lua-users home
lua-l archive

[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index] [Thread Index]

2013/5/10 Bernd Eggink <>:
> I've just been struggling with a bug that caused my program to go into an
> infinite loop at a certain point for no obvious reason. As I'm in the habit
> of starting each source with "require strict", I didn't expect it to be
> something as simple as the usage of an undefined (and undeclared) global. I
> use the module from
> It happens in the __index metafunction, which is defined like this:
> mt.__index = function (t, n)
>   if not mt.__declared[n] and debug.getinfo(2, "S").what ~= "C" then
>      error("variable '"..n.."' is not declared", 2)
>   end
>   return rawget(t, n)
> end
> The baffling fact is that the function 'error' from the standard library
> loops and eats up 100% CPU, instead of aborting the program. If the line is
> replaced by os.exit(1), the program halts immediately.

`error` is local, I hope?