RE: Interesting stack overflow in Lua 5.3

>> 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.)

> But I don't see how invoking it would cause something, either.

Add: setmetatable({1,2,3}, subsystem_mt).foo()

Lua 5.2 prints:

Checking 'foo' against '1'
Checking 'foo' against '2'
Checking 'foo' against '3'
metaindex.lua:7: attempt to call field 'foo' (a nil value)

But Lua 5.3 prints:

Checking 'foo' against '1'
Checking 'foo' against '2'
Checking 'foo' against '3'
Checking '4' against '1'
Checking '4' against '2'
Checking '4' against '3'
...last three lines are repeated...
metaindex.lua:3: C stack overflow

Paul.