autocommit does not display rollback

set autocommit on feedback on echo on
does display the comment, the dml result, and the commit result. In case of rollback, there is no message

SQL> CREATE TABLE T(X NUMBER PRIMARY KEY)
Table created.
SQL> ALTER TABLE T ADD CONSTRAINT C0 CHECK (X < 2) DEFERRABLE INITIALLY DEFERRED
Table altered.
SQL> SET AUTOCOMMIT ON
SQL> INSERT INTO T VALUES (1)
1 row created.
Commit complete.
SQL> UPDATE T SET X=2
1 row updated.

The error message

ORA-02091: transaction rolled back
ORA-02290: check constraint (SCOTT.C0) violated

is missing