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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
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LL | let a: Box<_> = Box::new(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`.
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