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$ cargo run
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Compiling ownership v0.1.0 (file:///projects/ownership)
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error[E0502]: cannot borrow `s` as mutable because it is also borrowed as immutable
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--> src/main.rs:6:14
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4 | let r1 = &s; // no problem
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| -- immutable borrow occurs here
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5 | let r2 = &s; // no problem
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6 | let r3 = &mut s; // BIG PROBLEM
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| ^^^^^^ mutable borrow occurs here
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7 |
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8 | println!("{}, {}, and {}", r1, r2, r3);
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| -- immutable borrow later used here
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For more information about this error, try `rustc --explain E0502`.
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error: could not compile `ownership` (bin "ownership") due to 1 previous error
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