Fix defaulting when local classes are involved
Consider the following program.
class Eq test :: (Eq a, Num a) => a test = 42
The REPL tries to default the type of the expression
Int. But due to the local definition of
Eq this should not happen as it cannot be guaranteed that there is an
Eq instance for
Int (which is not the case in the program above).
This problem can be fixed, if the full qualified class name is considered when defaulting (so
Prelude.Eq instead of