[Haskell-beginners] literate programming

Does literate programming in haskell (.lhs) support the idea in Knuth's WEB of using aliases for blocks of code? In other words doing something like main = do <part 1> <part 2> <part 1> === putStrLn "foo" <part 2> === putStrLn "bar" (except I don't know what the actual syntax is) -Dennis