Are they meant to work? I could only find one meaning of them not working (issue 5778 <https://github.com/JuliaLang/julia/issues/5778>).
Here's an example: julia> for i = 1:10 println(i) end 1 2 3 4 5 6 7 8 9 10 julia> for i = 10:1 println(i) end julia>