[Haskell-cafe] Getting list of constructors of a Type

Dear Haskell-Café, As part of my Google Summer of Code, I need to get the list of data constructors of a certain data type on a specific scenario. In my case, I'm getting a value of type Type (by calling exprType). I was expecting to be able to call getInfo directly on that value of type Type, but it doesn't have a name nor the constructors of Type are public. Thus, I'm not able to get that information :( Thanks in advance, Alejandro