rror-6a.js fails to instantiate because it
    // requests a name from instantion-error-6b.js that is ambiguous there.
    // instantiation-error-6b.js itself, however, is fine, and it instantiates
    // and evaluates successfully.
    window.addEventListener("load", test_load.step_func_done(ev => {
      const exn = log[0];
      assert_array_equals(log, [
          exn, 1,
          "instantiation-error-6c",
          "instantiation-error-6d",
          "instantiation-error-6b", 2
      ]);
      assert_