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@ -34,6 +34,7 @@ joy stack expression =
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joy_eval : String -> JList -> JList -> Result String (JList, JList)
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joy_eval symbol stack expression =
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case symbol of
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"i" -> joy_i stack expression
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"+" -> joy_binary_math_op (+) stack expression
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"-" -> joy_binary_math_op (-) stack expression
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"*" -> joy_binary_math_op (*) stack expression
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@ -56,6 +57,13 @@ joy_eval symbol stack expression =
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_ -> Err ("Unknown word: " ++ symbol)
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joy_i : JList -> JList -> Result String (JList, JList)
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joy_i stack expression =
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case pop_list(stack) of
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Ok (a, s0) -> Ok (s0, a ++ expression)
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Err msg -> Err msg
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joy_binary_math_op : (Int -> Int -> Int) -> JList -> JList -> Result String (JList, JList)
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joy_binary_math_op op stack expression =
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case pop_int(stack) of
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