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I removed the following:

NB. do not do this if the expression on the right of $! is a variable - that just wastes effort, because it does not eliminate a suspension. The only reason to do this would be if you were eliminating a space leak.

because <pre-haskell> test = let

 x = undefined
 in (const 0) $! x

</pre-haskell> yields exception and substituting ($) for ($!) yields 0. So ($!) does eliminate a suspension. --beroal 16:58, 16 June 2010 (UTC)