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由 Aaron Turon 提交于
Per [RFC 579](https://github.com/rust-lang/rfcs/pull/579), this commit adds a new `std::process` module. This module is largely based on the existing `std::old_io::process` module, but refactors the API to use `OsStr` and other new standards set out by IO reform. The existing module is not yet deprecated, to allow for the new API to get a bit of testing before a mass migration to it.
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