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Merge branch 'master' of git.martlubbers.net:clean-tests
[clean-tests.git]
/
expr
/
exist
/
exist.dcl
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definition module exist
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from Data.Either import :: Either
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:: Expr
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= Lit Int
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| Var String
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| (+.) infixl 6 Expr Expr
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| E.e: Ext e & eval e & print e
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class eval m :: m -> ([(String, Int)] -> Either String Int)
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class print m :: m -> String
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instance eval Expr
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instance print Expr