Added overview of the debuginfo module at the beginning of debuginfo.rs.
Fixed compiler warnings about unnecessary string allocations in debuginfo.rs
Reordered debuginfo.rs and commented public fns
debuginfo.rs: Removed some static constants not used anymore.
debuginfo.rs: Explained why a function is called although one could think it should not be.
debuginfo.rs: Removed trailing whitespace.
Make task_rng() return @mut R instead of @@mut R
Remove `ast::pure_fn` and all concept of `pure` from the compiler
replaced some 'std::' with 'extra::' in comments
Cleaned up middle a bit.

The only really tricky change is that a long chain of ifs, and elses
was turned into a single if, and a match in astencode.rs. Some methods
can only be called in certain cases, and so have to come after the if.
abi: remove dead code

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
compiletest: Shorten test names
iterator: Add `IteratorUtil::flat_map_` method

flat_map_ produces an iterator that maps each element to an iterator,
and yields the elements of the produced iterators.

This is the monadic bind :: M a -> (a -> M b) -> M b  for iterators.

Named just like the vec method, but with a trailing underline until the
method resolution bug is resolved.
Un-xfail working test
vim/syntax/rust.vim: fix date header

The last change was made in 2013 not 2012.
Merge remote-tracking branch 'cmr/issue/2773' into HEAD
Merge remote-tracking branch 'artagnon/abi-dead-code' into HEAD
Merge remote-tracking branch 'reusee/master' into HEAD
Merge remote-tracking branch 'brson/shorttestnames' into HEAD
Merge remote-tracking branch 'sstewartgallus/cleanup_middle' into incoming