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Rollup merge of #55711 - kngwyu:btreemap-rangemut-doc, r=Mark-Simulacrum

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Format BtreeMap::range_mut example

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kennytm 2018-11-13 13:03:04 +08:00
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7
src/liballoc/collections/btree/map.rs
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@ -853,9 +853,10 @@ impl<K: Ord, V> BTreeMap<K, V> {
/// ```
/// use std::collections::BTreeMap;
///
/// let mut map: BTreeMap<&str, i32> = ["Alice", "Bob", "Carol", "Cheryl"].iter()
/// .map(|&s| (s, 0))
/// .collect();
/// let mut map: BTreeMap<&str, i32> = ["Alice", "Bob", "Carol", "Cheryl"]
/// .iter()
/// .map(|&s| (s, 0))
/// .collect();
/// for (_, balance) in map.range_mut("B".."Cheryl") {
/// *balance += 100;
/// }