Commits on Mar 23, 2015

1. Stabilize the Error trait …

   This small commit stabilizes the `Error` trait as-is, except that `Send`
   and `Debug` are added as constraints. The `Send` constraint is because
   most uses of `Error` will be for trait objects, and by default we would
   like these objects to be transferrable between threads. The `Debug`
   constraint is to ensure that e.g. `Box<Error>` is `Debug`, and because
   types that implement `Display` should certainly implement `Debug` in any case.
   
   In the near future we expect to add `Any`-like downcasting features to
   `Error`, but this is waiting on some additional
   mechanisms (`Reflect`). It will be added before 1.0 via default methods.
   
   [breaking-change]

   

   aturon committed Mar 23, 2015
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