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docs: clarify comment in owned_mutation test (fix #2303) #2308

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docs: clarify comment in owned_mutation test (fix #2303) #2308

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6 changes: 3 additions & 3 deletions exercises/19_smart_pointers/cow1.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -57,9 +57,9 @@ mod tests {

#[test]
fn owned_mutation() {
// Of course this is also the case if a mutation does occur (not all
// numbers are absolute). In this case, the call to `to_mut()` in the
// `abs_all` function returns a reference to the same data as before.
// When the data is already owned, even if a mutation occurs, `to_mut()`
// simply returns a mutable reference to the existing owned data without
// performing any clone.
let vec = vec![-1, 0, 1];
let mut input = Cow::from(vec);
abs_all(&mut input);
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