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  1. Proceedings of the 2012 Haskell Symposium (Haskell '12)
  2. Shrinking and showing functions: (functional pearl)
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The HERMIT in the machine: a plugin for the interactive transformation of GHC core language programs
Guiding parallel array fusion with indexed types
Testing type class laws
Surveyor: a DSEL for representing and analyzing strongly typed surveys
Dependently typed programming with singletons
Layout-sensitive language extensibility with SugarHaskell
Template your boilerplate: using template haskell for efficient generic programming
Vectorisation avoidance
Feat: functional enumeration of algebraic types
Wormholes: introducing effects to FRP
xmonad in Coq (experience report): programming a window manager in a proof assistant
Shrinking and showing functions: (functional pearl)
Monoids: theme and variations (functional pearl)
Safe haskell

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Shrinking and showing functions: (functional pearl)

Content Provider ACM Digital Library
Author Claessen, Koen
Abstract Although quantification over functions in QuickCheck properties has been supported from the beginning, displaying and shrinking them as counter examples has not. The reason is that in general, functions are infinite objects, which means that there is no sensible show function for them, and shrinking an infinite object within a finite number of steps seems impossible. This paper presents a general technique with which functions as counter examples can be shrunk to finite objects, which can then be displayed to the user. The approach turns out to be practically usable, which is shown by a number of examples. The two main limitations are that higher-order functions cannot be dealt with, and it is hard to deal with terms that contain functions as subterms.
Starting Page 73
Ending Page 80
Page Count 8
File Format PDF
ISBN 9781450315746
DOI 10.1145/2364506.2364516
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2012-09-13
Publisher Place New York
Access Restriction Subscribed
Subject Keyword Quickcheck Counter example Testing
Content Type Text
Resource Type Article
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