[Haskell-cafe] Re: List comprehension desugaring

Hi Sorry for the noise, I've now realised they are a left to right rewrite system, the second rule is required to set up the base case. Thanks Neil On 8/19/07, Neil Mitchell <ndmitchell@gmail.com> wrote:

Hi,

The Haskell desugaring for list comprehensions is given in:

http://haskell.org/onlinereport/exps.html#list-comprehensions

All the rules seem to be left to right rewrites, apart from the second one, which seems to be right to left. Is there some deep reason for this, or is this accidental.

Thanks

Neil