setting a bp on current function, Pdb stops at next line although no bp

[490c593f-f636-409f-bb35-6abeb38a4595]

BPO	14792
Nosy	@birkenfeld, @xdegaye
Files	pdb_default.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields: ```python assignee = None closed_at = None created_at = labels = ['type-bug', 'library'] title = 'setting a bp on current function, Pdb stops at next line although no bp' updated_at = user = 'https://github.com/xdegaye' ``` bugs.python.org fields: ```python activity = actor = 'xdegaye' assignee = 'none' closed = False closed_date = None closer = None components = ['Library (Lib)'] creation = creator = 'xdegaye' dependencies = [] files = ['25553'] hgrepos = [] issue_num = 14792 keywords = ['patch'] message_count = 2.0 messages = ['160489', '161572'] nosy_count = 2.0 nosy_names = ['georg.brandl', 'xdegaye'] pr_nums = [] priority = 'normal' resolution = None stage = None status = 'open' superseder = None type = 'behavior' url = 'https://bugs.python.org/issue14792' versions = ['Python 2.7', 'Python 3.2', 'Python 3.3'] ```

[490c593f-f636-409f-bb35-6abeb38a4595]

Setting a breakpoint on a function from within that functions makes pdb to stop at the following line (where no breakpoint is set) after a continue command. In the following test pdb stops at line 3 where there is no breakpoint.

=== main.py \=================================

def foo():
    x = 1
    x = 2

foo()

=================================================

$ python -m pdb main.py
> /path_to/main.py(1)<module>()
-> def foo():
(Pdb) import sys; print(sys.version)
3.3.0a3+ (default:4e9680570be8, May 11 2012, 12:09:15) 
[GCC 4.3.2]
(Pdb) break 2
Breakpoint 1 at /path_to/main.py:2
(Pdb) continue
> /path_to/main.py(2)foo()
-> x = 1
(Pdb) break foo
Breakpoint 2 at /path_to/main.py:1
(Pdb) continue
> /path_to/main.py(3)foo()
-> x = 2
(Pdb) where
  /home/xavier/src/cpython/cpython-hg-default/Lib/bdb.py(405)run()
-> exec(cmd, globals, locals)
  <string>(1)<module>()
  /path_to/main.py(5)<module>()
-> foo()
> /path_to/main.py(3)foo()
-> x = 2
(Pdb) quit

=================================================

The attached patch fixes the problem. The patch includes a test case.

[490c593f-f636-409f-bb35-6abeb38a4595]

Parsing the modules source seems a better way to fix this problem, see bpo-14913.

[gaogaotiantian]

This is already fixed as the breakpoint on functions already uses source parsing.