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error[E0596]: cannot borrow `*buf` as mutable, as it is behind a `&` reference
  --> $DIR/issue-40823.rs:3:5
   |
LL |     buf.iter_mut();
   |     ^^^ `buf` is a `&` reference, so the data it refers to cannot be borrowed as mutable
   |
help: consider changing this to be a mutable reference
   |
LL |     let mut buf = &mut [1, 2, 3, 4];
   |                    +++

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0596`.