Failing test for issue #173.
Failing test for issue #173.

abhaga/substance,TypesetIO/substance,stencila/substance,TypesetIO/substance,substance/substance,andene/substance,michael/substance-1,andene/substance,jacwright/substance,substance/substance,michael/substance-1,jacwright/substance,podviaznikov/substance,podviaznikov/substance,abhaga/substance