[Haskell-cafe] Is it possible to get the information of instances of a type?

[Evan Laforge]

> No, this lists all the instances of a class.  OP asked for the classes
> of which a given type is an instace.
>
> Presumably it is possible, since Haddock does it!  In the
> documentation generated for a type it lists classes of which the type
> is an instance.  So you might want to look at how Haddock does it.  I
> suspect the only way is through the GHC API.

ghci :info does it too.