ghc-vis: Live visualization of data structures in GHCi

[ bsd3, debug, development, ghc, library ] [ Propose Tags ]
Versions 0.1, 0.2, 0.2.1, 0.3, 0.3.1,, 0.3.2, 0.4, 0.5, 0.6, 0.6.1,, 0.7,, 0.7.1, 0.7.2,,,,,,,,,, 0.8, 0.9
Dependencies base (==4.*), cairo (==0.12.*), deepseq, fgl, ghc‑heap‑view (>=, graphviz (>=2999.14.1.0), gtk (==0.12.*), mtl (>=2.0), text, transformers, xdot (>=0.2) [details]
License BSD-3-Clause
Copyright Dennis Felsing 2012
Author Dennis Felsing <>
Maintainer Dennis Felsing <>
Category GHC, Debug, Development
Home page
Uploaded by DennisFelsing at Sat Oct 20 13:26:46 UTC 2012
Distributions NixOS:0.9
Downloads 9019 total (85 in the last 30 days)
Rating 2.0 (votes: 1) [estimated by rule of succession]
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Status Docs not available [build log]
All reported builds failed as of 2016-12-23 [all 8 reports]
Hackage Matrix CI

Visualize live data structures in GHCi. Evaluation is not forced and you can interact with the visualized data structures. This allows seeing Haskell's lazy evaluation and sharing in action.

See for the basic usage of ghc-vis or watch a short video demonstrating how it can be used with GHCi's debugger:


  • GHC
    • GHC.Vis



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