Dear GHC devs,

I am trying to figure out a way to obtain the constraints that hold over a type. Let me give you an example: suppose that I write the following function:

f :: Eq a => [a] -> Bool

f xs = xs == []

If I ask for the type of the Var ' xs', I get back '[a]'. This is correct, but I am missing the crucial information that '[a]' must be Eq.

Is there an easy way to get it? It seems that 'varType' doesn't give me enough information.

Regards,

Alejandro