BSD3 licensed by Ryan Scott
Maintained by Ryan Scott

Module documentation for 3.6.5

There are no documented modules for this package.


Hackage Hackage Dependencies Haskell Programming Language BSD3 License Linux build Windows build

text-show-instances is a supplemental library to text-show that provides additional Show instances for data types in common Haskell libraries and GHC dependencies that are not encompassed by text-show. Currently, text-show-instances covers these libraries:

One can use these instances by importing TextShow.Instances. Alternatively, there are monomorphic versions of the showb function available in the other submodules of TextShow.


3.7 [2018.10.07]

  • Remove hoopl dependency. Instances are no longer provided for data types in the hoopl library.
  • Depend on QuickCheck-2.12 or later.
  • Depend on quickcheck-instances-0.3.19 or later.

3.6.5 [2018.07.03]

  • Fix the tests on GHC 8.6.

3.6.4 [2018.04.07]

  • Use base-compat-batteries.

3.6.3 [2018.03.15]

  • GHC 8.4 fixes

3.6.2 [2017.06.18]

  • Require QuickCheck-2.10/quickcheck-instances-0.13.6 or later

3.6.1 [2017.06.04]

  • Drop support for GHC 7.0 and 7.2
  • Allow building with quickcheck-instances-0.3.14

3.6 [2017.04.22]

  • New TextShow instances:
    • directory: XdgDirectory (from System.Directory)
    • ghc-boot-th: ForeignSrcLang (from GHC.ForeignSrcLang.Type)
    • time: UniversalTime (from Data.Time.Clock) and SystemTime (from Data.Time.Clock.System with time-1.8 or later)
    • Win32: Lots of datatypes added in Win32-
  • Remove most monomorphic TextShow functions, as their utility is questionable, and their maintenance burden is undeniable
  • Made the instances in TextShow.Data.Bifunctor poly-kinded when possible
  • Fix testsuite compilation on older GHCs

3.5 [2017.01.07]

  • Add TextShow(1) instances for Data.Graph.SCC
  • TextShow.Instances no longer reexports the entirety of TextShow. Doing so meant that text-show-instances would be burdened with bumping its major version number every time that text-show made an API change in TextShow in order to follow the PVP.
  • Remove TextShow.GHC.PackageDb module
  • Refactor test suite


  • Require text-show-3.4 or later
  • Update testsuite to be buildable with text-show-3.4


  • Add the TextShow.GHC.LanguageExtensions.Type and TextShow.GHC.PackageDb modules, which define instances if using ghc-boot
  • Add TextShow instances for NameFlavour, NameSpace, PatSynArgs, and PatSynDir in TextShow.Language.Haskell.TH
  • Require text-show-3.3 or later, which has slightly different TH derivation behavior. As a result, the context for the TextShow1 instance for Clown in TextShow.Data.Bifunctor had to be changed slightly.
  • Allow building with QuickCheck-2.9
  • Fix GHC HEAD build


  • Fix build with GHC 8.0
  • Add TextShow instance for Overlap in TextShow.Language.Haskell.TH


  • Allow build with text-show-3.2


  • Require quickcheck-instances >= 0.3.12 in test suite due to presence of new orphan Arbitrary instances for vector datatypes


  • GHC 8.0 support
  • Rename functions that previously ended with the suffix -With to instead have the prefix lift-, consistent with text-show-3
  • Removed the TextShow.Data.Semigroup and TextShow.Data.List.NonEmpty modules, as they have been moved to text-show-3 (as part of moving Semigroup into base)
  • Removed the functions for Compose, Product, and Sum in TextShow.Data.Functor.Trans, as they have been moved to text-show-3 (as part of moving them to base)
  • Add TextShow/TextShow1 instances for Fix and Sum in TextShow.Data.Bifunctor
  • Add TextShow/TextShow1 instances for the datatypes in Text.PrettyPrint.Annotated (introduced in @pretty-
  • Add TextShow instances for the new datatypes in @template-haskell-


  • Reexport the TextShow classes and module from TextShow.Instances. This helps Haddock readers discover what new instances are added with text-show-instances.
  • Make Tagged instances poly-kinded


  • Allow building with vector-0.11 and above. Be aware that the Show instances for Vector types in vector-0.11.0 are different from other versions of vector.


  • Changed the top-level module name from Text.Show.Text to TextShow, since the former was extremely verbose without much benefit. As a result, this will break all existing code that depends on text-show-instances.


  • Allow building with text-show-1. Also changed the monomorphic functions to match the naming conventions introduced in text-show-1.
  • Added instances for the bifunctors library
  • Removed utf8-string instance, since it wasn’t as useful as I had imagined
  • Revamped test suite


  • Allow building with text-show-0.8
  • Modules which were previously exported only if using a recent-enough version of GHC/base (e.g., Text.Show.Text.System.Win32) are now always exposed. If the functionality that the module provides is not available on a given version of GHC/base, the module will not expose anything.
  • Change test-suite to use hspec, allowing for it to be built on GHC 7.0 and 7.2

  • Fixed tests on Windows


  • Added showbArgPrec (and corresponding Show and Show1 instances) to Text.Show.Text.Data.Semigroup
  • Added Show1 instances for data types in Text.Show.Text.Data.List.NonEmpty and Text.Show.Text.Data.Semigroup
  • Added showbDoc (and corresponding Show instance) to Text.Show.Text.Language.Haskell.TH
  • Renamed showbDoc in Text.Show.Text.Text.PrettyPrint to renderB


  • Exposed showbKindPrec and showbPredPrec with later versions of Template Haskell
  • Added renderStyleB to Text.Show.Text.Text.PrettyPrint (for time-1.5 and later)
  • Added showbTimeLocalePrec to Text.Show.Text.Data.Time
  • Added instances for the binary, haskeline, hoopl, terminfo, and utf8-string libraries
  • Removed transformers-four flag


  • Initial commit
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