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GHC 9.10.3 · lts/ghc-9.10.x · 248f8f0 · 2026-10-05

ModuleAgda-2.7.0.1Haskell2010

Agda.Utils.Empty

An empty type with some useful instances.

  • 1 type
  • 2 values
  • PackageAgda-2.7.0.1
  • Exports3
  • LanguageHaskell2010
  • LicenceMIT
  • SourceEmpty.hs
datadata Empty
#
Instances4Eq, Ord, Show, NFData
  • Eq EmptyDefined in Agda-2.7.0.1 · Agda.Utils.Empty
  • Ord EmptyDefined in Agda-2.7.0.1 · Agda.Utils.Empty
  • Show EmptyDefined in Agda-2.7.0.1 · Agda.Utils.Empty
  • NFData EmptyDefined in Agda-2.7.0.1 · Agda.Utils.Empty

    Values of type Empty are not forced, because Empty is used as a constructor argument in Substitution'.

valuetoImpossible :: Empty -> IO Impossible
#

toImpossible e extracts the Impossible value raised via IMPOSSIBLE to create the element e of type Empty. It proceeds by evaluating e to weak head normal form and catching the exception. We are forced to wrap things in a Maybe because of catchImpossible's type.