Tying the Knot

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This example illustrates different ways to define recursive data structures. To demonstrate the different techniques we show how to solve the same problem---writing an interpreter for a simple programming language---in three different ways. This is a nice example because, (i) it is interesting, (ii) the abstract syntax of the language contains mutually recursive structures, and (iii) the interpreter illustrates how to work with the recursive structures.

(It would be useful to have some more text describing the examples.)

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