[GHC] #9499: Add -prelude-is flag

[GHC]

#9499: Add -prelude-is flag
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        Reporter:  agibiansky        |                   Owner:  agibiansky
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.9
      Resolution:                    |                Keywords:  flag
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:  #9590             |                Blocking:
                                     |  Differential Revisions:  Phab:D171
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Comment (by rwbarton):

 Agree with hvr's comments.

 An quick-and-dirty hack that also works (I don't entirely understand why
 it works, but it does) is just to add a file `Prelude.hs` to your project
 consisting of

 {{{
 module Prelude (module My.Fancy.Prelude) where
 import My.Fancy.Prelude
 }}}

 Apparently this overrides the Prelude module from base for the scope of
 your project, even for the implicit Prelude import in modules that don't
 have an explicit one.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9499#comment:9>
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