[GHC] #9903: GHCi produces a cryptic message when using HPC

[GHC]

#9903: GHCi produces a cryptic message when using HPC
-------------------------------------+-------------------------------------
       Reporter:  facundo.dominguez  |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  GHCi               |                 Version:  7.9
       Keywords:  hpc                |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:  GHCi crash
     Blocked By:                     |               Test Case:
Related Tickets:  #9878, #9762 ?     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 The following test produces an impolite response from GHCi

 {{{
 $ cat t.hs
 g :: Int
 g = 1 + 1
 $ ghc-stage2 --interactive t.hs -fhpc
 GHCi, version 7.9.20141217: http://www.haskell.org/ghc/  :? for help
 [1 of 1] Compiling Main             ( t.hs, interpreted )
 Ok, modules loaded: Main.
 *Main> g
 ghc-stage2: panic! (the 'impossible' happened)
   (GHC version 7.9.20141217 for x86_64-unknown-linux):
         Loading temp shared object failed: /tmp/ghc25774_0/ghc25774_5.so:
 undefined symbol: _hpc_tickboxes_Main_hpc

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 }}}
 It has been noted elsewhere (#9878) that these kinds of messages are
 better avoided.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9903>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler