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error[E0499]: cannot borrow `xs` as mutable more than once at a time
--> $DIR/vec-mut-iter-borrow.rs:15:9
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LL | for x in &mut xs {
| -------
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| first mutable borrow occurs here
| first borrow used here, in later iteration of loop
LL | xs.push(1) //~ ERROR cannot borrow `xs`
| ^^ second mutable borrow occurs here
error: aborting due to previous error
For more information about this error, try `rustc --explain E0499`.
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