Missing `instance Pretty CabalSpecVersion`
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re: API
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Description
`Distribution.Pretty` declares a class `Pretty` which has instances for tons of types.
I think the instance for `CabalSpecVersion` has been ~~forgotten~~ when this type was introduced in 3.4.
_deliberately omitted?_
Found this comment: https://github.com/haskell/cabal/blob/1723d220e8de79a0d99d3127784167077fba77b4/Cabal-syntax/src/Distribution/FieldGrammar/Newtypes.hs#L293-L297
There is an `instance Pretty SpecVersion`.
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