#7395: DefaultSignatures conflict with default implementations
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Reporter: cgaebel | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.6.1
Keywords: DefaultSignatures | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: GHC rejects valid program
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: 7346 |
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Changes (by dreixel):
* related: => 7346
Comment:
Replying to [comment:7 hvr]:
> just a thought:
>
> ...what if the default-signature implementation would be only selectable
by using the `deriving` facilities for auto-derivable classes?
I can see the advantages, but there are also some problems. First, it only
works if ALL the methods of the class have defaults (with signature or
not). Second, when using normal deriving (not standalone) the compiler has
to figure out the context for the instance, and this is not easy in
general...
See also #7346.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7395#comment:10>
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