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52cc0d5360
Use `IsTerminal` in place of `atty` In any crate that can use nightly features, use `IsTerminal` rather than `atty`: - Use `IsTerminal` in `rustc_errors` - Use `IsTerminal` in `rustc_driver` - Use `IsTerminal` in `rustc_log` - Use `IsTerminal` in `librustdoc`