[Haskell-beginners] Constructors as functions (was monad transformers)

Michael P Mossey wrote:

In Martin Grabmuller's tutorial "Monad Transformers Step by Step", found here

http://user.cs.tu-berlin.de/~magr/pub/Transformers.pdf

Additional question: in this paper he uses a data constructor in an interesting way: back-quoting it to make it an operator. I thought, "Huh, a constructor is a lot like a function?" I did some experiments and found that I can map a constructor over a list and I can compose a constructor with other functions. Cool. So is a constructor a function, in every sense? Thanks, Mike