The bound package

[Tags: bsd3, library]

The goal of this package is to make it as easy as possible to deal with name binding without forcing an awkward monadic style on the user. To that end we provide haskell 98 combinators for manipulating locally-nameless generalized de Bruijn terms, build over user-supplied term types. A generalized de Bruijn term is one where you can succ whole trees instead of just individual variables.

The approach was first elaborated in Bird and Patterson, "de Bruijn notation as a nested data type":

However, the combinators they used required higher rank types. Here we use a monad transformer to encapsulate the novel recursion pattern in their generalized de Bruijn representation. It is named Scope to match up with the terminology from Conor McBride and James McKinna's "I am not a number: I am a free variable", while providing stronger type safety guarantees.

There are three worked examples in the examples folder:


Versions0.1, 0.1.1, 0.1.2, 0.1.3, 0.1.4, 0.2, 0.2.1, 0.3.1, 0.3.2, 0.4, 0.5,,, 0.5.1, 0.6, 0.6.1, 0.7, 0.8, 0.8.1, 0.9,, 0.9.1,, 1.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5, 1.0.6, 1.0.7
Change logNone available
Dependenciesbase (==4.*), bifunctors (>=0.1.3 && <0.2), prelude-extras (==0.2.*), transformers (>=0.2 && <0.4) [details]
CopyrightCopyright (C) 2012 Edward A. Kmett
AuthorEdward A. Kmett
MaintainerEdward A. Kmett <>
CategoryLanguage, Compilers/Interpreters
Home page
Bug tracker
Source repositoryhead: git clone git://
UploadedSat Jun 16 08:18:05 UTC 2012 by EdwardKmett
DistributionsLTSHaskell:1.0.7, NixOS:1.0.7, Stackage:1.0.7
Downloads7581 total (75 in last 30 days)
3 []
StatusDocs uploaded by user
Build status unknown [no reports yet]




Maintainers' corner

For package maintainers and hackage trustees