You asked "what" not "which" :)

test test_codecs failed -- Traceback (most recent call last):
  File "/Users/jan/src/python-svn/Lib/test/test_codecs.py", line 531, in 
test_array
    codecs.readbuffer_encode(array.array("c", "spam")),
TypeError: must be string or read-only buffer, not array.array


test test_ioctl failed -- Traceback (most recent call last):
  File "/Users/jan/src/python-svn/Lib/test/test_ioctl.py", line 34, in 
test_ioctl_mutate
    r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, 1)
TypeError: ioctl requires a file or file descriptor, an integer and 
optionally an integer or buffer argument


test test_multiprocessing failed -- Traceback (most recent call last):
  File "/Users/jan/src/python-svn/Lib/test/test_multiprocessing.py", 
line 1269, in test_connection
    self.assertEqual(conn.send_bytes(arr), None)
TypeError: must be string or read-only buffer, not array.array


test test_socket failed -- errors occurred; run in verbose mode for 
details
(have to recheck)


test test_struct failed -- Traceback (most recent call last):
  File "/Users/jan/src/python-svn/Lib/test/test_struct.py", line 468, in 
test_unpack_with_buffer
    value, = struct.unpack('>I', data)
error: unpack requires a string argument of length 4