phantom_types
Examples of phantom types using Ocaml
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estring - My own attempt at Martin Jambon's example of phantom types at http://www.quora.com/Martin-Jambon/answers/Functional-Programming - Phantom types aren't actually that great here because you have to define all encodig types together, you can't extend it later on.
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rstring - Phantom types are really good for making read-only versions of mutable structures. This one provides a read-only string interface
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rarray - Read only array - left as exercise to reader