Stopped at ../mdo.hs:(29,1)-(31,27)
_result :: IO (N a) = _
Stopped at ../mdo.hs:(29,16)-(31,27)
_result :: IO (N Char) = _
x :: Char = 'h'
xs :: [Char] = _
Stopped at ../mdo.hs:29:30-42
_result :: IO (N Char) = _
f :: N Char = _
l :: N Char = _
x :: Char = 'h'
Stopped at ../mdo.hs:(7,1)-(8,42)
_result :: IO (N a) = _