dummy_node zz [dummy_node zz] . (bool_expr.Binary left:(word value:left) right:(word value:right)) (bool_expr.Binary left:(word value:left) right:(word value:right)) .len(li) = 1000 len(words) = 200 CompoundWord 100, String 100 .len = 0 len = 2 [(arith_expr.NoOp) (arith_expr.Const i:42)] . Total: 4 tests (1886 ticks, 0.002 sec), 1009 assertions Pass: 4, fail: 0, skip: 0.