Listing the files of a package output

[Konrad Hinsen]

Hi Guix,

this looks like a beginner's question, but I can't figure out how to do
this: list the files in a given package output, from the command line (I
do know how to do this in Guile).

For a package with a single output, I can do

  ls -R $(guix build hello)

For a package output other than "out", I can do

  ls -R $(guix build coreutils | grep debug)

But what about coreutils:out?

Cheers,
  Konrad