+ = FieldLabel Name -- Also used as the Name of the field selector Id
+
+ TyCon -- Parent type constructor
+
+ Type -- Type of the field; may have free type variables that
+ -- are the tyvars of its parent *data* constructor, and
+ -- those will be the same as the tyvars of its parent *type* constructor
+ -- e.g. data T a = MkT { op1 :: a -> a, op2 :: a -> Int }
+ -- The type in the FieldLabel for op1 will be simply (a->a).
+
+ FieldLabelTag -- Indicates position within constructor
+ -- (starting with firstFieldLabelTag)
+ --
+ -- If the same field occurs in more than one constructor
+ -- then it'll have a separate FieldLabel on each occasion,
+ -- but with a single name (and presumably the same type!)