IOSpec: A pure specification of the IO monad.

[ bsd3, library, testing ] [ Propose Tags ]

This package consists of several modules, that give a pure specification of functions in the IO monad:

Besides these modules containing the specifications, there are a few other important modules:

There are several well-documented examples included with the source distribution.

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Versions 0.1, 0.1.1, 0.2, 0.2.1, 0.2.2, 0.2.3, 0.2.4, 0.2.5, 0.2.6, 0.3
Dependencies base (>=2 && <5), mtl, QuickCheck (==2.*), Stream [details]
License BSD-3-Clause
Author Wouter Swierstra, Yusaku Hashimoto
Maintainer Wouter Swierstra <>
Category Testing
Uploaded by WouterSwierstra at Mon Feb 20 14:46:19 UTC 2012
Distributions Debian:0.3, Fedora:0.3, NixOS:0.3
Downloads 6378 total (29 in the last 30 days)
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Status Docs not available [build log]
All reported builds failed as of 2016-12-25 [all 8 reports]
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  • Test
    • Test.IOSpec
      • Test.IOSpec.Fork
      • Test.IOSpec.IORef
      • Test.IOSpec.MVar
      • Test.IOSpec.STM
      • Test.IOSpec.Surrogate
      • Test.IOSpec.Teletype
      • Test.IOSpec.Types
      • Test.IOSpec.VirtualMachine


Maintainer's Corner

For package maintainers and hackage trustees

Readme for IOSpec-0.2.4

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IOSpec version 0.2
  Author: Wouter Swierstra <>

IOSpec provides a library containing pure, executable specifications
of a few functions from the IO monad. 

Build instructions:

    $ runhaskell Setup.lhs configure
    $ runhaskell Setup.lhs build
    $ runhaskell Setup.lhs install

for more instructions.


Please have a look at the latest documentation available from:

To build the Haddock API execute the following command:
    $ runhaskell Setup.lhs haddock

This will require Haddock 2.0

Check out the examples directory for the following examples:

    * Echo.hs - illustrates how to test the echo function.
    * Queues.hs - an implementation of queues using IORefs.
    * Channels.hs - an implementation of channels using MVars.
    * Sudoku.hs - a parallel Sudoku solver that uses STM and MVars
         based on Graham Hutton's version of Richard Bird's "Solving Sudoku".

Every example contains quite some comments, explaining how to use
the library.