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The alias checker works by ensuring that any value to which an alias is created is rooted in some way that ensures it outlives the alias. It is now disallowed to create an alias to the content of a mutable box, or to a box hanging off a mutable field. There is also machinery in place to prevent assignment to local variables whenever they are the root of a live alias.
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://github.com/graydon/rust for current development page.