+ The worker is very like a primop, in that it has no binding.
+
+ Newtypes currently do get a worker-Id, but it is never used.
+
+
+ The "wrapper Id", $wC, whose type is exactly what it looks like
+ in the source program. It is an ordinary function,
+ and it gets a top-level binding like any other function.
+
+ The wrapper Id isn't generated for a data type if the worker
+ and wrapper are identical. It's always generated for a newtype.
+
+
+
+A note about the stupid context
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Data types can have a context:
+
+ data (Eq a, Ord b) => T a b = T1 a b | T2 a
+
+and that makes the constructors have a context too
+(notice that T2's context is "thinned"):
+
+ T1 :: (Eq a, Ord b) => a -> b -> T a b
+ T2 :: (Eq a) => a -> T a b
+
+Furthermore, this context pops up when pattern matching
+(though GHC hasn't implemented this, but it is in H98, and
+I've fixed GHC so that it now does):
+
+ f (T2 x) = x
+gets inferred type
+ f :: Eq a => T a b -> a