77c1b9650f
Some of the vec utilities now only work on immutable vecs, since they would have to be rewritten to do a lot more copying to be alias-safe. Some forced copying was added to map.rs, showing a weakness in the alias checker (or maybe the alias system): when fn args are passed into a function, calling them must assume all aliases that are not immutably rooted (directly connected to a local or temporary without any mutable edges) become invalid. This will be a drag on functional programming in Rust. Work around alias issues in the stdlib
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