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Rollup merge of #71892 - integer32llc:btreemap-entry-vacant-docs, r=jonas-schievink
Update btree_map::VacantEntry::insert docs to actually call insert It looks like they were copied from the `or_insert` docs. This change makes the example more like the hash_map::VacantEntry::insert docs.
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@ -2499,15 +2499,14 @@ impl<'a, K: Ord, V> VacantEntry<'a, K, V> {
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///
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/// ```
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/// use std::collections::BTreeMap;
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/// use std::collections::btree_map::Entry;
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///
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/// let mut count: BTreeMap<&str, usize> = BTreeMap::new();
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/// let mut map: BTreeMap<&str, u32> = BTreeMap::new();
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///
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/// // count the number of occurrences of letters in the vec
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/// for x in vec!["a","b","a","c","a","b"] {
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/// *count.entry(x).or_insert(0) += 1;
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/// if let Entry::Vacant(o) = map.entry("poneyland") {
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/// o.insert(37);
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/// }
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///
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/// assert_eq!(count["a"], 3);
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/// assert_eq!(map["poneyland"], 37);
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn insert(self, value: V) -> &'a mut V {
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