[GHC] #1232: generalise runhaskell to support arbitrary file names, not just those with .{l}hs extensions

[GHC]

#1232: generalise runhaskell to support arbitrary file names, not just those with
.{l}hs extensions
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 Reporter:  Frederik         |          Owner:             
     Type:  feature request  |         Status:  new        
 Priority:  normal           |      Milestone:  6.8        
Component:  Compiler         |        Version:  6.6        
 Severity:  normal           |     Resolution:             
 Keywords:  runhaskell       |     Difficulty:  Easy (1 hr)
 Testcase:                   |   Architecture:  Multiple   
       Os:  Unknown          |  
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Changes (by simonmar):

  * difficulty:  Moderate (1 day) => Easy (1 hr)

Comment:

 Isn't the easiest thing to do to make runghc/runhaskell pass "-x hs" to
 GHC?  I had a patch lying around to do this, but hadn't pushed it because
 not all GHCs support the -x flag, and now I've misplaced the patch.

 I suppose one difficulty is that we don't know whether the file is
 supposed to be .hs or .lhs, so we'd have to fix one of these as the
 default, and probably lhs is the most portable because #! in .hs files is
 a GHC extension.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1232>
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