#3888: Suggest -XGeneralizedNewtypeDeriving for newtypes
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Reporter: guest | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: Compiler | Version: 6.12.1
Resolution: fixed | Keywords:
Difficulty: | Os:
Unknown/Multiple
Testcase: typecheck/should_fail/tcfail117 | Architecture:
Unknown/Multiple
Failure: None/Unknown |
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Changes (by simonpj):
* status: new => closed
* testcase: => typecheck/should_fail/tcfail117
* resolution: => fixed
Comment:
Good idea. Fixed by
{{{
Mon Mar 1 11:15:55 GMT 2010 [email protected]
* Suggest -XGeneralizedNewtypeDeriving (fix Trac #3888)
If we can't derive a type, but it's a reasonable possibility that
newtype deriving would do the job, suggest it.
A little refactoring too, moving non_iso_class to top level,
and putting it with std_class_via_iso.
M ./compiler/typecheck/TcDeriv.lhs -12 +23
}}}
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3888#comment:1>
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