$ tmp=`mktemp /tmp/foo.XXXXXXXXXX`; echo 'def foo: pass' > $tmp; python3 -m pdb $tmp; rm $tmp
Traceback (most recent call last):
  File "/usr/local/lib/python3.2/pdb.py", line 1556, in main
    pdb._runscript(mainpyfile)
  File "/usr/local/lib/python3.2/pdb.py", line 1437, in _runscript
    self.run(statement)
  File "/usr/local/lib/python3.2/bdb.py", line 392, in run
    exec(cmd, globals, locals)
  File "<string>", line 1, in <module>
  File "/tmp/foo.iLhPYHBZrF", line 1
    def foo: pass
           ^
SyntaxError: invalid syntax
Uncaught exception. Entering post mortem debugging
Running 'cont' or 'step' will restart the program
> <string>(1)<module>()
(Pdb) quit
Post mortem debugger finished. The /tmp/foo.iLhPYHBZrF will be restarted
Traceback (most recent call last):
  File "/usr/local/lib/python3.2/pdb.py", line 1556, in main
    pdb._runscript(mainpyfile)
  File "/usr/local/lib/python3.2/pdb.py", line 1437, in _runscript
    self.run(statement)
  File "/usr/local/lib/python3.2/bdb.py", line 392, in run
    exec(cmd, globals, locals)
  File "<string>", line 1, in <module>
  File "/tmp/foo.iLhPYHBZrF", line 1
    def foo: pass
           ^
SyntaxError: invalid syntax
Uncaught exception. Entering post mortem debugging
Running 'cont' or 'step' will restart the program
> <string>(1)<module>()
(Pdb) --KeyboardInterrupt--
(Pdb)

This continues to be a problem on Python-3.3.0

See how this is fixed at
http://code.google.com/p/pdb-clone/source/detail?r=0d4d905c6e0aa9c47611dbae514d3f7f53776dcb

Reported again in #24957

Xavier, your link is out of date.

Simple fix attached.  I copied the exit code from this part of the 'while True:' loop.

        try:
            pdb._runscript(mainpyfile)
            if pdb._user_requested_quit:
                break
            print("The program finished and will be restarted")

I am not sure if the conditional is still needed there.

Xavier, if you have a better patch, please upload it.

Slightly better in that pdb exits in case of a syntax error instead of proposing to restart the program which does not make sense.

A test case is included.

New changeset 26c4db1a0aea by Terry Jan Reedy in branch '2.7':
Issue #16180: Exit pdb if file has syntax error, instead of trapping user
https://hg.python.org/cpython/rev/26c4db1a0aea

New changeset 2d4aac2ab253 by Terry Jan Reedy in branch '3.4':
Issue #16180: Exit pdb if file has syntax error, instead of trapping user
https://hg.python.org/cpython/rev/2d4aac2ab253