Mozilla 發布的編程語言，Rust 0.3 發布
Rust 0.3 發布了，Rust 是 Mozilla 目前正在開發一個新的編程語言，由web語言的領軍人物Brendan Eich（js之父），Dave Herman以及Mozilla公司的Graydon Hoare 合力開發。
創建這個新語言的目的是為了解決一個很頑疾的問題：軟件的演進速度大大低于硬件的演進，軟件在語言級別上無法真正利用多核計算帶來的性能提升。Rust是針對多核體系提出的語言，并且吸收一些其他動態語言的重要特性，比如不需要管理內存，比如不會出現Null指針等等。
Rust 最早是在Mozilla的社區峰會上公之于眾的，當時就有人問以后是否會用Rust重寫Firefox，Brenda說希望如此。Rust目前還處于初期的開發階段，開發團隊目前并不想花太多的時間在語法上，不過他們還是提供了一小段代碼：
iter pairs() -> tup(int,int) {
let int i = 0;
let int j = 0;
while (i < 10) {
put tup(i, j);
i += 1;
j += i;
}
}
fn main() {
let int i = 10;
let int j = 0;
for each (tup(int,int) p in pairs()) {
log p._0;
log p._1;
check (p._0 + 10 == i);
i += 1;
j = p._1;
}
check(j == 45);
}</pre>
Rust 0.3 Changes：
* ~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
</pre>
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