1 error[E0502]: cannot borrow `*a` as mutable because `a` is also borrowed as immutable
5 | ----- immutable borrow occurs here
6 LL | bar(a); //~ ERROR E0502
7 | ^ mutable borrow occurs here
9 | - immutable borrow ends here
11 error: aborting due to previous error
13 For more information about this error, try `rustc --explain E0502`.