From: haberg@math.su.se   
      
   In article <07-10-094@comp.compilers>, torbenm@tyr.diku.dk (Torben   
   =?iso-8859-1?Q?=C6gidius?= Mogensen) wrote:   
      
   > > It's interesting you mention that call-by-need (CBN) parameter passing   
   > > semantics is not particularly popular today.   
   >   
   > It is relatively common in functional languages, such as Haskell.   
      
   Schmidt, "Denotational Semantics", p. 181, distinguishes between   
   "call-by-need", which requires that once the evaluation of an argument   
   does proceed the whole expression must be evaluated, and "lazy   
   evaluation", which only evaluates as much as is needed from the   
   argument (a suitable subpart). By this terminology, Haskell uses lazy   
   evaluation, not call-by-need.   
      
     Hans Aberg   
      
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