#3087: Derived instances of Data lack dataCast1 and dataCast2
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Reporter: dreixel | Owner: simonpj
Type: bug | Status: closed
Priority: normal | Milestone:
Component: Compiler | Version: 6.10.1
Severity: normal | Resolution: fixed
Keywords: | Difficulty: Unknown
Testcase: | Os: Unknown/Multiple
Architecture: Unknown/Multiple |
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Changes (by simonpj):
* status: new => closed
* resolution: => fixed
Comment:
Fixed by
{{{
Fri Mar 13 13:44:36 GMT 2009 [email protected]
* Fix Trac #3087: derived Data now defines dataCast1/2
This patch generates code in deriving(Data) for dataCast1 or 2 as
appropriate.
While I was there I did some refactoring (of course), pulling out
the TcDeriv.inferConstraints as a separate function.
}}}
I don't think it's worth merging this to 6.10.2, even though it's a
bugfix,
because it modifies code that I added in the HEAD only (for deriving
Functor)
so the merge will be sligtly awkward. And there's an easy workaround.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3087#comment:2>
GHC <http://www.haskell.org/ghc/>
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