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https://github.com/rust-lang/rustlings
synced 2024-11-05 00:00:12 +00:00
47 lines
865 B
Rust
47 lines
865 B
Rust
// move_semantics3.rs
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// Make me compile without adding new lines-- just changing existing lines!
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// (no lines with multiple semicolons necessary!)
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// Scroll down for hints :)
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fn main() {
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let vec0 = Vec::new();
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let mut vec1 = fill_vec(vec0);
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println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
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vec1.push(88);
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println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
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}
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fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
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vec.push(22);
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vec.push(44);
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vec.push(66);
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vec
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}
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// The difference between this one and the previous ones is that the first line
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// of `fn fill_vec` that had `let mut vec = vec;` is no longer there. You can,
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// instead of adding that line back, add `mut` in one place that will change
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// an existing binding to be a mutable binding instead of an immutable one :)
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