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borrowck
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borrowck-borrow-immut-deref-of-box-as-mut.rs
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#![
feature
(
box_syntax
)]
struct
A
;
impl
A
{
fn
foo
(&
mut
self
)
{
}
}
pub
fn
main
()
{
let
a
:
Box
<
_
>
=
box A
;
a
.
foo
();
//~^ ERROR cannot borrow `*a` as mutable, as `a` is not declared as mutable [E0596]
}