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0.8 release notes

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Brian Anderson 2013-09-18 18:51:48 -07:00
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Version 0.8 (October 2013)
--------------------------
* ~2100 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 definitely mostly work.
* 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 It has been replaced by the `Clone` trait.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 no longer emits code for the `debug!` macro unless it is passed
`--cfg debug`
* 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.
* `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 hygenic 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 `le`; 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.
* 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.
* 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.
* 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!
Version 0.7 (July 2013)
-----------------------