[GHC] #11173: Infix declarations for record fields with DuplicateRecordFields are broken

[GHC]

#11173: Infix declarations for record fields with DuplicateRecordFields are broken
-------------------------------------+-------------------------------------
           Reporter:  kanetw         |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.11
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  GHC rejects
  Unknown/Multiple                   |  valid program
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The following program compiles fine
 {{{#!hs
 module Good where
 newtype A = A { foo :: Int }
 infixl 5 `foo`
 }}}

 but this one doesn't

 {{{#!hs
 {-# LANGUAGE DuplicateRecordFields #-}
 module Bad where
 newtype A = A { foo :: Int }
 infixl 5 `foo`
 }}}
 giving an error
 {{{
 The fixity signature for ‘foo’ lacks an accompanying binding
  (The fixity signature must be given where ‘foo’ is declared)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11173>
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