@code_warntype gives yellow ::Union{Nothing, Tuple{Int64,Int64}} in for loops

[lmiq]

@claudio20497

function f()
    for i in 1:2
    end
end

The for loop returns that union always which is either the termination (nothing) or the text iterate. That is normal and you should not worry about it.

This is the section of the manual explaining the iterators’ interfaces.