Dear list,

Is it possible te get the number of fields for data constructors for a plain ADT, i.e something with no record fields? E.g for

data T = A Int Double | B String (Maybe String)

it would give 2 for both `A` and `B`.

For a record it's possible using the `constrFields` function from Data.Data.

I was trying to follow this tutorial by Christopher Done https://chrisdone.com/posts/data-typeable, and I feel that it must be possible somehow to get these numbers with the gmap*/gfold* functions, but the use of them is over my head at the moment.


Best,



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Markus Läll