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Avoid ref when using format! in compiler
Clean up a few minor refs in `format!` macro, as it has a performance cost. Apparently the compiler is unable to inline `format!("{}", &variable)`, and does a run-time double-reference instead (format macro already does one level referencing). Inlining format args prevents accidental `&` misuse.
See also https://github.com/rust-lang/rust-clippy/issues/10851
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.