[GHC] #12188: Pattern variables bound by PatternGuards are not accessible in where clause

[GHC]

#12188: Pattern variables bound by PatternGuards are not accessible in where clause
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        Reporter:  heisenbug         |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:  invalid           |             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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Changes (by goldfire):

 * status:  new => closed
 * resolution:   => invalid


Comment:

 Right now, GHC works the other way, accepting this:

 {{{#!hs
 foo :: Int -> Int
 foo x
   | should_add = x + 1
   | otherwise  = x - 1
   where
     should_add = x > 0
 }}}

 I've not checked to see whether this is specified in the Report, but my
 guess is that it is.

 I'm closing as invalid, but do reopen if I've misunderstood.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12188#comment:2>
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