72360970fc
And replace trans::common::block_parent with option<block>. To handle the recursive self-reference in the block_ class, I had to add a newtype-like enum "block" which is equivalent to @block_ -- which due to an interaction with borrowck, resulted in having to change a few functions in trans::base to take their block argument in ++ mode, irritatingly enough (but not that irritatingly, since we're supposed to get rid of modes).
This is a compiler and suite of associated libraries and documentation for the Rust programming language. See LICENSE.txt for terms of copyright and redistribution. See http://www.rust-lang.org for more information.