[GHC] #13150: unknown warning is not reported by GHC

[GHC]

#13150: unknown warning is not reported by GHC
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        Reporter:  jonaprieto        |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  MacOS X           |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  error/warning at compile-time      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by bgamari):

 * cc: quchen, hvr (added)


Comment:

 Relatedly, I wonder whether we should split up `Wwarnings-deprecations`
 into two distinct flags: `Wwarnings` and `Wdeprecations`, as I can imagine
 cases where users may want to make one `Werror` but not the other.

 Ccjng quchen and hvr, who have both thought about the structure of our
 warning flags quite a bit.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13150#comment:1>
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