[GHC] #2237: qualified names not permitted everywhere in instances

[GHC]

#2237: qualified names not permitted everywhere in instances
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 Reporter:  claus              |          Owner:         
     Type:  bug                |         Status:  closed 
 Priority:  normal             |      Milestone:         
Component:  Compiler (Parser)  |        Version:  6.9    
 Severity:  normal             |     Resolution:  invalid
 Keywords:                     |     Difficulty:  Unknown
 Testcase:                     |   Architecture:  Unknown
       Os:  Unknown            |  
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Comment (by claus):

 Replying to [comment:4 simonpj]:
 > OK I think we are agreeing that GHC implements the spec.  We can argue
 separately about whether the language should be changed!

 yes, agreed. one suggestion: could GHC point to the spec for this error
 message in the case of an instance method definition? something like
 {{{
 Qualified name in instance method definition: ..
 please refer to Section 4.3.2 of the Haskell 98 report
 }}}
 as part of the message would have spared me the confusion, by pointing out
 that (a) the compiler is aware of the non-toplevel context and (b) there
 is a spec reason for the restriction.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2237#comment:5>
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