Re: Interesting stack overflow in Lua 5.3

[Tim Hill <drtimhill@...>]

On Sep 3, 2015, at 11:12 AM, Sean Conner <sean@conman.org> wrote:

The following function, when invoked, causes a C stack overflow
in Lua 5.3.

local subsystem_mt = {__index =
  function(spec,auction)
     for key,bid in ipairs(spec) do
        print("Checking '"..auction.."' against '"..key.."'")
     end
  end}

I may be missing something, but "The following function" does not seem
to be a function. It looks like a table... (Therefore, I do not know
how to invoke it to cause something.)

 All I did was take that code, then add

x = setmetatable({},subsystem_mt)
print(x.one)

Isn’t this expected behavior? Since ipairs() respects metamethods (since 5.3), looks like you have an infinite recursion (if you don’t have an item at key 1)?

—Tim