Dictionary
Words, grammatical forms and meanings linked to the ontology.
phantom type en · NOUN
Meanings
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A parameterized type that does not depend on all of its type parameters.
2004 July 31, Markus Mottl, "Phantom types" on caml-listhttps://web.archive.org/web/20200622172054/https://caml.inria.fr/pub/ml-archives/caml-list/2004/07/3a19a05047ea9332426bba1d8bc403ce.en.html
Phantom types not only allow you to capture constraints, which are proved by the compiler, they are also perfectly cheap computationally, because you don't have to check things at runtime all the time.
Forms