$ ./pants buildgen.go --materialize --remote contrib/go/::
INFO] Detected git repository at /home/jsirois/dev/3rdparty/pants on branch master

22:32:39 00:00 [main]
               See a report at: <http://localhost:55164/run/pants_run_2015_10_22_22_32_39_606_7a1672104412429db2ceac6ff9afad42>
22:32:39 00:00   [bootstrap]
22:32:39 00:00   [setup]
22:32:39 00:00     [parse]
               Executing tasks in goals: buildgen
22:32:39 00:00   [buildgen]
22:32:39 00:00     [go]
                   buildgen.go ignoring targets passed on the command line and re-materializing the complete Go BUILD forest.
FAILURE: Can only BUILD gen for a single Go local sources source root, found:
	contrib/go/examples/3rdparty/go
	contrib/go/examples/src/go


22:32:39 00:00   [complete]
               FAILURE