Data instance for Data.Map is incomplete
There's no dataCast1 defined for Data.Map. This makes the ext1 family unusable with Maps, since ext is built on dataCast rather than gcast.
Observe:
Prelude Data.Data Data.Generics Data.Map> gcast1 (Just empty :: forall d. (Data d) => Maybe (Map Int d)) :: Maybe (Maybe (Map Int Int))
Just (Just (fromList []))
Prelude Data.Data Data.Generics Data.Map> dataCast1 (Just empty :: forall d. (Data d) => Maybe (Map Int d)) :: Maybe (Maybe (Map Int Int))
NothingTrac metadata
| Trac field | Value |
|---|---|
| Version | 7.0.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | libraries/base |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |
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