[GHC] #5791: Defer other kinds of errors until runtime, not just type errors

[GHC]

#5791: Defer other kinds of errors until runtime, not just type errors
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    Reporter:  simonmar          |       Owner:                  
        Type:  task              |      Status:  new             
    Priority:  normal            |   Milestone:  7.6.1           
   Component:  Compiler          |     Version:  7.2.2           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:  5778              |  
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 In #5778 we added `-fdefer-type-errors` to turn type errors into warnings.
 We can do this for other kinds of errors too, notably out-of-scope errors,
 and there are plenty more errors that can be deferred by replacing the
 erroneous subexpression by a call to `error`.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5791>
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