[GHC] #7294: -fdefer-type-errors doesn't produce a warning

[GHC]

#7294: -fdefer-type-errors doesn't produce a warning
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 Reporter:  Feuerbach                    |          Owner:                  
     Type:  bug                          |         Status:  new             
 Priority:  normal                       |      Component:  Compiler        
  Version:  7.6.1                        |       Keywords:                  
       Os:  Unknown/Multiple             |   Architecture:  Unknown/Multiple
  Failure:  GHC accepts invalid program  |       Testcase:                  
Blockedby:                               |       Blocking:                  
  Related:                               |  
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Comment(by Feuerbach):

 In fact, the false warning is produced regardless of -fdefer-type-errors.
 Is it a known limitation, or should I open a separate ticket for it?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7294#comment:1>
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