and more

warning: this argument is a mutable reference, but not used mutably
    --> compiler\rustc_mir_transform\src\coroutine.rs:1229:11
     |
1229 |     body: &mut Body<'tcx>,
     |           ^^^^^^^^^^^^^^^ help: consider changing to: `&Body<'tcx>`
     |
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut

warning: this argument is a mutable reference, but not used mutably
   --> compiler\rustc_mir_transform\src\nrvo.rs:123:11
    |
123 |     body: &mut mir::Body<'_>,
    |           ^^^^^^^^^^^^^^^^^^ help: consider changing to: `&mir::Body<'_>`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut

warning: this argument is a mutable reference, but not used mutably
  --> compiler\rustc_mir_transform\src\nrvo.rs:87:34
   |
87 | fn local_eligible_for_nrvo(body: &mut mir::Body<'_>) -> Option<Local> {
   |                                  ^^^^^^^^^^^^^^^^^^ help: consider changing to: `&mir::Body<'_>`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut

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