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local function f(...)
    print(#{...})
end
f("A","B","C")

works fine and prints 3 (at the cost of creating a temporary table)
Which is very expensive, but then again if you need the length you likely need to index them using a table anyway. 

I've always liked the apairs() suggestion:

for i,a in apairs(...) do
 print(a)
end
Bit cheaper then a table, easy to implement, easy to understand and, like a table, grows linearly with each added element. And, unlike a table, it can handle nils just fine. 

I'd like to see it become part of baselib in 5.2.
- Alex