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Exercise 27
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fn main() {
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let vec0 = vec![22, 44, 66];
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let mut vec1 = fill_vec(vec0);
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let vec1 = fill_vec(vec0.clone());
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assert_eq!(vec1, vec![22, 44, 66, 88]);
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}
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fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
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fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
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vec.push(88);
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vec
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