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### What it does
Checks for items that implement `.len()` but not
`.is_empty()`.
### Why is this bad?
It is good custom to have both methods, because for
some data structures, asking about the length will be a costly operation,
whereas `.is_empty()` can usually answer in constant time. Also it used to
lead to false positives on the [`len_zero`](#len_zero) lint – currently that
lint will ignore such entities.
### Example
```
impl X {
pub fn len(&self) -> usize {
..
}
}
```
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