[GHC] #5728: Warnings from -fwarn-incomplete-record-updates even with all constructors matched

[GHC]

#5728: Warnings from -fwarn-incomplete-record-updates even with all constructors
matched
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              Reporter:  mjo         |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:  ⊥
             Component:  Compiler    |          Version:  7.4.1
            Resolution:              |         Keywords:  warnings
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  Incorrect   |       Blocked By:
  warning at compile-time            |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Changes (by simonpj):

 * cc: george.karachalias@…, tom.schrijvers@… (added)


Comment:

 Actually not. The warning was being suppressed by
 {{{
     handleWarnings = if isGenerated origin
                      then discardWarningsDs
                      else id
 }}}
 in `matchWrapper`, which is really intended to suppress warnings in code
 generate by `deriving` etc.  I've fixed this which makes the warning come
 back.

 It's really is part of the pattern-match-fixup problem.  Fortunately,
 Geroge K and Tom S are working on this.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5728#comment:6>
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