Haskell interpreters

[Phaedon Sinis]

Hi all,

This is an incredible tutorial if you're interested in DSLs, or even if you're still struggling to make the mental shift from data to functions as you start your projects. My advice is to ignore the (rather intimidating) title and at least work through at least the first couple of tutorial files (ExtF.hs is particularly awesome).

http://okmij.org/ftp/tagless-final/course/course.html

My question: are there any risks to using the TypeSynonymInstances pragma? I see how it makes the examples really simple, and avoids the need to wrap everything in a data constructor.

best,

Phaedon

[Bryan O'Sullivan]

That extension is completely safe to use.