On Friday 18 November 2011, 11:18:33, Yves Parès wrote: > Instead of rewriting modifySTRef, why not just do : > > modifySTRef counter (\x -> let y = x+1 in y `seq` y) > > Is there a problem with that?
Yes, y `seq` y is precisely the same as y. a `seq` b means whenever evaluation of b is demanded, also evaluate a (to WHNF). So y `seq` y ~> whenever evaluation of y is demanded, also evaluate y. _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
