@Test public void txn_continue_1() {

    Txn.executeWrite(counter, ()->counter.set(91)) ;
    
    Txn.executeWrite(counter, ()-> {
        assertEquals("In txn, value()", 91, counter.value()) ;
        assertEquals("In txn, read()", 91, counter.read()) ;
        counter.inc(); 
        Txn.executeWrite(counter, ()->{
            assertEquals("In txn, value()", 91, counter.value()) ;
            assertEquals("In txn, get()", 92, counter.read()) ;
            }) ;
        });
    assertEquals(92,counter.value()) ;
}