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%!test <*35881>
%! global _tstvar_;  # Final test does "clear all" which removes this var.
%!
%! _tstvar_ = struct ("init1",-1, "a1",-1, "init2",-1, "a2",-1);
%! bug35881 (0);
%! assert (_tstvar_, struct ("init1",true, "a1",1, "init2",false, "a2",1));
%! clear -f bug35881
%!
%! _tstvar_ = struct ("init1",-1, "a1",-1, "init2",-1, "a2",-1);
%! bug35881 (1);
%! assert (_tstvar_, struct ("init1",true, "a1",1, "init2",false, "a2",1));
%!
%! _tstvar_ = struct ("init1",-1, "a1",-1, "init2",-1, "a2",-1);
%! fail ("bug35881 (2)", "'a' undefined near line");