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Auto merge of #18494 - frewsxcv:frewsxcv-size-hint, r=jdm

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Implement `size_hint` for more iterators.

```
implement size hint for
more iterators because why
not we like fast things
```

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bors-servo 2017-09-13 19:38:32 -05:00 • committed by GitHub
commit bb2030a493
8 changed files with 36 additions and 0 deletions
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4
components/style/properties/declaration_block.rs
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@ -99,6 +99,10 @@ impl<'a> Iterator for DeclarationImportanceIterator<'a> {
self.iter.next().map(|(decl, important)|
(decl, if important { Importance::Important } else { Importance::Normal }))
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
}
impl<'a> DoubleEndedIterator for DeclarationImportanceIterator<'a> {