Found this one:

This is partly working:

import Data.Char

x = "aBCde".isLower
-- Note that comments are preceded by two hyphens
{- or enclosed
   in curly brace/hypens pairs. -}
main = print x


But now I see this error: 

• Main.hs@3:5-3:12

  Couldn't match expected type `b0 -> c0' with actual type `[Char]' In the first argument of `(.)', namely `"aBCde"' In the expression: "aBCde" . isLower In an equation for `x': x = "aBCde" . isLower
• In an equation for `x': x = "aBCde" . isLower
  

Roelof