On Fri, Feb 27, 2009 at 3:07 PM, Oliver Mooney <[email protected]>wrote:
> Sorry, in my original code the declared variables didn't match the function
> names. I've fixed that below:
> declare DiffListToList DiffListFromList
>
> fun {DiffListFromList L}
> case L
> of Elem|nil then Hole in Elem|Hole#Hole
>
^^^^^^^^^^^^^^^
The operator '#' has higher priority than '|'! Therefore the expression
above does not return a pair, but an ill-defined list with a pair in one of
its tails. Try (Elem|Hole)#Hole instead.
[] H|T then H|{DListFromList T}
> end
> end
>
By the way, you can also define that function by reusing Append:
fun {DiffListFromList L}
T in {Append L T}#T
end
Cheers,
raph
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