Explicitly write down 0.1 release date in RELEASES.txt, to confirm Rust's birthday.
Index cross-mod type definition and implementation properly in rustdoc

A structure's definition and implementation may be cross-module. If the
implementing module is parsed before defining module, the fully
qualified name of the structure won't be present for the implementation
to use when being indexed. So caches such 'orphan' implementation and
indexes it at the end of crate parsing.

Closes #10284.
auto merge of #12752 : edwardw/rust/rdoc, r=alexcrichton

A structure's definition and implementation may be cross-module. If the
implementing module is parsed before defining module, the fully
qualified name of the structure won't be present for the implementation
to use when being indexed. So caches such 'orphan' implementation and
indexes it at the end of crate parsing.

Closes #10284.
auto merge of #12748 : liigo/rust/rust-birthday, r=brson

Rust v0.1 was released on January 20, 2012:
https://mail.mozilla.org/pipermail/rust-dev/2012-January/001256.html
create a sensible comparison trait hierarchy

* `Ord` inherits from `Eq`
* `TotalOrd` inherits from `TotalEq`
* `TotalOrd` inherits from `Ord`
* `TotalEq` inherits from `Eq`

This is a partial implementation of #12517.
auto merge of #12520 : thestinger/rust/cmp, r=brson

* `Ord` inherits from `Eq`
* `TotalOrd` inherits from `TotalEq`
* `TotalOrd` inherits from `Ord`
* `TotalEq` inherits from `Eq`

This is a partial implementation of #12517.
Removed DeepClone. Issue #12698.