OS-specific functionality.
std for Darwin / Apple platforms.target_os=trusty or WASI or target_os=motorcore::ffi instead.std for Unix platforms.std for the WebAssembly System Interface (WASI).target_env=p2std for Preview 2 of the WebAssembly System Interface (WASI).std for Windows.
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Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/os/index.html