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$ cargo run
Compiling collections v0.1.0 (file:///projects/collections)
error[E0502]: cannot borrow `v` as mutable because it is also borrowed as immutable
--> src/main.rs:6:5
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4 | let first = &v[0];
| - immutable borrow occurs here
5 |
6 | v.push(6);
| ^^^^^^^^^ mutable borrow occurs here
7 |
8 | println!("The first element is: {}", first);
| ----- immutable borrow later used here
For more information about this error, try `rustc --explain E0502`.
error: could not compile `collections` due to previous error
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