On Tue, Apr 14, 2009 at 5:42 PM, Luke Palmer
... However, the way I see it is that unsafePerformIO *is* evil by itself, and it is only by the addition of Holy Water that it is benign to use.
That's what I meant but your words are indeed more effective :)
Ryan Ingram described it as a way to achieve "RTS extensions", which I think is a fine way to put it I consider Debug.Trace to be an instance of this: we are extending the RTS to provide execution traces. I guess it's a teaching style thing. Mostly, if someone sees "I have an IO [XmlTree] and I need an [XmlTree]", I want the "I'm asking the wrong question" synapse path to fire, rather than the "just use unsafePerformIO" one.
Yes, I think your analysis is correct. Perhaps I was a bit too dry in my original answer. Cristiano