[GHC] #9437: Wrong error message when using `..' with a record update

12 Aug 2014

      #9437: Wrong error message when using `..' with a record update
-------------------------------------+-------------------------------------
       Reporter:  elliottt           |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Compiler           |                 Version:  7.8.3
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
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 Using `..' inside of a record update should report that it's an error to
 do so, but instead reports that it's an empty update.  Consider this
 module:

 {{{
 {-# LANGUAGE RecordWildCards #-}

 module Test where

 data Foo = Foo { x :: Int }

 test :: Foo -> Foo
 test foo = foo { .. }
 }}}

 When loaded, it complains about the empty record update of `foo`, instead
 of complaining about `..' being used during an update.

 {{{
 GHCi, version 7.8.3: http://www.haskell.org/ghc/  :? for help
 Loading package ghc-prim ... linking ... done.
 Loading package integer-gmp ... linking ... done.
 Loading package base ... linking ... done.
 [1 of 1] Compiling Test             ( test.hs, interpreted )

 test.hs:8:16: Empty record update of: foo
 Failed, modules loaded: none.
 }}}

--
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9437
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