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Auto merge of #4954 - JohnTitor:improve-len-zero-doc, r=llogiq 

Correct documentation for `len_zero`

Fixes #4902

changelog: none
This commit is contained in:
bors 2019-12-25 16:27:18 +00:00
parent a68ef55dbf ad936389e1
commit 87e628f646
1 changed files with 3 additions and 4 deletions
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7
clippy_lints/src/len_zero.rs
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@ -15,10 +15,9 @@ declare_clippy_lint! {
/// just to compare to zero, and suggests using `.is_empty()` where applicable.
///
/// **Why is this bad?** Some structures can answer `.is_empty()` much faster
/// than calculating their length. Notably, for slices, getting the length
/// requires a subtraction whereas `.is_empty()` is just a comparison. So it is
/// good to get into the habit of using `.is_empty()`, and having it is cheap.
/// Besides, it makes the intent clearer than a manual comparison.
/// than calculating their length. So it is good to get into the habit of using
/// `.is_empty()`, and having it is cheap.
/// Besides, it makes the intent clearer than a manual comparison in some contexts.
///
/// **Known problems:** None.
///