Martin von Zweigbergk <martinvonz@google.com> [Fri, 06 Jul 2018 16:45:44 -0700] rev 38589
context: raise ProgrammingError on repo['my-tag']
We had an internal extension that I had failed to migrate off of the
deprecated API and its "'my-tag' in repo" check just started returning
False. It took a while to figure out that that was what was
happening. This patch would have helped.
Differential Revision: https://phab.mercurial-scm.org/D3895