[GHC] #5218: Add unpackCStringLen# to create Strings from string literals

[GHC]

#5218: Add unpackCStringLen# to create Strings from string literals
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        Reporter:  tibbe             |                Owner:  thoughtpolice
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.0.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #5877 #10064      |  Differential Rev(s):  Phab:D2443
       Wiki Page:                    |
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Comment (by simonpj):

 I've lost context on this. The trac ticket is very long, and I'm no longer
 sure
  * What, exactly, is the problem we are trying to solve?
  * What's the overview of the proposed solution?
  * How the solution works in detail

 I wonder whether you might write a wiki page on Literal Strings, to
 describe how literal strings are handled, at least in your proposal?

 Are there any tests that check that the problem is indeed solved?

 I notice that the Phab patch changes `.gitmodules` to point to your repos,
 which presumably can't be right for a commit to GHC master.

 Sorry to be dense.  Thanks.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5218#comment:54>
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