[GHC] #15512: Rewrite rules should be able to produce custom compiler errors

[GHC]

#15512: Rewrite rules should be able to produce custom compiler errors
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        Reporter:  ChaiTRex          |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by mpickering):

 I don't think this is the place of the simple mechanism of rewrite rules.

 This can be implemented using a compiler plugin and users could specify
 rules in
 the same manner as a rewrite rule.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15512#comment:1>
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