New list/foldable matching functions: isSingleton and followedBy #10
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isSingleton matches a list or other Foldable instance that contains only a single item
followedBy matches a list or Foldable by matching the head to one matcher and the tail to another
These changes rely on the Foldable changes from pull request #9 , so presumably are also going to break your CI build for the same reason. If you prefer them without the Foldable changes it should be trivial to change them to work only on lists.