[GHC] #9216: hiding imports doesn't seem to check if an import exists

[GHC]

#9216: hiding imports doesn't seem to check if an import exists
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        Reporter:  flazz                        |            Owner:
            Type:  bug                          |           Status:  closed
        Priority:  normal                       |        Milestone:
       Component:  Compiler                     |          Version:  7.6.3
      Resolution:  invalid                      |         Keywords:  import
Operating System:  Unknown/Multiple             |  hiding
 Type of failure:  GHC accepts invalid program  |     Architecture:
       Test Case:                               |  Unknown/Multiple
        Blocking:                               |       Difficulty:
                                                |  Unknown
                                                |       Blocked By:
                                                |  Related Tickets:
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Changes (by goldfire):

 * status:  new => closed
 * resolution:   => invalid


Comment:

 This warning is reported by `-fwarn-dodgy-imports`. This is not considered
 an error, to aid in backward compatibility. In your example, one assumes
 that some past Prelude ''did'' export that symbol. Now that Prelude no
 longer does, it seems a little silly to stop your whole module from
 compiling.

 Thanks for reporting!

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9216#comment:1>
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