[GHC] #1012: ghc panic with mutually recursive modules and template haskell

[GHC]

#1012: ghc panic with mutually recursive modules and template haskell
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 Reporter:  guest             |          Owner:          
     Type:  bug               |         Status:  reopened
 Priority:  normal            |      Milestone:  _|_     
Component:  Template Haskell  |        Version:  6.8.2   
 Severity:  normal            |     Resolution:          
 Keywords:                    |     Difficulty:  Unknown 
 Testcase:  TH_import_loop    |   Architecture:  Multiple
       Os:  Multiple          |  
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Comment (by simonmar):

 Since `ModuleB` is outside the `ModuleA/ModuleC` loop, it can import
 `ModuleA` without creating any new loops, and I bet this will work around
 the problem and get you unblocked.

 What's happening is that the dependency analysis isn't figuring out that
 the real `ModuleA` must be compiled before `ModuleB`.  I think the
 solution is something along the lines of: every module that depends on a
 module in a cycle, but is not a member of that cycle, should have an
 implicit dependency on each of the modules in the cycle.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1012#comment:9>
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