1 error[E0596]: cannot borrow `f` as mutable, as it is not declared as mutable
2 --> $DIR/issue-84044-drop-non-mut.rs:5:10
5 | - help: consider changing this to be mutable: `mut f`
7 | ^^^^^^ cannot borrow as mutable
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0596`.