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Using cargo clippy with -Z build-std produces warnings inside of libcore #4563

@alex

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@alex

If you attempt to use cargo clippy with the new cargo support for building the standard libraries (obsoleting cargo-xbuild and xargo), clippy will emit tons of warnings inside of libcore.

Usage: cargo clippy -Z build-std=core,alloc --target=<anything>

You can see an example of this failing here: https://travis-ci.com/fishinabarrel/linux-kernel-module-rust/builds/128613174

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