libcore: Implement an `Equiv` trait and use it on hashmaps.#5234

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pcwalton wants to merge 3 commits intorust-lang:incomingfrom

Commits on Mar 5, 2013

libsyntax: Separate multiple inherited traits with `+`
pcwalton
committed
librustc: Fix silly bug in AST conversion for const vstores. rs=bugfix
pcwalton
committed
libcore: Implement an `Equiv` trait and use it on hashmaps.
pcwalton
committed