The trivial-constraint package

[Tags: gpl, library]

Since GHC 7.4, constraints are first-class: we have the constraint kind, and thus type-classes have a kind such as * -> Constraint.

These can be used as parameters to data types. They also can be combined quite nicely,

type NewConstraint a = (Constraint1 a, Constraint2 a)

however you always need to start with a plain old type class when building constraints.

This library provides a type class that is not really a constraint at all, so you can start from zero with building up a custom constraint. Also its opposite (a constraint that no type can ever fulfill).


Dependenciesbase (>=4.5 && <5)
AuthorJustus Sagemüller
Home page
Upload dateTue Jun 3 15:43:16 UTC 2014
Uploaded byleftaroundabout
Downloads192 total (23 in last 30 days)




Maintainers' corner

For package maintainers and hackage trustees