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Consider the following program.

class Eq

test :: (Eq a, Num a) => a
test = 42

The REPL tries to default the type of the expression test to 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 Eq).