9 May
2008
9 May
'08
2:49 p.m.
As I understand it Haskell does not specify an order of evaluation and it would therefore be a mistake to write a program which relies on a particular evaluation order. This is the 'unsafe' aspect of unsafePerformIO.
Hmm... IMHO unsafePerformIO is 'unsafe' because it can lead to type errors in runtime. At least, that seems to be much more dangerous.