[GHC] #13090: Expose all unfoldings of overloaded functions by default

[GHC]

#13090: Expose all unfoldings of overloaded functions by default
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        Reporter:  mpickering        |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2929
       Wiki Page:                    |
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Comment (by rwbarton):

 I'm not sure I agree with either

 * Users expect their overloaded functions to be specialised at call sites

 or

 * A more sensible default is to [copy the code of every overloaded
 function into every module which uses it once for every time at which it
 is used]

 I would be more worried about the effects on program size and compile time
 than on interface file size. Maybe instead an opt-in flag `-fexpose-all-
 overloaded-unfoldings`?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13090#comment:1>
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