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Comment by dkhenry | Hacker News Reader

I am no Haskell expert, so I might be wrong on this, but is that code right ? I would imagine the fourth line should read

    isIfOfInterest (CIf cond _ _ _) = not (null (listify isFooIdent cond))

not

    isIfOfInterest (CIf cond _ _ _) = not (null (listify fooIdent cond))

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You are correct. The nice thing is that this mistake would have been caught compile-time.

You mean, "identifier not found"... ?

Exactly. Ever tried running PHP, Ruby or Python code with an undefined variable somewhere? It works flawlessly... for a minute... an hour... or a month... and then it suddenly hits you out of the blue.

The bad thing is that people still write blog posts containing uncompiled code.

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