rust-lang/rust — pull request #17428 by fhahn (2014-09-21 21:38:00+00:00)
Title: Rename begin_unwind lang item and core function

This is a PR for #16114 and includes to following things:

* Rename `begin_unwind` lang item to `fail_fmt`
* Rename `core::failure::begin_unwind` to `fail_impl`
* Rename `fail_` lang item to `fail`