[GHC] #11789: Flag suggestion does not always work

[GHC]

#11789: Flag suggestion does not always work
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           Reporter:  nomeata        |             Owner:
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Driver         |           Version:  8.1
           Keywords:  newcomer       |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Usually, GHC is very helpfully telling me about misspelled flags, but
 sometimes it fails. Did not yet look deeper, but when I wrote `-fppr-
 cols=1000` it did not suggest `-dppr-cols=1000`. I am not sure if this is
 due to the `=` or whether it branches on `-f` vs. `-d` earlier. This
 surely can be improved! Likely newcomer-friendly..

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11789>
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