current line number in Lua

Does Lua support something like C’s __LINE__ macro, which returns the number of the current code line? I know Lua has a special built-in variable called _G, but I don’t see line number in there…

How do I make a 2D array in Lua?

How can I make a 2D array with Lua? I need to dynamically create this.

local tbl = { { } }
Something like the above but where I can specify how many items. In my case they’ll be the same amount. I …