Generic representation and manipulation of abstract syntax

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BSD3 licensed by Emil Axelsson
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The library provides a generic representation of type-indexed abstract syntax trees (or indexed data types in general). It also permits the definition of open syntax trees based on the technique in Data Types à la Carte [1].

(Note that the difference between version 2.x and 3.0 is not that big. The bump to 3.0 was done because the modules changed namespace.)

For more information, see "A Generic Abstract Syntax Model for Embedded Languages" (ICFP 2012):

Example EDSLs can be found in the examples folder.

W. Swierstra. Data Types à la Carte. Journal of Functional Programming, 18(4):423-436, 2008,

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