[GHC] #7169: Warning for incomplete record field label used as function

[GHC]

#7169: Warning for incomplete record field label used as function
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        Reporter:  goldfire          |                Owner:  nakaji_dayo
            Type:  feature request   |               Status:  closed
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  7.7
      Resolution:  fixed             |             Keywords:  Warnings,
                                     |  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4083
       Wiki Page:                    |
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Comment (by AntC):

 Replying to [comment:27 Ben Gamari <ben@…>]:
 > {{{
 > Warning on declaring a partial record selector.
 > However, disable warn with field names that start with underscore.
 >
 > }}}

 Eek. I may be too late.

 Don't the lenses people use underscore prefix on record labels? So that TH
 can detect that and produce a lens name with the `_` stripped off? Then
 they're going to miss out on this warning of partiality.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7169#comment:29>
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