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Fixes all current clippy warnings1 so CI is green again.
Fixing the warning
clippy::needless_pass_by_ref_mut
became a little involved. The internal version of clippy isn't recent enough to have this warning and so just doing#[allow(clippy::needless_pass_by_ref_mut)]
leads to another error. The resulting change fixes the clippy warning and gets rid of some of the shenanigans I was doing to avoid allocating path buffers within the child process.