[GHC] #11247: Weird error from running runghc on an invalid input filename

[GHC]

#11247: Weird error from running runghc on an invalid input filename
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        Reporter:  rwbarton          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  7.8.4
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:  runghc/T11247
      Blocked By:                    |             Blocking:
 Related Tickets:  #7765             |  Differential Rev(s):  Phab:D1678
       Wiki Page:                    |
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Comment (by thomie):

 Some possible ways to solve this:
 * Throw an exception when `classifyLdInput` finds an unrecognised input. I
 wonder if this would break anything.
 * Or only throw an exception when the unrecognised input is a file that
 doesn't exist (passing an existing but invalid file would still be a
 warning).
 * Or check before putting files in `ldInputs` whether they exist. This
 affects normal `ghc` make and batch mode as well.

 Do not:
 * modify runghc, since `ghc -e :main foo.bar` has the same problem

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11247#comment:4>
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