Linter reports missing reference for assignments within while block condition

[Holbormon]

Consider the following MRE:

function rand_or_nothing()

    if (foo = rand()) < .5
        return foo
    end

    return foo + 1

end

while (bar = rand_or_nothing()) < .7
    display(bar)
end

display(bar)

While foo is correctly detected by the linter as being well-defined in both of its occurences, bar is reported as a "missing reference" in the second call to display (but not in the first call inside the while loop).

The code runs fine (without warning) when interpreted by Julia.