[Haskell-cafe] comprehension problem

Hi, what does this to code rows mean: newtype Probability = P Float newtype Dist a = D {unD :: [(a, Probability)]} newtype definies a new type called Probability. But what does P Float mean? And what is the a in Dist a? What does D {...} mean? Thanks for your help. -- View this message in context: http://www.nabble.com/comprehension-problem-tp23858359p23858359.html Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.