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huonw/gist:732cccfc9b2f49ca20e1

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Last active August 29, 2015 14:12
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gistfile1.txt
* The `Copy` trait is no longer implemented automatically. Unsafe pointers no longer implement `Sync`
and `Send` so types containing them don't automatically either. `Sync` and `Send` are now 'unsafe
traits' so one can "forcibly" implement them via `unsafe impl` if a type confirms to the requirements for them even though the internals do not (e.g. structs containing unsafe pointers like `Arc`). These changes are intended to prevent some footguns
and are collectively known as [opt-in built-in traits][oibit]
(though `Sync` and `Share` will soon become pure library types
unknown to the compiler).
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