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fn main() {
let foo = &mut 1;
let &mut x = foo;
x += 1; //~ ERROR cannot assign twice to immutable variable `x`
// explicitly mut-ify internals
let &mut mut x = foo;
x += 1;
// check borrowing is detected successfully
let &mut ref x = foo;
*foo += 1; //~ ERROR cannot assign to `*foo` because it is borrowed
drop(x);
}
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