Bogus unused variable in function argument

[KristofferC]

This code shows var being unused and color-highlighted in gray.

function f(var)
    rand() > 0.5 && (var = 1)
    return var
end

It is however used.

[pfitzseb]

Well, it is used in 50% of function calls... :) But yes, we don't currently handle this kind of conditional assignment well at all.

[IanButterworth]

I don't know if this is the right "unused variable" issue to add examples to, but Base.@kwdef's code shows params_ex and call_args as unused while they are