#7126: Unexpected loop

#7126: Unexpected loop
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 Reporter:  boris                        |          Owner:                   
     Type:  bug                          |         Status:  new              
 Priority:  normal                       |      Component:  Compiler         
  Version:  7.4.1                        |       Keywords:  class, hang, loop
       Os:  Unknown/Multiple             |   Architecture:  Unknown/Multiple 
  Failure:  Incorrect result at runtime  |       Testcase:                   
Blockedby:                               |       Blocking:                   
  Related:                               |  
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 The attached program executes as expected if compiled with GHC 7.0.3, but
 crashes with <<loop>> for GHC 7.4.1. When the code was more polymorphic
 (before simplifying the case), it just hanged. I suspect that the loop is
 related to the class dictionaries creation/passing.

 Expected:
 {{{
 "1"
 "1"
 }}}

 Actual:
 {{{
 "1"
 bug: <<loop>>
 }}}

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7126>