Add debug info for boxes
Add debug info for vectors
Add debug info for bare_fn type
Prevent debug info generation of zero-span nodes

If a node has a (0, 0) span, it was not in the source, so debug symbols should not be generated for it.
Add debug info test for boxes
Add debug info test for vectors
rustpkg: Fail when crate inference fails; inject link attributes

1. Fail when there's no package script and no crates named
main.rs, lib.rs, bench.rs, or test.rs.

2. Inject the crate link_meta "name" and "vers" attributes, so
that the output file gets named correctly in the library case.

3. Normalize '-' to '_' in package names.
rustpkg: Add a few tests

There's no test runner for rustpkg yet; just sketching out a few
basic test scenarios. pass/ contains packages that should compile
successfully, whereas fail/ contains packages that should fail
to build.
rustpkg: Implement clean; replace boolean result flags with fail!()

1. Implemented the `clean` command

2. The methods implementing rustpkg commands all returned `bool`.
Since most of not all of the error situations seem unrecoverable,
I changed the methods to return unit (and also stubbed out several
more methods that were assuming a package script existed, to be
re-implemented in the future)
rustpkg: Remove bogus .rc file
rustpkg: Change this example to show how to do a custom build
rustpkg: Don't execute the standard build logic if there is a pkg.rs
rustpkg: Add a list of rustpkg commands that should pass

This is a test file containing examples of commands that should
succeed. When we write the test runner, we will have to figure
out how to automate them.
rustpkg: Add more tests

These are examples of what *should* work, and probably don't
work yet.
add dropwhile and takewhile iterators
core: Remove pipes::spawn_service, spawn_service_recv

These are only used in test cases; pipes isn't the right place for them;
they are unnecessary.

Conflicts:
	src/libcore/rt/uv/mod.rs
core: Just reordering some code
core: Remove #[doc(hidden)] attributes and atomic wrapper functions from pipes

Neither are needed
core: Inline the protocol definitions of sendp and oneshot

I want to be able to see what is going on
core: Remove a stray #[doc(hidden)] attribute