Expected identifier when parsing expression, got ‘=‘

[stray fox]

module.ChangeCombo = function(chr)
    local combo = chr:GetAttribute("Combo")
    if lastSwing(chr)  then
        local passedTime = os.clock() - lastSwing(chr)
        if passedTime <= 1 then
            if combo >= MaxCombo then
                chr:SetAttribute("Combo", 1)
            else
                chr:SetAttribute("Combo", combo + 1)
            end
            if passedTime >= 1 then
                chr:SetAttribute("Combo", 1)
            end
        end
    end
    lastSwing(chr) = os.clock()
end

why

its on this line
lastSwing(chr) = os.clock()

Expected identifier when parsing expression, got ‘=‘

oka nvm

i realize lastSwing[chr]