[GHC] #7713: Panic! make_exp (App _ (Coercion _)) when compiled with -fext-core

[GHC]

#7713: Panic! make_exp (App _ (Coercion _)) when compiled with -fext-core
---------------------------------+------------------------------------------
    Reporter:  EduardSergeev     |       Owner:                    
        Type:  bug               |      Status:  new               
    Priority:  normal            |   Milestone:                    
   Component:  Compiler          |     Version:  7.6.2             
    Keywords:  -fext-core panic  |          Os:  Linux             
Architecture:  x86_64 (amd64)    |     Failure:  Compile-time crash
  Difficulty:  Unknown           |    Testcase:                    
   Blockedby:                    |    Blocking:                    
     Related:                    |  
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Changes (by simonpj):

  * difficulty:  => Unknown


Comment:

 Indeed.  In `MkExternalCore` we see:
 {{{
 make_exp (App _e (Coercion _co)) = error "make_exp (App _ (Coercion _))"
 -- TODO
 }}}
 Generally, External Core lacks a proper treatment of the coercions of
 Core.

 Does anyone feel like looking at this?  It's pretty straightforward:
  * The External Core data type
  * Concrete syntax
  * Parsing
  * Pretty printing
  * Conversion to and from Core

 Generally, External Core could do with some love.

 Simon

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7713#comment:1>
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