[GHC] #7844: Panic messages raised from GHCi don't include details

[GHC]

#7844: Panic messages raised from GHCi don't include details
-----------------------------+----------------------------------------------
Reporter:  parcs             |          Owner:                  
    Type:  bug               |         Status:  new             
Priority:  normal            |      Component:  GHCi            
 Version:  7.7               |       Keywords:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
 Failure:  None/Unknown      |      Blockedby:                  
Blocking:                    |        Related:                  
-----------------------------+----------------------------------------------
 In GHC built the `devel2` way, compiling the following source file through
 GHC causes a compiler panic:

 {{{
 f :: (Num Int => Num) () => ()
 f = undefined
 }}}

 {{{
 [1 of 1] Compiling Main             ( tmp/xxx.hs, tmp/xxx.o )
 ghc-stage2: panic! (the 'impossible' happened)
   (GHC version 7.7.20130416 for x86_64-unknown-linux):
         ASSERT failed!
     file compiler/types/Type.lhs line 1623
     base:GHC.Num.Num{tc 2b} ghc-prim:GHC.Types.Int{(w) tc 3J} =>
     base:GHC.Num.Num{tc 2b}
     ghc-prim:GHC.Prim.*{(w) tc 34d}
     -> ghc-prim:GHC.Prim.Constraint{(w) tc 34s}

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

 }}}

 However, if you try to compile the same file through GHCi, you get a panic
 message but without the important details:

 {{{
 Prelude> :load tmp/xxx.hs
 [1 of 1] Compiling Main             ( tmp/xxx.hs, interpreted )
 ghc-stage2: panic! (the 'impossible' happened)
   (GHC version 7.7.20130416 for x86_64-unknown-linux):
         ASSERT failed!
 <<details unavailable>>

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7844>
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