1 error[E0308]: mismatched types
2 --> $DIR/coerce-mut.rs:5:7
5 | - ^^ types differ in mutability
7 | arguments to this function are incorrect
9 = note: expected mutable reference `&mut i32`
10 found reference `&{integer}`
11 note: function defined here
12 --> $DIR/coerce-mut.rs:1:4
14 LL | fn f(x: &mut i32) {}
17 error: aborting due to previous error
19 For more information about this error, try `rustc --explain E0308`.