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sof authored
Renamer changes: - for a toplevel type signature f :: ty the name 'f' refers to a local definition of 'f' - i.e., don't report 'f' as clashing with any imported 'f's. - tidied up the handling of fixity declarations - misplaced fixity declarations inside class decls, e.g., class F a where infix 9 `f` g :: a -> Int are now caught and reported as errors. Robustified the renaming of class decls.
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