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Extend assert_is_empty for HashSet - #17960
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Lintcheck changes for d95a870
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Fixes #17937.
This will emit
assert_eq!(hashset, hashset::default())forassert!(hashset.is_empty())if hashset implements theDefaulttrait. The::default()suggestion is preferred over::new()because it also works for custom hashers that implement Default.Tests for nested references and custom hashers are also added.
changelog: [
assert_is_empty]: Extendassert_is_emptytoHashSet