> Can't seem to reproduce.  Can you give the backtrace with 10770?

It will only fail if the pkg isn't in the world file already.

%% emerge --noreplace gcc:4.2
Calculating dependencies... done!
Traceback (most recent call last):
  File "/home/jolexa/portage/linux-64/usr/bin/emerge", line 20, in <module>
    retval = _emerge.emerge_main()
  File "/home/jolexa/portage/linux-64/usr/lib/portage/pym/_emerge/__init__.py",
line 9542, in emerge_main
    myopts, myaction, myfiles, spinner)
  File "/home/jolexa/portage/linux-64/usr/lib/portage/pym/_emerge/__init__.py",
line 8874, in action_build
    mydepgraph.saveNomergeFavorites()
  File "/home/jolexa/portage/linux-64/usr/lib/portage/pym/_emerge/__init__.py",
line 5375, in saveNomergeFavorites
    colorize("INFORM", a)
  File "/home/jolexa/portage/linux-64/usr/lib/portage/pym/portage/output.py",
line 304, in colorize
    return codes[color_key] + text + codes["reset"]
TypeError: cannot concatenate 'str' and 'Atom' objects

With rc1:
%% sudo emerge --noreplace --color=y gcc:4.1
Calculating dependencies... done!
>>> Recording sys-devel/gcc:4.1 in "world" favorites file...
>>> Auto-cleaning packages...

>>> No outdated packages were found on your system.
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