Uninhabited enum cast#6204

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pcwalton wants to merge 3 commits intorust-lang:incomingfrom

pcwalton:uninhabited-enum-cast

Commits on May 2, 2013

libstd: De-mut arena
pcwalton
committed

Commits on May 3, 2013

librustc: Update the serializer to work properly with INHTWAMA, removing mutable fields in the process
pcwalton
committed
librustc: Make uninhabited enums not castable to int
pcwalton
committed