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14. Alternative design choices and avenues for improvement

Here we summarise aspects of Green Card that are less than ideal, and indicate possible improvements.

Automatic DIS generation.

Pretty much every newtype or single-constructor declaration that is involved in a foreign language call needs a corresponding %dis definition. Maybe this %dis definition should be automated. On the other hand, there are many fewer data types than procedures, so perhaps it isn't too big a burden to define a %dis for each.

Alternatively, go the other way and have Green Card generate a Haskell type from a %dis definition, along the lines of what %enum already does.

Error handling.

The error handling provided by %fail is fairly rudimentary. It isn't obvious how to improve it in a systematic manner though.