function setm(tbl)
	local meta = {
		__newindex = function(t, k, v);
			if type(v) == 'table' then
				tbl[k] = setm(v);
			end;
		end;
		__index = function(t, k)
			if k == 'meta' then
				return function(self)
					if self ~= tbl then
						return error('Attempted to call a method as a function', 0);
					end;
					return getmetatable(tbl) or meta;
				end;
			end;
		end;
	};
	
	return setmetatable(tbl, meta);
end;

local env = setmetatable({ }, {
	__index = function(t, k)
		if type(k) == 'table' then
			return k, k:meta();
		end;
	end;
	
	__newindex = function(t, k, v)
		if type(v) == 'table' then
			getfenv(0)[k] = setm(v);
		end;
	end;
});

setfenv(1, env);

a = {
	b = { };
};

print(a, a.b);