> The problem with this approach is that different labels do not have > different representations at the value level.
I think this is an advantage, because it means you don't have to carry this stuff about at runtime. > This allows me to pattern match records, since I can construct record > patterns that contain fixed labels: > > X :& MyName1 := myValue1 :& MyName2 := myValue2 > > I cannot see how this could be done using kind String. Do you see a > solution for this? > > A similar problem arises when you want to define a selector function. > You could implement a function get that receives a record and a label as > arguments. However, you could not say something like the following then: > > get myRecord MyName1 > > Instead, you would have to write something like this: > > get myRecord (Label :: MyName1) Just define a constant myName1 = Label :: MyName1 for each label you actually use, and you can use it in both get and pattern matching Barney. _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users