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由 Alex Crichton 提交于
This commit performs a second pass over the `std::boxed` module, taking the following actions: * `boxed` is now stable * `Box` is now stable * `BoxAny` is removed in favor of a direct `impl Box<Any>` * `Box::downcast` remains unstable while the name of the `downcast` family of methods is determined. This is a breaking change due to the removal of the `BoxAny` trait (note that the `downcast` method still exists), and existing consumers of `BoxAny` simply need to remove the import in their modules. [breaking-change]
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