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Rollup merge of #44609 - jonhoo:hash-alloc, r=steveklabnik
Mention that HashMap::new and HashSet::new do not allocate The docs for `HashMap::with_capacity` and `HashSet::with_capacity` already say that > If `capacity` is 0, the hash map/set will not allocate. However, the docs for `::new` do not say that the initial capacity is 0, and thus promise that a call to `::new` alone does not allocate. This PR fixes that.
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