If one creates a Julia file and writes some code into it, one would expect all declared variables to be shown in the symbols list on the left. However, this is not the case, for instance in this code here: ``` a::Int8 = 3
function f(x) return 2x end ``` the variable `a` is not shown in the symbols list, but the function `f` is shown. Is this the normal behavior or is it a bug?