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$ cargo run
Compiling borrowing v0.1.0 (file:///projects/borrowing)
error[E0596]: cannot borrow `x` as mutable, as it is not declared as mutable
--> src/main.rs:3:13
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2 | let x = 5;
| - help: consider changing this to be mutable: `mut x`
3 | let y = &mut x;
| ^^^^^^ cannot borrow as mutable
For more information about this error, try `rustc --explain E0596`.
error: could not compile `borrowing` due to previous error
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