Regression: hp2ps reports `integer unexpected` on new style package keys

hp2ps reports integer unexpected when run on a profile file created with HEAD. The profile file contains entries such as the following:

$ grep System.Random Test.hp 
9Kgekc9yEaLHLNUuw6paWL:System.Random.StdGen	24
9Kgekc9yEaLHLNUuw6paWL:System.Random.StdGen	24
9Kgekc9yEaLHLNUuw6paWL:System.Random.StdGen	24
9Kgekc9yEaLHLNUuw6paWL:System.Random.StdGen	24

To reproduce, first install random (there might be a simpler way, but this one is required to run make TEST=concprog002 WAY=threaded2_hT, which is failing at the moment):

$ cabal install random==1.1 --with-ghc=ghc-7.11.20150711 -v0

Note the package key for random starts with a number:

$ ghc-pkg --package-db=.ghc/x86_64-linux-7.11.20150711/package.conf.d/ describe random | grep key
key: 9Kgekc9yEaLHLNUuw6paWL

Then create a heap profile for the following program with -hT, and try to run hp2ps on it:

$ cat Test.hs
import System.Random
main = sequence $ replicate 1000 (randomIO :: IO Int)

$ ghc-7.11.20150711 Test.hs -rtsopts -fforce-recomp -v0

$ ./Test +RTS -hT -i0.001

$ hp2ps Test.hp
hp2ps: Test.hp, line 12: integer unexpected

Note that in the profile file the entries for libraries like base, ghc-prim and integer-gmp don't contain package keys (maybe the entries for random shouldn't either?):

 base:Data.Dynamic.Dynamic       24
 integer-gmp:GHC.Integer.Type.Jp#        16
 ghc-prim:GHC.Types.:    24

Trac metadata

Trac field	Value
Version	7.11
Type	Bug
TypeOfFailure	OtherFailure
Priority	high
Resolution	Unresolved
Component	Profiling
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	ezyang
Operating system
Architecture