[Haskell-cafe] Obtaining kind of a HsType

Alejandro Serrano Mena trupill at gmail.com
Sun Jul 20 12:45:02 UTC 2014

Dear Haskell-café,
I'm trying to get some information of the kinds of types in a program. In
particular, I want to obtain the kinds of arguments to type family
instances, that is, given:

type family F a b :: Nat
type instance F (List k) b = b

I would like to obtain the kinds of "k" and "b" in the left-hand side of
the type instance.

In particular, I'm obtaining type family instance information via
LTyFamInstEqn [
Inside, I get a list of binders of type HsWithBndrs [LHsType name]. I'm
assuming each of the LHsTypes inside is a pattern in the type family
instance. Thus, I'm looking at those elements and try to find their kind

Thus, the specific question is: given a HsType, can I obtain its kind

Thanks in advance
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