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f768163982
This patch adds a new crate: tokio-fs. This crate provides a wrapper around `std` functionality that can only be performed using blocking operations. This primarily includes filesystem operations, but it also includes standard input, output, and error access as these streams cannot be safely switched to non-blocking mode in a portable way. These wrappers call the `std` functions from within a `blocking` annotation which allows the runtime to compensate for the fact that the thread will potentially remain blocked in a system call.