Add is_empty() to RegexSet.
#687
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Implementing `is_empty()` on RegexSet makes the API similar to standard library collections like `Vec` and `BTreeSet`. The clippy lint `len_without_is_empty` recommends that items which implement `len()` should implement `is_empty()`.
BurntSushi
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Oct 11, 2020
This adheres to standard conventions for collections of things. Closes #687
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Implementing
is_empty()on RegexSet makes the API similar to standardlibrary collections like
VecandBTreeSet. The clippy lintlen_without_is_emptyrecommends that items which implementlen()should implement
is_empty().