GHCi produces a cryptic message when using HPC
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
Discovered while investigating #9878 (closed).