[GHC] #1446: -fallow-incoherent-instances suggested when already used

[GHC]

#1446: -fallow-incoherent-instances suggested when already used
----------------------------------+-----------------------------------------
    Reporter:  iampure at gmail.com  |        Owner:         
        Type:  bug                |       Status:  new    
    Priority:  normal             |    Milestone:         
   Component:  Compiler           |      Version:  6.6.1  
    Severity:  normal             |   Resolution:         
    Keywords:                     |   Difficulty:  Unknown
          Os:  Unknown            |     Testcase:         
Architecture:  Unknown            |  
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Comment (by guest):

 I thought I should add a bit more detail about this. I saw it with Windows
 ghc 6.6.1 FWIW. The scenario is you write some code which won't compile
 (ghc giving an error message
 suggesting using this flag will fix the problem). You recompile with this
 flag and get exactly the same error message. There are 2 things wrong with
 this IMO:

 1- (Ideally) ghc should not advise the use of a flag unless it really will
 fix the immediate problem.

 2- It should not give an error message advising the use
 of a flag which has already been used.

 The current behaviour leaves the user (me in this case) wondering if the
 compiler really knows what it's talking about and whether there really is
 a problem in the code or if this is a *real* bug in the compiler (rather
 than just bad
 choice of error messages).

 Adrian Hey

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1446>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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