t.Errorf("e2t2_ssa(u)=(%v, %v) want (%v, %v)", got, ok, u, true)
	}
	if got, ok := e2t2_ssa(s); ok || got != nil {
		t.Errorf("e2t2_ssa(s)=(%v, %v) want (%v, %v)", got, ok, nil, false)
	}
}

func testAssertI2T2(t *testing.T) {
	if got, ok := i2t2_ssa(u); !ok || got != u {
		t.Errorf("i2t2_ssa(u)=(%v, %v) want (%v, %v)", got, ok, u, true)
	}
	if got, ok := i2t2_ssa(s); ok || got != nil {