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STDIN

std::os::fd

Constant STDIN 

Source 
pub const STDIN: BorrowedFd<'static>;
🔬This is a nightly-only experimental API. (stdio_fd_consts #150836)
Available on Hermit or Motor OS or Trusty or Unix or WASI only.
Expand description

The file descriptor for the standard input stream of the current process.

See io::stdin() for the higher level handle, which should be preferred whenever possible. See STDERR for why the file descriptor might be required and caveats.