Created attachment 622069 [details] [diff] [review]
This was backed out on inbound due to red:
Original landing and backout on m-c:
This was failing in OSX, and the reds were for Linux. Maybe it's related to OSX having a different sed implementation than Linux.
Yes, OS X uses bsd sed, Linux uses gnu sed.
Created attachment 622495 [details] [diff] [review]
Fix build, v2
This one survives try. Not sure why the old version worked on my system but not on the builders.