Error with trace.py

[Felix Wiemann]

$ cat test.py
print "Hello World!"
if 0:
    print "Never executed."
if 1:
    print "Hi."

$ python test.py
Hello World!
Hi.

$ python /usr/lib/python2.3/trace.py --count test.py
Hello World!
Hi.
trace: Could not open '/usr/lib/python2.3/threading.cover' for writing: [Errno 13] Permission denied: '/usr/lib/python2.3/threading.cover'- skipping
Traceback (most recent call last):
  File "/usr/lib/python2.3/trace.py", line 690, in ?
    main()
  File "/usr/lib/python2.3/trace.py", line 687, in main
    results.write_results(missing, summary=summary, coverdir=coverdir)
  File "/usr/lib/python2.3/trace.py", line 271, in write_results
    lnotab, count)
TypeError: unpack non-sequence

Why doesn't it work?

By the way, after running trace.py, there is a file test.cover in the
directory:

$ cat test.cover 
    1: print "Hello World!"
       if 0:
           print "Never executed."
    1: if 1:
    1:     print "Hi."

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