[GHC] #12068: RULE too complicated to desugar when using constraint synonyms

[GHC]

#12068: RULE too complicated to desugar when using constraint synonyms
-------------------------------------+-------------------------------------
        Reporter:  crockeea          |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by thomie):

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


Comment:

 commit a6f0f5ab45b2643b561e0a0a54a4f14745ab2152
 {{{
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Tue Dec 23 15:39:50 2014 +0000

     Eliminate so-called "silent superclass parameters"
 }}}

 > It works in HEAD ... I'm not sure if it's worth adding a regression
 test.

 Closing.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12068#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler