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This pull request implements half of #49. Specifically, it deals with pretty printing instance declarations and most structures needed to support that. This includes pretty printing of associated types (and therefore also type family instances.) However, this _does not_ include pretty printing of associated data types. Pretty printing of type class declarations is to be dealt with at a later time. Instances are formatted such that indentation hangs after the `instance`. Namely, ```haskell instance Eq a => Eq [a] where ``` To support pretty printing associated types, the function `p_tyFamInstEqn` was exported from the appropriate module. This was done to avoid redundant code duplication. |
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