Ausdr"ucke

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> module Expr           (  Ident(..), Expr(..), Prim(..)
>                       )
> where
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> import Support
>
> import Prim           (  Ident(..), Prim(..)  )
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Darstellung von Ausdr"ucken

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> data Expr             =  Var     Ident
>                       |  Lit     Rational
>                       |  AppPrim Prim  Int Expr
>                       |  AppFun  Ident Int Expr
>                       |  Neg     Expr
>                       |  Add     Expr Expr
>                       |  Sub     Expr Expr
>                       |  Mul     Expr Expr
>                       |  Div     Expr Expr
>                       |  Pow     Expr Expr
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