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A possible definition of foldAST for exercise A f)
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| foldAST :: (Name -> Op -> Name -> a) -> (Name -> a) -> ([Argument] -> a -> a) -> AST -> a | |
| foldAST fb fv ff = f | |
| where f (BinExpr n1 o n2) = fb n1 o n2 | |
| f (Variable n) = fv n | |
| f (Function ps a) = ff ps $ f a |
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