--- /dev/null
+import "Prelude" hiding (scanl)\r
+\r
+scanl :: (b -> a -> <e> b) -> b -> [a] -> <e> [b]\r
+scanl f initial l = build (loop initial 0)\r
+ where\r
+ len = length l\r
+ loop cur i accum cons = let nl = cons accum cur\r
+ in if i==len\r
+ then nl\r
+ else loop (f cur (l!i)) (i+1) nl cons\r
+ \r
+main = scanl (+) 0 [1,2,3]\r
+--\r
+[0, 1, 3, 6]
\ No newline at end of file