Re: [Haskell-cafe] Constructing a datatype given just its constructor as a string?

On Sun, Jun 24, 2007 at 10:55:40PM +0200, Hugh Perkins wrote:

Anyway, the jist of our conversation was that it's not possible to create arbitrary datatypes/constructors from strings in Haskell. Can anyone deny/confirm?

If you want a function like fromConstr, where the 'a' depends on the input string, you can write it in CPS or wrap the result in an existential datatype. But I guess the problem is with "arbitrary", right? Best regards Tomek