HORIZON HASKELLDocslts/ghc-9.14.xb2f3bfd2026-10-11Search names, modules, packages, or :: a typeCtrl K

GHC 9.14.1 · lts/ghc-9.14.x · b2f3bfd · 2026-10-11

Modulelens-5.3.6Haskell2010

Control.Lens.Extras

A few extra names that didn't make it into Control.Lens.

  • 1 value
  • Packagelens-5.3.6
  • Exports1
  • LanguageHaskell2010
  • LicenceBSD-2-Clause
  • SourceExtras.hs
valueis :: APrism s t a b -> s -> Bool
#

Check to see if this Prism matches.

Example1 expression
is _Left (Right 12)False
Example1 expression
is hex "3f79"True

module Data.Data.Lens