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infix 6 +
datatype 'a list = Nil | :: of 'a * 'a list
fun x + y = __builtin "add" (x, y)
fun foldl _ acc Nil = acc
| foldl f acc (x :: xs) = foldl f (f (x, acc)) xs
val _ = __builtin "exit" (foldl op + 0 (1 :: 2 :: 3 :: 6 :: 8 :: 10 :: 12 :: Nil))
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