#5498: Generalized newtype deriving allows creating of instances I can't create
by
hand
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Reporter: dterei | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.3
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Comment(by simonmar):
The fix is to reject the `deriving` clause with an error, right? Couldn't
we fix that without any deep type checker changes, just with a syntactic
restriction on what classes you can derive for a newtype?
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5498#comment:2>
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