This is no longer a part of the World of Warcraft API. Replaced by IsModifiedClick("AUTOLOOTTOGGLE") It was removed in patch 2.2.

Checks whether the autoloot key is down.

down = IsAutoLootKeyDown()

Arguments

none

Returns

down 

Boolean - Whether the autoloot key is down

Removed

This function was removed in 2.2.x. For backward compatibility or you'd rather not track down every single call to this function, just add this somewhere in the Lua file:

if not IsAutoLootKeyDown then
    function IsAutoLootKeyDown()
        return IsModifiedClick("AUTOLOOTTOGGLE")
    end
end