[Kryso]

And this example would fail again, because there would be no "self" (or at least no valid self).

function Table:Foo( arg )
    self.bar= self.bar+ arg;
end

is just syntactic sugar for

Table.Foo = function( self, arg )
    self.bar = self.bar + arg;
end

and

Table:Foo( 1 );

is the same as

Table.Foo( Table, 1 );