dmd latest version bug? ```sh source/bootstrap.d(4,6): Error: only one main allowed. Previously found main at /tmp/dub_test_root-ad0fb2e3-6be1-4ca8-9153-e4fdd5c1b191.d(10,12) dmd failed with exit code 1. ``` Build logs: https://travis-ci.org/huntlabs/hunt-skeleton/jobs/389884419#L480