Start with assignment 13

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+implementation module Util
+
+import StdClass
+from StdFunc import id, o
+import StdInt
+import StdList
+import StdOverloaded
+import StdString
+
+from Text import class Text(concat), instance Text String
+
+instance zero PrState
+where
+	zero =
+		{ indent = 0
+		, output = []
+		}
+
+printToString :: a -> String | print a
+printToString x = concat (print x zero).output
+
+instance print String where print s = \st -> {st & output=[s:st.output]}
+instance print Int    where print i = \st -> {st & output=[toString i:st.output]}
+
+nl :: PrState -> PrState
+nl st = {st & output=["\n":repeatn st.indent "\t"] ++ st.output}
+
+indent :: PrState -> PrState
+indent st = {st & indent=max 0 (st.indent - 1)}
+
+unindent :: PrState -> PrState
+unindent st = {st & indent=st.indent + 1}
+
+prsperse :: a [b] -> PrState -> PrState | print a & print b
+prsperse _ []     = id
+prsperse _ [x]    = print x
+prsperse g [x:xs] = print x o print g o prsperse g xs