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1. package explicit-exception

   Exceptions which are explicit in the type signature. Synchronous and Asynchronous exceptions which are explicit in the type signature. The first ones are very similar to Either and Control.Monad.Error.ErrorT. The second ones are used for System.IO.readFile and System.IO.hGetContents. This package is a proposal for improved exception handling in Haskell. It strictly separates between handling of exceptional situations (file not found, invalid user input, see http://wiki.haskell.org/Exception) and (programming) errors (division by zero, index out of range, see http://wiki.haskell.org/Error). Handling of the first one is called "exception handling", whereas handling of errors is better known as "debugging". For applications see the packages midi, spreadsheet, http-monad. Although I'm not happy with the identifier style of the Monad Transformer Library (partially intended for unqualified use) I have tried to adopt it for this library, in order to let Haskell programmers get accustomed easily to it. See also: unexceptionalio

2. package generics-sop

   Generic Programming using True Sums of Products A library to support the definition of generic functions. Datatypes are viewed in a uniform, structured way: the choice between constructors is represented using an n-ary sum, and the arguments of each constructor are represented using an n-ary product. The module Generics.SOP is the main module of this library and contains more detailed documentation. Since version 0.4.0.0, this package is now based on sop-core. The core package contains all the functionality of n-ary sums and products, whereas this package provides the datatype-generic programming support on top. Examples of using this library are provided by the following packages:

   • basic-sop basic examples,
   • pretty-sop generic pretty printing,
   • lens-sop generically computed lenses,
   • json-sop generic JSON conversions.
   A detailed description of the ideas behind this library is provided by the paper:
   • Edsko de Vries and Andres Löh. True Sums of Products. Workshop on Generic Programming (WGP) 2014.

3. package genvalidity-criterion

   Criterion benchmarks for generators Criterion benchmarks for generators

4. package hlint

   Source code suggestions HLint gives suggestions on how to improve your source code.

5. package kan-extensions

   Kan extensions, Kan lifts, the Yoneda lemma, and (co)density (co)monads Kan extensions, Kan lifts, various forms of the Yoneda lemma, and (co)density (co)monads.

6. package markdown-unlit

   Literate Haskell support for Markdown Documentation is here: https://github.com/sol/markdown-unlit#readme

7. package monad-loops

   Monadic loops Some useful control operators for looping. New in 0.4: STM loop operators have been split into a new package instead of being conditionally-built. New in 0.3.2.0: various functions for traversing lists and computing minima/maxima using arbitrary procedures to compare or score the elements.

8. package persistent-sqlite

   Backend for the persistent library using sqlite3. This package includes a thin sqlite3 wrapper based on the direct-sqlite package, as well as the entire C library, so there are no system dependencies.

9. package prettyprinter-ansi-terminal

   ANSI terminal backend for the »prettyprinter« package. See README.md

10. package rio

    A standard library for Haskell See README and Haddocks at https://www.stackage.org/package/rio

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