Welcome to another issue of This Week in Rust.

What's cooking on master?

46 PRs were merged this week.

Breaking changes

std::rt::io has moved on to become std::io. Yay!
The #[fixed_stack_segment] attribute has been removed.
as casts to functions are no longer allowed.
The return value of the io::process is no longer an int, but an enum that also represents termination by signal. It's also ostensibly more portable: to check if a subprocess succeeded, just call .success() on the return value.
std::cast::unsafe_copy has has been removed. It is identical to std::ptr::read_ptr.
Trailing :: is no longer allowed in paths

Vectors have more overflow checking. This was the cause of a few mysterious segfaults.
Crate maps can now be generated for libraries, for when you want to embed a Rust library in a non-Rust application.
Creation of buffered readers/writers has been optimized a bit.
If you use OS X, you'll be happy to see that the frivolous "no debug symbols in executable" warning has been stomped out.
The missing-documentation lint is now more accepting, and won't warn about private items.
BufWriter, an implementation of Writer for already-existing buffers, is now implemented.
The native IO backend has seen a good boost; it will now be seamlessly fallen back to when the libuv backend isn't available (you can test this out by adding #[no_uv]; to your crates).
A lint for numeric literals which overflow their type has been implemented.
A Buffer trait has been added to std::io, with read_line, read_until, and read_char.
The error message when the trait's method declaration and the method declaration in the implementation aren't the same now includes the trait name.
The libuv bindings were largely rewritten for performance, at the sacrifice of some flexibility (which was of questionable value).
_-prefixed variables no longer get an unused mut warning.