Stopped at ../mdo.hs:(30,1)-(32,27)
_result :: IO (N a) = _
Stopped at ../mdo.hs:(30,16)-(32,27)
_result :: IO (N Char) = _
x :: Char = 'h'
xs :: [Char] = _
Stopped at ../mdo.hs:30:30-42
_result :: IO (N Char) = _
f :: N Char = _
l :: N Char = _
x :: Char = 'h'
Stopped at ../mdo.hs:(8,1)-(9,42)
_result :: IO (N a) = _