>
> because you haven't helped write a patch change it yet :)
>
> -Carter
>
Would this be possible with the new type checker plugins?
btw, your example gives me
Nested type family application
in the type family application: U (n - 1)
(Use UndecidableInstances to permit this)
In the equations for closed type family ‘U’
In the type family declaration for ‘U’
Failed, modules loaded: none.
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