Add instances to ZipList
There was a reasonably uncontroversial vote on the libraries list to add common derived instances (Eq, Ord, Show, Read) to ZipList, which currently only has Functor and Applicative.
I have made the change on my local ghc build and it seems to build, but I can't get validate to pass. I'm not sure if it's my own fault, but considering I only made a one-line change, it seems odd. I'll attach a patch once I make sure it wasn't my fault.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.2.2 |
| Type | FeatureRequest |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | libraries/base |
| Test case | |
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