Give an error message for INLINE/SPECIALISE for missing default method
Basically, if the user has written: class Foo a where bar :: a -> a {-# INLINE bar #-} Then we should error out because there is no default method corresponding to the `bar' INLINE pragma. This patch achieves this by splitting the signatures for a class declaration apart into two sets: one that applies to the defaults (INLINE, SPECIALISE), and one which defines the class itself (fixity, type signatures). The two sets are then renamed in different contexts.
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