BSD-3-Clause licensed by Athan Clark
Maintained by

Module documentation for 0.2.0


A predicative trie library - use predicates instead of literal match to capture classes of results, instead of enumerating distinguished ones.


The predicates are existentially quantified such that a predicate creates an unknown type, while it’s result must have the necessary arity, matching the quantified type, to fulfill the lookup:

PredTrie s a
  = PNil
  | forall t. PCons
      { predicate :: s -> Maybe t
      , result    :: t -> a


I broke the lookup phases into “steps”, like the tries package, and used the fastest-lookup HashMapStep trie implementation for the literal lookups. For more info, read the code :D

How to run tests

stack test


stack bench --benchmark-arguments="--output profile.html"
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