that platform. * Misc * Nullable enum optimizations have been extended to more types so that e.g. `Option>` and `Option` take up no more space than the inner types themselves. * Work has begun on supporting AArch64. [Cargo]: https://crates.io [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/ [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md [mac-future]: https://github.com/rust-lang/rfcs/pull/550 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/ [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871 [trpl]: https://doc.rust-lang.org/book/index.html [rbe]: http://rustbyexample.com/ Version 0.12.0 (2014-10-09) ============================= * ~1900 changes, numerous bugfixes * Highlights * The introductory documentation (now called The Rust Guide) has been completely rewritten, as have a number of supplementary guides. * Rust's package manager, Cargo, continues to improve and is sometimes considered to be quite awesome. * Many API's in `std` have been reviewed and updated for consistency with the in-development Rust coding guidelines. The standard library documentation tracks stabilization progress. * Minor libraries have been moved out-of-tree to the rust-lang org on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can be installed with Cargo. * Lifetime elision allows lifetime annotations to be left off of function declarations in many common scenarios. * Rust now works on 64-bit Windows. * Language * Indexing can be overloaded with the `Index` and `IndexMut` traits. * The `if let` construct takes a branch only if the `let` pattern matches, currently behind the 'if_let' feature gate. * 'where clauses', a more flexible syntax for specifying trait bounds that is more aesthetic, have been added for traits and free functions. Where clauses will in the future make it possible to constrain associated types, which would be impossible with the existing syntax. * A new slicing syntax (e.g. `[0..4]`) has been introduced behind the 'slicing_syntax' feature gate, and can be overloaded with the `Slice` or `SliceMut` traits. * The syntax for matching of sub-slices has been changed to use a postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for consistency with other uses of `..` and to future-proof potential additional uses of the syntax. * The syntax for matching inclusive ranges in patterns has changed from `0..3` to `0...4` to be consistent with the exclusive range syntax for slicing. * Matching of sub-slices in non-tail positions (e.g. `[a.., b, c]`) has been put behind the 'advanced_slice_patterns' feature gate and may be removed in the future. * Components of tuples and tuple structs can be extracted using the `value.0` syntax, currently behind the `tuple_indexing` feature gate. * The `#[crate_id]` attribute is no longer supported; versioning is handled by the package manager. * Renaming crate imports are now written `extern crate foo as bar` instead of `extern crate bar = foo`. * Renaming use statements are now written `use foo as bar` instead of `use bar = foo`. * `let` and `match` bindings and argument names in macros are now hygienic. * The new, more efficient, closure types ('unboxed closures') have been added under a feature gate, 'unboxed_closures'. These will soon replace the existing closure types, once higher-ranked trait lifetimes are added to the language. * `move` has been added as a keyword, for indicating closures that capture by value. * Mutation and assignment is no longer allowed in pattern guards. * Generic structs and enums can now have trait bounds. * The `Share` trait is now called `Sync` to free up the term 'shared' to refer to 'shared reference' (the default reference type. * Dynamically-sized types have been mostly implemented, unifying the behavior of fat-pointer types with the rest of the type system. * As part of dynamically-sized types, the `Sized` trait has been introduced, which qualifying types implement by default, and which type parameters expect by default. To specify that a type parameter does not need to be sized, write ``. Most types are `Sized`, notable exceptions being unsized arrays (`[T]`) and trait types. * Closures can return `!`, as in `|| -> !` or `proc() -> !`. * Lifetime bounds can now be applied to type parameters and object types. * The old, reference counted GC type, `Gc` which was once denoted by the `@` sigil, has finally been removed. GC will be revisited in the future. * Libraries * Library documentation has been improved for a number of modules. * Bit-vectors, collections::bitv has been modernized. * The url crate is deprecated in favor of http://github.com/servo/rust-url, which can be installed with Cargo. * Most I/O stream types can be cloned and subsequently closed from a different thread. * A `std::time::Duration` type has been added for use in I/O methods that rely on timers, as well as in the 'time' crate's `Timespec` arithmetic. * The runtime I/O abstraction layer that enabled the green thread scheduler to do non-thread-blocking I/O has been removed, along with the libuv-based implementation employed by the green thread scheduler. This will greatly simplify the future I/O work. * `collections::btree` has been rewritten to have a more idiomatic and efficient design. * Tooling * rustdoc output now indicates the stability levels of API's. * The `--crate-name` flag can specify the name of the crate being compiled, like `#[crate_name]`. * The `-C metadata` specifies additional metadata to hash into symbol names, and `-C extra-filename` specifies additional information to put into the output filename, for use by the package manager for versioning. * debug info generation has continued to improve and should be more reliable under both gdb and lldb. * rustc has experimental support for compiling in parallel using the `-C codegen-units` flag. * rustc no longer encodes rpath information into binaries by default. * Misc * Stack usage has been optimized with LLVM lifetime annotations. * Official Rust binaries on Linux are more compatible with older kernels and distributions, built on CentOS 5.10. Version 0.11.0 (2014-07-02) ========================== * ~1700 changes, numerous bugfixes * Language * ~[T] has been removed from the language. This type is superseded by the Vec type. * ~str has been removed from the language. This type is superseded by the String type. * ~T has been removed from the language. This type is superseded by the Box type. * @T has been removed from the language. This type is superseded by the standard library's std::gc::Gc type. * Struct fields are now all private by default. * Vector indices and shift amounts are both required to be a `uint` instead of any integral type. * Byte character, byte string, and raw byte string literals are now all supported by prefixing the normal literal with a `b`. * Multiple ABIs are no longer allowed in an ABI string * The syntax for lifetimes on closures/procedures has been tweaked slightly: `<'a>|A, B|: 'b + K -> T` * Floating point modulus has been removed from the language; however it is still provided by a library implementation. * Private enum variants are now disallowed. * The `priv` keyword has been removed from the language. * A closure can no longer be invoked through a &-pointer. * The `use foo, bar, baz;` syntax has been removed from the language. * The transmute intrinsic no longer works on type parameters. * Statics now allow blocks/items in their definition. * Trait bounds are separated from objects with + instead of : now. * Objects can no longer be read while they are mutably borrowed. * The address of a static is now marked as insignificant unless the #[inline(never)] attribute is placed it. * The #[unsafe_destructor] attribute is now behind a feature gate. * Struct literals are no longer allowed in ambiguous positions such as if, while, match, and for..in. * Declaration of lang items and intrinsics are now feature-gated by default. * Integral literals no longer default to `int`, and floating point literals no longer default to `f64`. Literals must be suffixed with an appropriate type if inference cannot determine the type of the literal. * The Box type is no longer implicitly borrowed to &mut T. * Procedures are now required to not capture borrowed references. * Libraries * The standard library is now a "facade" over a number of underlying libraries. This means that development on the standard library should be speeder due to smaller crates, as well as a clearer line between all dependencies. * A new library, libcore, lives under the standard library's facade which is Rust's "0-assumption" library, suitable for embedded and kernel development for example. * A regex crate has been added to the standard distribution. This crate includes statically compiled regular expressions. * The unwrap/unwrap_err methods on Result require a Show bound for better error messages. * The return types of the std::comm primitives have been centralized around the Result type. * A number of I/O primitives have gained the ability to time out their operations. * A number of I/O primitives have gained the ability to close their reading/writing halves to cancel pending operations. * Reverse iterator methods have been removed in favor of `rev()` on their forward-iteration counterparts. * A bitflags! macro has been added to enable easy interop with C and management of bit flags. * A debug_assert! macro is now provided which is disabled when `--cfg ndebug` is passed to the compiler. * A graphviz crate has been added for creating .dot files. * The std::cast module has been migrated into std::mem. * The std::local_data api has been migrated from freestanding functions to being based on methods. * The Pod trait has been renamed to Copy. * jemalloc has been added as the default allocator for types. * The API for allocating memory has been changed to use proper alignment and sized deallocation * Connecting a TcpStream or binding a TcpListener is now based on a string address and a u16 port. This allows connecting to a hostname as opposed to an IP. * The Reader trait now contains a core method, read_at_least(), which correctly handles many repeated 0-length reads. * The process-spawning API is now centered around a builder-style Command struct. * The :? printing qualifier has been moved from the standard library to an external libdebug crate. * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd have been renamed to Eq/Ord. * The select/plural methods have been removed from format!. The escapes for { and } have also changed from \{ and \} to {{ and }}, respectively. * The TaskBuilder API has been re-worked to be a true builder, and extension traits for spawning native/green tasks have been added. * Tooling * All breaking changes to the language or libraries now have their commit message annotated with `[breaking-change]` to allow for easy discovery of breaking changes. * The compiler will now try to suggest how to annotate lifetimes if a lifetime-related error occurs. * Debug info continues to be improved greatly with general bug fixes and better support for situations like link time optimization (LTO). * Usage of syntax extensions when cross-compiling has been fixed. * Functionality equivalent to GCC & Clang's -ffunction-sections, -fdata-sections and --gc-sections has been enabled by default * The compiler is now stricter about where it will load module files from when a module is declared via `mod foo;`. * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)]. Syntax extensions are now discovered via a "plugin registrar" type which will be extended in the future to other various plugins. * Lints have been restructured to allow for dynamically loadable lints. * A number of rustdoc improvements: * The HTML output has been visually redesigned. * Markdown is now powered by hoedown instead of sundown. * Searching heuristics have been greatly improved. * The search index has been reduced in size by a great amount. * Cross-crate documentation via `pub use` has been greatly improved. * Primitive types are now hyperlinked and documented. * Documentation has been moved from static.rust-lang.org/doc to doc.rust-lang.org * A new sandbox, play.rust-lang.org, is available for running and sharing rust code examples on-line. * Unused attributes are now more robustly warned about. * The dead_code lint now warns about unused struct fields. * Cross-compiling to iOS is now supported. * Cross-compiling to mipsel is now supported. * Stability attributes are now inherited by default and no longer apply to intra-crate usage, only inter-crate usage. * Error message related to non-exhaustive match expressions have been greatly improved. Version 0.10 (2014-04-03) ========================= * ~1500 changes, numerous bugfixes * Language * A new RFC process is now in place for modifying the language. * Patterns with `@`-pointers have been removed from the language. * Patterns with unique vectors (`~[T]`) have been removed from the language. * Patterns with unique strings (`~str`) have been removed from the language. * `@str` has been removed from the language. * `@[T]` has been removed from the language. * `@self` has been removed from the language. * `@Trait` has been removed from the language. * Headers on `~` allocations which contain `@` boxes inside the type for reference counting have been removed. * The semantics around the lifetimes of temporary expressions have changed, see #3511 and #11585 for more information. * Cross-crate syntax extensions are now possible, but feature gated. See #11151 for more information. This includes both `macro_rules!` macros as well as syntax extensions such as `format!`. * New lint modes have been added, and older ones have been turned on to be warn-by-default. * Unnecessary parentheses * Uppercase statics * Camel Case types * Uppercase variables * Publicly visible private types * `#[deriving]` with raw pointers * Unsafe functions can no longer be coerced to closures. * Various obscure macros such as `log_syntax!` are now behind feature gates. * The `#[simd]` attribute is now behind a feature gate. * Visibility is no longer allowed on `extern crate` statements, and unnecessary visibility (`priv`) is no longer allowed on `use` statements. * Trailing commas are now allowed in argument lists and tuple patterns. * The `do` keyword has been removed, it is now a reserved keyword. * Default type parameters have been implemented, but are feature gated. * Borrowed variables through captures in closures are now considered soundly. * `extern mod` is now `extern crate` * The `Freeze` trait has been removed. * The `Share` trait has been added for types that can be shared among threads. * Labels in macros are now hygienic. * Expression/statement macro invocations can be delimited with `{}` now. * Treatment of types allowed in `static mut` locations has been tweaked. * The `*` and `.` operators are now overloadable through the `Deref` and `DerefMut` traits. * `~Trait` and `proc` no longer have `Send` bounds by default. * Partial type hints are now supported with the `_` type marker. * An `Unsafe` type was introduced for interior mutability. It is now considered undefined to transmute from `&T` to `&mut T` without using the `Unsafe` type. * The #[linkage] attribute was implemented for extern statics/functions. * The inner attribute syntax has changed from `#[foo];` to `#![foo]`. * `Pod` was renamed to `Copy`. * Libraries * The `libextra` library has been removed. It has now been decomposed into component libraries with smaller and more focused nuggets of functionality. The full list of libraries can be found on the documentation index page. * std: `std::condition` has been removed. All I/O errors are now propagated through the `Result` type. In order to assist with error handling, a `try!` macro for unwrapping errors with an early return and a lint for unused results has been added. See #12039 for more information. * std: The `vec` module has been renamed to `slice`. * std: A new vector type, `Vec`, has been added in preparation for DST. This will become the only growable vector in the future. * std: `std::io` now has more public-reexports. Types such as `BufferedReader` are now found at `std::io::BufferedReader` instead of `std::io::buffered::BufferedReader`. * std: `print` and `println` are no longer in the prelude, the `print!` and `println!` macros are intended to be used instead. * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer attempts to statically prevent cycles. * std: The standard distribution is adopting the policy of pushing failure to the user rather than failing in libraries. Many functions (such as `slice::last()`) now return `Option` instead of `T` + failing. * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new deriving mode: `#[deriving(Show)]`. * std: `ToStr` is now implemented for all types implementing `Show`. * std: The formatting trait methods now take `&self` instead of `&T` * std: The `invert()` method on iterators has been renamed to `rev()` * std: `std::num` has seen a reduction in the genericity of its traits, consolidating functionality into a few core traits. * std: Backtraces are now printed on task failure if the environment variable `RUST_BACKTRACE` is present. * std: Naming conventions for iterators have been standardized. More details can be found on the wiki's style guide. * std: `eof()` has been removed from the `Reader` trait. Specific types may still implement the function. * std: Networking types are now cloneable to allow simultaneous reads/writes. * std: `assert_approx_eq!` has been removed * std: The `e` and `E` formatting specifiers for floats have been added to print them in exponential notation. * std: The `Times` trait has been removed * std: Indications of variance and opting out of builtin bounds is done through marker types in `std::kinds::marker` now * std: `hash` has been rewritten, `IterBytes` has been removed, and `#[deriving(Hash)]` is now possible. * std: `SharedChan` has been removed, `Sender` is now cloneable. * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`. * std: `Chan::new` is now `channel()`. * std: A new synchronous channel type has been implemented. * std: A `select!` macro is now provided for selecting over `Receiver`s. * std: `hashmap` and `trie` have been moved to `libcollections` * std: `run` has been rolled into `io::process` * std: `assert_eq!` now uses `{}` instead of `{:?}` * std: The equality and comparison traits have seen some reorganization. * std: `rand` has moved to `librand`. * std: `to_{lower,upper}case` has been implemented for `char`. * std: Logging has been moved to `liblog`. * collections: `HashMap` has been rewritten for higher performance and less memory usage. * native: The default runtime is now `libnative`. If `libgreen` is desired, it can be booted manually. The runtime guide has more information and examples. * native: All I/O functionality except signals has been implemented. * green: Task spawning with `libgreen` has been optimized with stack caching and various trimming of code. * green: Tasks spawned by `libgreen` now have an unmapped guard page. * sync: The `extra::sync` module has been updated to modern rust (and moved to the `sync` library), tweaking and improving various interfaces while dropping redundant functionality. * sync: A new `Barrier` type has been added to the `sync` library. * sync: An efficient mutex for native and green tasks has been implemented. * serialize: The `base64` module has seen some improvement. It treats newlines better, has non-string error values, and has seen general cleanup. * fourcc: A `fourcc!` macro was introduced * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a hexadecimal literal. * Tooling * `rustpkg` has been deprecated and removed from the main repository. Its replacement, `cargo`, is under development. * Nightly builds of rust are now available * The memory usage of rustc has been improved many times throughout this release cycle. * The build process supports disabling rpath support for the rustc binary itself. * Code generation has improved in some cases, giving more information to the LLVM optimization passes to enable more extensive optimizations. * Debuginfo compatibility with lldb on OSX has been restored. * The master branch is now gated on an android bot, making building for android much more reliable. * Output flags have been centralized into one `--emit` flag. * Crate type flags have been centralized into one `--crate-type` flag. * Codegen flags have been consolidated behind a `-C` flag. * Linking against outdated crates now has improved error messages. * Error messages with lifetimes will often suggest how to annotate the function to fix the error. * Many more types are documented in the standard library, and new guides were written. * Many `rustdoc` improvements: * code blocks are syntax highlighted. * render standalone markdown files. * the --test flag tests all code blocks by default. * exported macros are displayed. * reexported types have their documentation inlined at the location of the first reexport. * search works across crates that have been rendered to the same output directory. Version 0.9 (2014-01-09) ========================== * ~1800 changes, numerous bugfixes * Language * The `float` type has been removed. Use `f32` or `f64` instead. * A new facility for enabling experimental features (feature gating) has been added, using the crate-level `#[feature(foo)]` attribute. * Managed boxes (@) are now behind a feature gate (`#[feature(managed_boxes)]`) in preparation for future removal. Use the standard library's `Gc` or `Rc` types instead. * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead. * Jumping back to the top of a loop is now done with `continue` instead of `loop`. * Strings can no longer be mutated through index assignment. * Raw strings can be created via the basic `r"foo"` syntax or with matched hash delimiters, as in `r###"foo"###`. * `~fn` is now written `proc (args) -> retval { ... }` and may only be called once. * The `&fn` type is now written `|args| -> ret` to match the literal form. * `@fn`s have been removed. * `do` only works with procs in order to make it obvious what the cost of `do` is. * Single-element tuple-like structs can no longer be dereferenced to obtain the inner value. A more comprehensive solution for overloading the dereference operator will be provided in the future. * The `#[link(...)]` attribute has been replaced with `#[crate_id = "name#vers"]`. * Empty `impl`s must be terminated with empty braces and may not be terminated with a semicolon. * Keywords are no longer allowed as lifetime names; the `self` lifetime no longer has any special meaning. * The old `fmt!` string formatting macro has been removed. * `printf!` and `printfln!` (old-style formatting) removed in favor of `print!` and `println!`. * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`. * The `extern mod foo (name = "bar")` syntax has been removed. Use `extern mod foo = "bar"` instead. * New reserved keywords: `alignof`, `offsetof`, `sizeof`. * Macros can have attributes. * Macros can expand to items with attributes. * Macros can expand to multiple items. * The `asm!` macro is feature-gated (`#[feature(asm)]`). * Comments may be nested. * Values automatically coerce to trait objects they implement, without an explicit `as`. * Enum discriminants are no longer an entire word but as small as needed to contain all the variants. The `repr` attribute can be used to override the discriminant size, as in `#[repr(int)]` for integer-sized, and `#[repr(C)]` to match C enums. * Non-string literals are not allowed in attributes (they never worked). * The FFI now supports variadic functions. * Octal numeric literals, as in `0o7777`. * The `concat!` syntax extension performs compile-time string concatenation. * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been removed as Rust no longer uses segmented stacks. * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`). * Ignoring all fields of an enum variant or tuple-struct is done with `..`, not `*`; ignoring remaining fields of a struct is also done with `..`, not `_`; ignoring a slice of a vector is done with `..`, not `.._`. * `rustc` supports the "win64" calling convention via `extern "win64"`. * `rustc` supports the "system" calling convention, which defaults to the preferred convention for the target platform, "stdcall" on 32-bit Windows, "C" elsewhere. * The `type_overflow` lint (default: warn) checks literals for overflow. * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`. * The `attribute_usage` lint (default: warn) warns about unknown attributes. * The `unknown_features` lint (default: warn) warns about unknown feature gates. * The `dead_code` lint (default: warn) checks for dead code. * Rust libraries can be linked statically to one another * `#[link_args]` is behind the `link_args` feature gate. * Native libraries are now linked with `#[link(name = "foo")]` * Native libraries can be statically linked to a rust crate (`#[link(name = "foo", kind = "static")]`). * Native OS X frameworks are now officially supported (`#[link(name = "foo", kind = "framework")]`). * The `#[thread_local]` attribute creates thread-local (not task-local) variables. Currently behind the `thread_local` feature gate. * The `return` keyword may be used in closures. * Types that can be copied via a memcpy implement the `Pod` kind. * The `cfg` attribute can now be used on struct fields and enum variants. * Libraries * std: The `option` and `result` API's have been overhauled to make them simpler, more consistent, and more composable. * std: The entire `std::io` module has been replaced with one that is more comprehensive and that properly interfaces with the underlying scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all implemented. * std: `io::util` contains a number of useful implementations of `Reader` and `Writer`, including `NullReader`, `NullWriter`, `ZeroReader`, `TeeReader`. * std: The reference counted pointer type `extra::rc` moved into std. * std: The `Gc` type in the `gc` module will replace `@` (it is currently just a wrapper around it). * std: The `Either` type has been removed. * std: `fmt::Default` can be implemented for any type to provide default formatting to the `format!` macro, as in `format!("{}", myfoo)`. * std: The `rand` API continues to be tweaked. * std: The `rust_begin_unwind` function, useful for inserting breakpoints on failure in gdb, is now named `rust_fail`. * std: The `each_key` and `each_value` methods on `HashMap` have been replaced by the `keys` and `values` iterators. * std: Functions dealing with type size and alignment have moved from the `sys` module to the `mem` module. * std: The `path` module was written and API changed. * std: `str::from_utf8` has been changed to cast instead of allocate. * std: `starts_with` and `ends_with` methods added to vectors via the `ImmutableEqVector` trait, which is in the prelude. * std: Vectors can be indexed with the `get_opt` method, which returns `None` if the index is out of bounds. * std: Task failure no longer propagates between tasks, as the model was complex, expensive, and incompatible with thread-based tasks. * std: The `Any` type can be used for dynamic typing. * std: `~Any` can be passed to the `fail!` macro and retrieved via `task::try`. * std: Methods that produce iterators generally do not have an `_iter` suffix now. * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability roots (mutable fields, etc.). Use instead of e.g. `@mut`. * std: `util::ignore` renamed to `prelude::drop`. * std: Slices have `sort` and `sort_by` methods via the `MutableVector` trait. * std: `vec::raw` has seen a lot of cleanup and API changes. * std: The standard library no longer includes any C++ code, and very minimal C, eliminating the dependency on libstdc++. * std: Runtime scheduling and I/O functionality has been factored out into extensible interfaces and is now implemented by two different crates: libnative, for native threading and I/O; and libgreen, for green threading and I/O. This paves the way for using the standard library in more limited embedded environments. * std: The `comm` module has been rewritten to be much faster, have a simpler, more consistent API, and to work for both native and green threading. * std: All libuv dependencies have been moved into the rustuv crate. * native: New implementations of runtime scheduling on top of OS threads. * native: New native implementations of TCP, UDP, file I/O, process spawning, and other I/O. * green: The green thread scheduler and message passing types are almost entirely lock-free. * extra: The `flatpipes` module had bitrotted and was removed. * extra: All crypto functions have been removed and Rust now has a policy of not reimplementing crypto in the standard library. In the future crypto will be provided by external crates with bindings to established libraries. * extra: `c_vec` has been modernized. * extra: The `sort` module has been removed. Use the `sort` method on mutable slices. * Tooling * The `rust` and `rusti` commands have been removed, due to lack of maintenance. * `rustdoc` was completely rewritten. * `rustdoc` can test code examples in documentation. * `rustpkg` can test packages with the argument, 'test'. * `rustpkg` supports arbitrary dependencies, including C libraries. * `rustc`'s support for generating debug info is improved again. * `rustc` has better error reporting for unbalanced delimiters. * `rustc`'s JIT support was removed due to bitrot. * Executables and static libraries can be built with LTO (-Z lto) * `rustc` adds a `--dep-info` flag for communicating dependencies to build tools. Version 0.8 (2013-09-26) ============================ * ~2200 changes, numerous bugfixes * Language * The `for` loop syntax has changed to work with the `Iterator` trait. * At long last, unwinding works on Windows. * Default methods are ready for use. * Many trait inheritance bugs fixed. * Owned and borrowed trait objects work more reliably. * `copy` is no longer a keyword. It has been replaced by the `Clone` trait. * rustc can omit emission of code for the `debug!` macro if it is passed `--cfg ndebug` * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look for foo.rs, then foo/mod.rs, and will generate an error when both are present. * Strings no longer contain trailing nulls. The new `std::c_str` module provides new mechanisms for converting to C strings. * The type of foreign functions is now `extern "C" fn` instead of `*u8'. * The FFI has been overhauled such that foreign functions are called directly, instead of through a stack-switching wrapper. * Calling a foreign function must be done through a Rust function with the `#[fixed_stack_segment]` attribute. * The `externfn!` macro can be used to declare both a foreign function and a `#[fixed_stack_segment]` wrapper at once. * `pub` and `priv` modifiers on `extern` blocks are no longer parsed. * `unsafe` is no longer allowed on extern fns - they are all unsafe. * `priv` is disallowed everywhere except for struct fields and enum variants. * `&T` (besides `&'static T`) is no longer allowed in `@T`. * `ref` bindings in irrefutable patterns work correctly now. * `char` is now prevented from containing invalid code points. * Casting to `bool` is no longer allowed. * `\0` is now accepted as an escape in chars and strings. * `yield` is a reserved keyword. * `typeof` is a reserved keyword. * Crates may be imported by URL with `extern mod foo = "url";`. * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }` * Static vectors can be initialized with repeating elements, e.g. `static foo: [u8, .. 100]: [0, .. 100];`. * Static structs can be initialized with functional record update, e.g. `static foo: Foo = Foo { a: 5, .. bar };`. * `cfg!` can be used to conditionally execute code based on the crate configuration, similarly to `#[cfg(...)]`. * The `unnecessary_qualification` lint detects unneeded module prefixes (default: allow). * Arithmetic operations have been implemented on the SIMD types in `std::unstable::simd`. * Exchange allocation headers were removed, reducing memory usage. * `format!` implements a completely new, extensible, and higher-performance string formatting system. It will replace `fmt!`. * `print!` and `println!` write formatted strings (using the `format!` extension) to stdout. * `write!` and `writeln!` write formatted strings (using the `format!` extension) to the new Writers in `std::rt::io`. * The library section in which a function or static is placed may be specified with `#[link_section = "..."]`. * The `proto!` syntax extension for defining bounded message protocols was removed. * `macro_rules!` is hygienic for `let` declarations. * The `#[export_name]` attribute specifies the name of a symbol. * `unreachable!` can be used to indicate unreachable code, and fails if executed. * Libraries * std: Transitioned to the new runtime, written in Rust. * std: Added an experimental I/O library, `rt::io`, based on the new runtime. * std: A new generic `range` function was added to the prelude, replacing `uint::range` and friends. * std: `range_rev` no longer exists. Since range is an iterator it can be reversed with `range(lo, hi).invert()`. * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default` renamed to `unwrap_or`. * std: The `iterator` module was renamed to `iter`. * std: Integral types now support the `checked_add`, `checked_sub`, and `checked_mul` operations for detecting overflow. * std: Many methods in `str`, `vec`, `option, `result` were renamed for consistency. * std: Methods are standardizing on conventions for casting methods: `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary and cheap casts. * std: The `CString` type in `c_str` provides new ways to convert to and from C strings. * std: `DoubleEndedIterator` can yield elements in two directions. * std: The `mut_split` method on vectors partitions an `&mut [T]` into two splices. * std: `str::from_bytes` renamed to `str::from_utf8`. * std: `pop_opt` and `shift_opt` methods added to vectors. * std: The task-local data interface no longer uses @, and keys are no longer function pointers. * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`. * std: Added `SharedPort` to `comm`. * std: `Eq` has a default method for `ne`; only `eq` is required in implementations. * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt` is required in implementations. * std: `is_utf8` performance is improved, impacting many string functions. * std: `os::MemoryMap` provides cross-platform mmap. * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that are not 'in-bounds' are considered undefined. * std: Many freestanding functions in `vec` removed in favor of methods. * std: Many freestanding functions on scalar types removed in favor of methods. * std: Many options to task builders were removed since they don't make sense in the new scheduler design. * std: More containers implement `FromIterator` so can be created by the `collect` method. * std: More complete atomic types in `unstable::atomics`. * std: `comm::PortSet` removed. * std: Mutating methods in the `Set` and `Map` traits have been moved into the `MutableSet` and `MutableMap` traits. `Container::is_empty`, `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have default implementations. * std: Various `from_str` functions were removed in favor of a generic `from_str` which is available in the prelude. * std: `util::unreachable` removed in favor of the `unreachable!` macro. * extra: `dlist`, the doubly-linked list was modernized. * extra: Added a `hex` module with `ToHex` and `FromHex` traits. * extra: Added `glob` module, replacing `std::os::glob`. * extra: `rope` was removed. * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`. * extra: `net`, and `timer` were removed. The experimental replacements are `std::rt::io::net` and `std::rt::io::timer`. * extra: Iterators implemented for `SmallIntMap`. * extra: Iterators implemented for `Bitv` and `BitvSet`. * extra: `SmallIntSet` removed. Use `BitvSet`. * extra: Performance of JSON parsing greatly improved. * extra: `semver` updated to SemVer 2.0.0. * extra: `term` handles more terminals correctly. * extra: `dbg` module removed. * extra: `par` module removed. * extra: `future` was cleaned up, with some method renames. * extra: Most free functions in `getopts` were converted to methods. * Other * rustc's debug info generation (`-Z debug-info`) is greatly improved. * rustc accepts `--target-cpu` to compile to a specific CPU architecture, similarly to gcc's `--march` flag. * rustc's performance compiling small crates is much better. * rustpkg has received many improvements. * rustpkg supports git tags as package IDs. * rustpkg builds into target-specific directories so it can be used for cross-compiling. * The number of concurrent test tasks is controlled by the environment variable RUST_TEST_TASKS. * The test harness can now report metrics for benchmarks. * All tools have man pages. * Programs compiled with `--test` now support the `-h` and `--help` flags. * The runtime uses jemalloc for allocations. * Segmented stacks are temporarily disabled as part of the transition to the new runtime. Stack overflows are possible! * A new documentation backend, rustdoc_ng, is available for use. It is still invoked through the normal `rustdoc` command. Version 0.7 (2013-07-03) ======================= * ~2000 changes, numerous bugfixes * Language * `impl`s no longer accept a visibility qualifier. Put them on methods instead. * The borrow checker has been rewritten with flow-sensitivity, fixing many bugs and inconveniences. * The `self` parameter no longer implicitly means `&'self self`, and can be explicitly marked with a lifetime. * Overloadable compound operators (`+=`, etc.) have been temporarily removed due to bugs. * The `for` loop protocol now requires `for`-iterators to return `bool` so they compose better. * The `Durable` trait is replaced with the `'static` bounds. * Trait default methods work more often. * Structs with the `#[packed]` attribute have byte alignment and no padding between fields. * Type parameters bound by `Copy` must now be copied explicitly with the `copy` keyword. * It is now illegal to move out of a dereferenced unsafe pointer. * `Option<~T>` is now represented as a nullable pointer. * `@mut` does dynamic borrow checks correctly. * The `main` function is only detected at the topmost level of the crate. The `#[main]` attribute is still valid anywhere. * Struct fields may no longer be mutable. Use inherited mutability. * The `#[no_send]` attribute makes a type that would otherwise be `Send`, not. * The `#[no_freeze]` attribute makes a type that would otherwise be `Freeze`, not. * Unbounded recursion will abort the process after reaching the limit specified by the `RUST_MAX_STACK` environment variable (default: 1GB). * The `vecs_implicitly_copyable` lint mode has been removed. Vectors are never implicitly copyable. * `#[static_assert]` makes compile-time assertions about static bools. * At long last, 'argument modes' no longer exist. * The rarely used `use mod` statement no longer exists. * Syntax extensions * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style argument list. * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`, `Rand`, `Zero` and `ToStr` can all be automatically derived with `#[deriving(...)]`. * The `bytes!` macro returns a vector of bytes for string, u8, char, and unsuffixed integer literals. * Libraries * The `core` crate was renamed to `std`. * The `std` crate was renamed to `extra`. * More and improved documentation. * std: `iterator` module for external iterator objects. * Many old-style (internal, higher-order function) iterators replaced by implementations of `Iterator`. * std: Many old internal vector and string iterators, incl. `any`, `all`. removed. * std: The `finalize` method of `Drop` renamed to `drop`. * std: The `drop` method now takes `&mut self` instead of `&self`. * std: The prelude no longer reexports any modules, only types and traits. * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`, `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits. * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`, `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`. * std: Tuple traits and accessors defined for up to 12-tuples, e.g. `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`. * std: Many types implement `Clone`. * std: `path` type renamed to `Path`. * std: `mut` module and `Mut` type removed. * std: Many standalone functions removed in favor of methods and iterators in `vec`, `str`. In the future methods will also work as functions. * std: `reinterpret_cast` removed. Use `transmute`. * std: ascii string handling in `std::ascii`. * std: `Rand` is implemented for ~/@. * std: `run` module for spawning processes overhauled. * std: Various atomic types added to `unstable::atomic`. * std: Various types implement `Zero`. * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`. * std: Borrowed pointer functions moved from `ptr` to `borrow`. * std: Added `os::mkdir_recursive`. * std: Added `os::glob` function performs filesystems globs. * std: `FuzzyEq` renamed to `ApproxEq`. * std: `Map` now defines `pop` and `swap` methods. * std: `Cell` constructors converted to static methods. * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`. * extra: `flate` module moved from `std` to `extra`. * extra: `fileinput` module for iterating over a series of files. * extra: `Complex` number type and `complex` module. * extra: `Rational` number type and `rational` module. * extra: `BigInt`, `BigUint` implement numeric and comparison traits. * extra: `term` uses terminfo now, is more correct. * extra: `arc` functions converted to methods. * extra: Implementation of fixed output size variations of SHA-2. * Tooling * `unused_variable` lint mode for unused variables (default: warn). * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks (default: warn). * `unused_mut` lint mode for identifying unused `mut` qualifiers (default: warn). * `dead_assignment` lint mode for unread variables (default: warn). * `unnecessary_allocation` lint mode detects some heap allocations that are immediately borrowed so could be written without allocating (default: warn). * `missing_doc` lint mode (default: allow). * `unreachable_code` lint mode (default: warn). * The `rusti` command has been rewritten and a number of bugs addressed. * rustc outputs in color on more terminals. * rustc accepts a `--link-args` flag to pass arguments to the linker. * rustc accepts a `-Z print-link-args` flag for debugging linkage. * Compiling with `-g` will make the binary record information about dynamic borrowcheck failures for debugging. * rustdoc has a nicer stylesheet. * Various improvements to rustdoc. * Improvements to rustpkg (see the detailed release notes). Version 0.6 (2013-04-03) ======================== * ~2100 changes, numerous bugfixes * Syntax changes * The self type parameter in traits is now spelled `Self` * The `self` parameter in trait and impl methods must now be explicitly named (for example: `fn f(&self) { }`). Implicit self is deprecated. * Static methods no longer require the `static` keyword and instead are distinguished by the lack of a `self` parameter * Replaced the `Durable` trait with the `'static` lifetime * The old closure type syntax with the trailing sigil has been removed in favor of the more consistent leading sigil * `super` is a keyword, and may be prefixed to paths * Trait bounds are separated with `+` instead of whitespace * Traits are implemented with `impl Trait for Type` instead of `impl Type: Trait` * Lifetime syntax is now `&'l foo` instead of `&l/foo` * The `export` keyword has finally been removed * The `move` keyword has been removed (see "Semantic changes") * The interior mutability qualifier on vectors, `[mut T]`, has been removed. Use `&mut [T]`, etc. * `mut` is no longer valid in `~mut T`. Use inherited mutability * `fail` is no longer a keyword. Use `fail!()` * `assert` is no longer a keyword. Use `assert!()` * `log` is no longer a keyword. use `debug!`, etc. * 1-tuples may be represented as `(T,)` * Struct fields may no longer be `mut`. Use inherited mutability, `@mut T`, `core::mut` or `core::cell` * `extern mod { ... }` is no longer valid syntax for foreign function modules. Use extern blocks: `extern { ... }` * Newtype enums removed. Use tuple-structs. * Trait implementations no longer support visibility modifiers * Pattern matching over vectors improved and expanded * `const` renamed to `static` to correspond to lifetime name, and make room for future `static mut` unsafe mutable globals. * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc. * `Clone` implementations can be automatically generated with `#[deriving(Clone)]` * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar` instead of `foo as Bar`. * Fixed length vector types are now written as `[int, .. 3]` instead of `[int * 3]`. * Fixed length vector types can express the length as a constant expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`) * Semantic changes * Types with owned pointers or custom destructors move by default, eliminating the `move` keyword * All foreign functions are considered unsafe * &mut is now unaliasable * Writes to borrowed @mut pointers are prevented dynamically * () has size 0 * The name of the main function can be customized using #[main] * The default type of an inferred closure is &fn instead of @fn * `use` statements may no longer be "chained" - they cannot import identifiers imported by previous `use` statements * `use` statements are crate relative, importing from the "top" of the crate by default. Paths may be prefixed with `super::` or `self::` to change the search behavior. * Method visibility is inherited from the implementation declaration * Structural records have been removed * Many more types can be used in static items, including enums 'static-lifetime pointers and vectors * Pattern matching over vectors improved and expanded * Typechecking of closure types has been overhauled to improve inference and eliminate unsoundness * Macros leave scope at the end of modules, unless that module is tagged with #[macro_escape] * Libraries * Added big integers to `std::bigint` * Removed `core::oldcomm` module * Added pipe-based `core::comm` module * Numeric traits have been reorganized under `core::num` * `vec::slice` finally returns a slice * `debug!` and friends don't require a format string, e.g. `debug!(Foo)` * Containers reorganized around traits in `core::container` * `core::dvec` removed, `~[T]` is a drop-in replacement * `core::send_map` renamed to `core::hashmap` * `std::map` removed; replaced with `core::hashmap` * `std::treemap` reimplemented as an owned balanced tree * `std::deque` and `std::smallintmap` reimplemented as owned containers * `core::trie` added as a fast ordered map for integer keys * Set types added to `core::hashmap`, `core::trie` and `std::treemap` * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to overload the comparison operators, whereas `TotalOrd` is used by certain container types * Other * Replaced the 'cargo' package manager with 'rustpkg' * Added all-purpose 'rust' tool * `rustc --test` now supports benchmarks with the `#[bench]` attribute * rustc now *attempts* to offer spelling suggestions * Improved support for ARM and Android * Preliminary MIPS backend * Improved foreign function ABI implementation for x86, x86_64 * Various memory usage improvements * Rust code may be embedded in foreign code under limited circumstances * Inline assembler supported by new asm!() syntax extension. Version 0.5 (2012-12-21) =========================== * ~900 changes, numerous bugfixes * Syntax changes * Removed `<-` move operator * Completed the transition from the `#fmt` extension syntax to `fmt!` * Removed old fixed length vector syntax - `[T]/N` * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc. * Macros may now expand to items and statements * `a.b()` is always parsed as a method call, never as a field projection * `Eq` and `IterBytes` implementations can be automatically generated with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively * Removed the special crate language for `.rc` files * Function arguments may consist of any irrefutable pattern * Semantic changes * `&` and `~` pointers may point to objects * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums. * Enum variants may be structs * Destructors can be added to all nominal types with the Drop trait * Structs and nullary enum variants may be constants * Values that cannot be implicitly copied are now automatically moved without writing `move` explicitly * `&T` may now be coerced to `*T` * Coercions happen in `let` statements as well as function calls * `use` statements now take crate-relative paths * The module and type namespaces have been merged so that static method names can be resolved under the trait in which they are declared * Improved support for language features * Trait inheritance works in many scenarios * More support for explicit self arguments in methods - `self`, `&self` `@self`, and `~self` all generally work as expected * Static methods work in more situations * Experimental: Traits may declare default methods for the implementations to use * Libraries * New condition handling system in `core::condition` * Timsort added to `std::sort` * New priority queue, `std::priority_queue` * Pipes for serializable types, `std::flatpipes' * Serialization overhauled to be trait-based * Expanded `getopts` definitions * Moved futures to `std` * More functions are pure now * `core::comm` renamed to `oldcomm`. Still deprecated * `rustdoc` and `cargo` are libraries now * Misc * Added a preliminary REPL, `rusti` * License changed from MIT to dual MIT/APL2 Version 0.4 (2012-10-15) ========================== * ~2000 changes, numerous bugfixes * Syntax * All keywords are now strict and may not be used as identifiers anywhere * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send', 'of', 'with', 'to', 'class'. * Classes are replaced with simpler structs * Explicit method self types * `ret` became `return` and `alt` became `match` * `import` is now `use`; `use is now `extern mod` * `extern mod { ... }` is now `extern { ... }` * `use mod` is the recommended way to import modules * `pub` and `priv` replace deprecated export lists * The syntax of `match` pattern arms now uses fat arrow (=>) * `main` no longer accepts an args vector; use `os::args` instead * Semantics * Trait implementations are now coherent, ala Haskell typeclasses * Trait methods may be static * Argument modes are deprecated * Borrowed pointers are much more mature and recommended for use * Strings and vectors in the static region are stored in constant memory * Typestate was removed * Resolution rewritten to be more reliable * Support for 'dual-mode' data structures (freezing and thawing) * Libraries * Most binary operators can now be overloaded via the traits in `core::ops' * `std::net::url` for representing URLs * Sendable hash maps in `core::send_map` * `core::task' gained a (currently unsafe) task-local storage API * Concurrency * An efficient new intertask communication primitive called the pipe, along with a number of higher-level channel types, in `core::pipes` * `std::arc`, an atomically reference counted, immutable, shared memory type * `std::sync`, various exotic synchronization tools based on arcs and pipes * Futures are now based on pipes and sendable * More robust linked task failure * Improved task builder API * Other * Improved error reporting * Preliminary JIT support * Preliminary work on precise GC * Extensive architectural improvements to rustc * Begun a transition away from buggy C++-based reflection (shape) code to Rust-based (visitor) code * All hash functions and tables converted to secure, randomized SipHash Version 0.3 (2012-07-12) ======================== * ~1900 changes, numerous bugfixes * New coding conveniences * Integer-literal suffix inference * Per-item control over warnings, errors * #[cfg(windows)] and #[cfg(unix)] attributes * Documentation comments * More compact closure syntax * 'do' expressions for treating higher-order functions as control structures * *-patterns (wildcard extended to all constructor fields) * Semantic cleanup * Name resolution pass and exhaustiveness checker rewritten * Region pointers and borrow checking supersede alias analysis * Init-ness checking is now provided by a region-based liveness pass instead of the typestate pass; same for last-use analysis * Extensive work on region pointers * Experimental new language features * Slices and fixed-size, interior-allocated vectors * #!-comments for lang versioning, shell execution * Destructors and iface implementation for classes; type-parameterized classes and class methods * 'const' type kind for types that can be used to implement shared-memory concurrency patterns * Type reflection * Removal of various obsolete features * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind', 'crust', 'native' (now 'extern'), 'cont' (now 'again') * Constructs: do-while loops ('do' repurposed), fn binding, resources (replaced by destructors) * Compiler reorganization * Syntax-layer of compiler split into separate crate * Clang (from LLVM project) integrated into build * Typechecker split into sub-modules * New library code * New time functions * Extension methods for many built-in types * Arc: atomic-refcount read-only / exclusive-use shared cells * Par: parallel map and search routines * Extensive work on libuv interface * Much vector code moved to libraries * Syntax extensions: #line, #col, #file, #mod, #stringify, #include, #include_str, #include_bin * Tool improvements * Cargo automatically resolves dependencies Version 0.2 (2012-03-29) ========================= * >1500 changes, numerous bugfixes * New docs and doc tooling * New port: FreeBSD x86_64 * Compilation model enhancements * Generics now specialized, multiply instantiated * Functions now inlined across separate crates * Scheduling, stack and threading fixes * Noticeably improved message-passing performance * Explicit schedulers * Callbacks from C * Helgrind clean * Experimental new language features * Operator overloading * Region pointers * Classes * Various language extensions * C-callback function types: 'crust fn ...' * Infinite-loop construct: 'loop { ... }' * Shorten 'mutable' to 'mut' * Required mutable-local qualifier: 'let mut ...' * Basic glob-exporting: 'export foo::*;' * Alt now exhaustive, 'alt check' for runtime-checked * Block-function form of 'for' loop, with 'break' and 'ret'. * New library code * AST quasi-quote syntax extension * Revived libuv interface * New modules: core::{future, iter}, std::arena * Merged per-platform std::{os*, fs*} to core::{libc, os} * Extensive cleanup, regularization in libstd, libcore Version 0.1 (2012-01-20) =============================== * Most language features work, including: * Unique pointers, unique closures, move semantics * Interface-constrained generics * Static interface dispatch * Stack growth * Multithread task scheduling * Typestate predicates * Failure unwinding, destructors * Pattern matching and destructuring assignment * Lightweight block-lambda syntax * Preliminary macro-by-example * Compiler works with the following configurations: * Linux: x86 and x86_64 hosts and targets * MacOS: x86 and x86_64 hosts and targets * Windows: x86 hosts and targets * Cross compilation / multi-target configuration supported. * Preliminary API-documentation and package-management tools included. Known issues: * Documentation is incomplete. * Performance is below intended target. * Standard library APIs are subject to extensive change, reorganization. * Language-level versioning is not yet operational - future code will break unexpectedly.