Standalone deriving doesn't do newtype deriving properly
I'd expect the following two declarations to have identical behavior:
newtype S1 x y a = S1 (M S x y a) deriving IxMonad
newtype S2 x y a = S2 (M S x y a)
deriving instance IxMonad S2
Results:
$ ghc-6.11.20081005 -c deriving.hs
deriving.hs:15:0:
Can't make a derived instance of `IxMonad S2'
(even with cunning newtype deriving:
the representation type has wrong kind)
In the stand-alone deriving instance for `IxMonad S2'
Trac metadata
Trac field | Value |
---|---|
Version | 6.11 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
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