[Haskell-cafe] Type checking of partial programs
lemming at henning-thielemann.de
Fri Mar 21 06:18:23 EDT 2008
On Thu, 20 Mar 2008, Roberto Zunino wrote:
> ac wrote:
>> foo :: [Foo] -> <placeholder 1>
>> foo xs = map <placeholder 2> xs
>> What are the possible type signatures for placeholder 1 and the possible
>> expressions for placeholder 2?
> A nice GHCi trick I learned from #haskell:
>> :t let foo xs = map ?placeholder2 xs in foo
> forall a b. (?placeholder2::a -> b) => [a] -> [b]
> Also, the djinn tool might provide some actual expression for placeholder 2.
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