There are situations where the Julia syntax highlighter fails, as seen here:
It seems that μ' is somehow causing problems. Note that the single quote in Julia (') directly attached to a variable or expression can be used to transpose it. Maybe the lexer is confused and searches for a closing one? No idea…
Thanks for the feedback and apologies for the delay! I’ve taken your suggestion and passed it along to the appropriate teams. Thanks again for reaching out 
This doesn’t seem to be fixed yet. Any julia instance with quotes is broken: https://gist.github.com/guenter-r/7274ec3fbf349ed7ce70444bf0be1f1a#file-start-jl
The syntax highlighter is broken in many ways. It already fails for a line where I see no reason why the highlighter would choke: https://github.com/JuliaPhysics/Corpuscles.jl/blob/a56416f7a042c09f75b00635df869e7c93b6c36f/src/Corpuscles.jl#L14
I am not sure how to contribute to this but if it’s somehow open source, I am sure that we (Julia users) can jump in and help out.
There is also a Julia package which can help: https://github.com/JuliaDocs/Highlights.jl
Given that Julia is already in the top 30 of the most popular languages (according to TIOBE: https://www.tiobe.com/tiobe-index/), I think this problem deserves a bit more priority 