Rust 0.7.0

* ~2000 changes, numerous bugfixes

* Language

* impls 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 re-exports 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_variables 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).