turn off let floating

Bernard James POPE bjpop at cs.mu.OZ.AU
Tue Apr 6 19:24:06 EDT 2004

Hi all,

In the documentation for System.IO.Unsafe
it says:

   Make sure that the either you switch off let-floating, 
   or that the call to unsafePerformIO cannot float outside a lambda.  

My question is how can you turn off let floating? I can't seem to
find a flag that suggests this behaviour.


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