[GHC] #5972: option to suppress (Monomorphic) record selector functions

[GHC]

#5972: option to suppress (Monomorphic) record selector functions
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        Reporter:  AntC              |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:
      Resolution:                    |             Keywords:  records
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by adamgundry):

 @AntC I think mpickering's point is that inside GHC, a(n unambiguous)
 field label is identified by the `Name` of its selector function when used
 inside curly braces. There's no real distinction between the two made by
 the implementation. Changing that would be possible, but tedious.

 In the post-DuplicateRecordFields implementation, it is possible to
 distinguish between fields and non-fields during name resolution. Thus it
 probably wouldn't be too hard to implement a variant on this whereby
 enabling the extension suppressed all selector functions (local or
 imported) //for expressions in the current module//, just as
 DuplicateRecordFields changes the name resolution rules within a single
 module. The selectors would still be generated, they just wouldn't be in
 scope.

 That wouldn't quite give the behaviour you describe on the wiki page with
 regard to import/export, because if you exported a field then client
 modules could use it as a selector (unless they enable the extension
 themselves). You would have the option to hide the field and export a lens
 of the same name though.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5972#comment:15>
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