[Haskell-cafe] Parsec memory behavior

Greg Fitzgerald garious at gmail.com
Wed May 17 17:10:53 EDT 2006

> big memory leak ... two parsers in sequence

A related question, are these two equivalents?

foldl2 f g y z lst = (foldl f y lst, foldl g z lst)
foldl2' f g y z lst = foldl (\(i, j) x -> (f i x, g j x)) (y, z) lst

If no, is there some strictness that can be added to make them equivalent?  And
if so, could a compiler make this optimization as to avoid these sorts of
space leaks?

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