dataTypeConstrs gives unhelpful error message

Take the following program:

import Data.Data
foo = dataTypeConstrs (dataTypeOf (0 :: Int))
-- raises: *** Exception: Data.Data.dataTypeConstrs

The implementation of dataTypeConstrs has the type available as a string at this point, so could easily say:

Exception: Data.Data.dataTypeConstrs is not supported for Int, 
           as it is not an algebraic data type