Friday, February 18, 2011

Groking HOAS in F#

It is 3 AM in Budapest and, quite typically, I cannot sleep since my mind is actively engaged in remembering all the functional programming tricks I have read about. So, tonight it is HOAS, or Higher Order Abstract Syntax. If you have ever implemented a De Bruijn-indexed AST for Scheme and spent a few days catching indexing bugs, you surely would appreciate the beauty of this:

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