error[E0594]: cannot assign to `*foo` which is behind a `&` reference
  --> $DIR/issue-51515.rs:5:5
   |
LL |     let foo = &16;
   |               --- help: consider changing this to be a mutable reference: `&mut 16`
...
LL |     *foo = 32;
   |     ^^^^^^^^^ `foo` is a `&` reference, so the data it refers to cannot be written

error[E0594]: cannot assign to `*bar` which is behind a `&` reference
  --> $DIR/issue-51515.rs:10:5
   |
LL |     let bar = foo;
   |         --- help: consider changing this to be a mutable reference: `&mut i32`
...
LL |     *bar = 64;
   |     ^^^^^^^^^ `bar` is a `&` reference, so the data it refers to cannot be written

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0594`.