Error detected while processing /Users/tpowell/.vim/plugins/vim-fugitive/plugin/fugitive.vim:
line 471: E1208: -complete used without allowing argumentsline 472: E1208: -complete used without allowing argumentsline 476: E1208: -complete used without allowing argumentsline 479: E1208: -complete used without allowing argumentsPress ENTER or type command to continue

Fixed by changing -nargs=0 instances in fugitive.vim to -nargs=?

Found via https://github.com/mhinz/vim-sayonara/pull/19/commits/7e774f58c5865d9c10d40396850b35ab95af17c5