#1608: Newtype deriving error messages coming out too late
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Reporter: simonpj | Owner: simonpj
Type: bug | Status: closed
Priority: normal | Milestone: 6.10 branch
Component: Compiler (Type checker) | Version: 6.6.1
Severity: normal | Resolution: fixed
Keywords: | Difficulty: Unknown
Testcase: drvfail012 | Architecture: Unknown
Os: Unknown |
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Changes (by simonpj):
* testcase: => drvfail012
* status: new => closed
* resolution: => fixed
Comment:
And indeed this is just what GHC (6.8 and HEAD) now does:
{{{
Der.hs:3:0:
No instance for (Eq (Ego a))
arising from the 'deriving' clause of a data type declaration
at Der.hs:3:0-35
Possible fix: add an instance declaration for (Eq (Ego a))
When deriving the instance for (Ord (Ego a))
}}}
So it's fixed, with no merging to be done. I've added a test case to the
test suite though.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1608#comment:1>
GHC <http://www.haskell.org/ghc/>
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