optics-core-0.4.1.1: Optics as an abstract interface: core definitions
Safe HaskellSafe-Inferred
LanguageHaskell2010

Optics.Core.Extras

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Documentation

is :: Is k An_AffineFold => Optic' k is s a -> s -> Bool Source #

Check to see if this AffineFold matches.

>>> is _Just Nothing
False

Since: 0.4.1