error: the function `last` doesn't need a mutable reference --> tremor-script/src/vm.rs:353:34 | 353 | let v = last(&mut stack, *pc, *cc)?; | ^^^^^^^^^^ | = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_mut_passed note: the lint level is defined here --> tremor-script/src/lib.rs:20:5 | 20 | clippy::all, | ^^^^^^^^^^^ = note: `#[deny(clippy::unnecessary_mut_passed)]` implied by `#[deny(clippy::all)]`