I'm honestly not sure what's going on here, though I am getting this error multiple times in my Objective-C iOS app. I use PureLayout to layout most of my constraints.
2016-11-29 11:14:41.268847 App Name[4775:1882075] Failed to rebuild layout engine without detectable loss of precision. This should never happen. Performance and correctness may suffer.
I get this line 6 times on seemingly random builds of my app. Sometimes when I build, it happens, sometimes it doesn't. Not sure what triggers it.
Clearly it should "never happen" because I can't find anything on Google, Stackoverflow, or PureLayout about it. Unfortunately it happened to me, even though I'm not sure if it's having any actual impacts.