error[E0596]: cannot borrow `*a` as mutable, as `a` is not declared as mutable | |
--> $DIR/borrowck-borrow-immut-deref-of-box-as-mut.rs:12:5 | |
| | |
LL | let a: Box<_> = box A; | |
| - help: consider changing this to be mutable: `mut a` | |
LL | a.foo(); | |
| ^ cannot borrow as mutable | |
error: aborting due to previous error | |
For more information about this error, try `rustc --explain E0596`. |