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%!test
%! a = class_bug44940 ();
%! b = a;
%! c = a ();
%! a.child = 100;
%! assert (a.child, b.child);
%! assert (a.child, c.child);
%! c.child = 500;
%! assert (a.child, b.child);
%! assert (a.child, c.child);