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4ffb1a7f3d
Remove unused args from functions `#[instrument]` suppresses the unused arguments from a function, *and* suppresses unused methods too! This PR removes things which are only used via `#[instrument]` calls, and fixes some other errors (privacy?) that I will comment inline. It's possible that some of these arguments were being passed in for the purposes of being instrumented, but I am unconvinced by most of them.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.