mapping over a field, changing its type?
Open
- Dominant language
- Haskell
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- 83
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Description
Is there a specific implementation reason why this function is not possible:
```
modify :: forall l v v2 lts rts. (Has lts l v, ???) => FldProxy l -> (v -> v2) -> Rec lts -> Rec rts
```
Is it impossible to have a constraint that relates `lts` to `rts`?
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