addattribute bug

[Simon Glover]

 This code:

    newclass P1, "Foo"
    subclass P2, P1, "Bar"
    addattribute P2, "bar_i"
    print "ok 2\n"
    end

 barfs with:

   SArray index out of bounds!

 Is this a bug or just something that hasn't been implemented yet?

 Simon