innodb.innodb                            [ fail ]
          Test ended at 2010-06-02 15:04:06
  
  CURRENT_TEST: innodb.innodb
  --- /usr/w/mysql-trunk-innodb/mysql-test/suite/innodb/r/innodb.result	2010-05-23 23:10:26.576407000 +0300
  +++ /usr/w/mysql-trunk-innodb/mysql-test/suite/innodb/r/innodb.reject	2010-06-02 15:04:05.000000000 +0300
  @@ -2648,7 +2648,7 @@
   create table t4 (s1 char(2) binary,primary key (s1)) engine=innodb;
   insert into t1 values (0x41),(0x4120),(0x4100);
   insert into t2 values (0x41),(0x4120),(0x4100);
  -ERROR 23000: Duplicate entry 'A\x00' for key 'PRIMARY'
  +ERROR 23000: Duplicate entry 'A' for key 'PRIMARY'
   insert into t2 values (0x41),(0x4120);

The change in the printout was introduced in:

  ------------------------------------------------------------
  revno: 3008.6.2
  revision-id: sergey.glukhov@sun.com-20100527160143-57nas8nplzpj26dz
  parent: sergey.glukhov@sun.com-20100527155443-24vqi9o8rpnkyci7
  committer: Sergey Glukhov <Sergey.Glukhov@sun.com>
  branch nick: mysql-trunk-bugfixing
  timestamp: Thu 2010-05-27 20:01:43 +0400
  message:
    Bug#52430 Incorrect key in the error message for duplicate key error involving BINARY type
    For BINARY(N) strip trailing zeroes to make the error message nice-looking
  
   @ mysql-test/r/errors.result
      test case
  
   @ mysql-test/r/type_binary.result
      result fix
  
   @ mysql-test/t/errors.test
      test case
  
   @ sql/key.cc
      For BINARY(N) strip trailing zeroes to make the error message nice-looking

and its author (Sergey) did not notice the test failure because that test
has been disabled in his tree.