[ python-Bugs-1595594 ] parser module bug for nested try...except statements

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Bugs item #1595594, was opened at 2006-11-13 14:00
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Category: Python Library
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Kay Schluehr (schluehrk)
Assigned to: Nobody/Anonymous (nobody)
Summary: parser module bug for nested try...except statements

Initial Comment:
The following block of source code causes an exception 
when tried to parse, listify and restoring an ast 
object:

source = """
try:
    try:
        TRY_BLOCK
    except EXC1:
        EXC_BLOCK1
    except EXC2:
        EXC_BLOCK1
except EXC3:
    FIN_BLOCK
"""

import parser
stlist = parser.suite(source).tolist()  # o.k.
parser.sequence2st(stlist)

Traceback (most recent call last):
  File "<interactive input>", line 1, in ?
ParserError: Expected node type 297, got -31392.

The node value -31392 is at random and not 
reproducable. 

The problem does not occur when only one except branch 
in the inner try is used:

source = """
try:
    try:
        TRY_BLOCK
    except EXC1:
        EXC_BLOCK1
except EXC3:
    FIN_BLOCK
"""

import parser
stlist = parser.suite(source).tolist()  # o.k.
parser.sequence2st(stlist) # o.k.

It also doesn't occur for an outer finally-clause 
instead of an except clause.

The problem is reproducable for Python 2.5



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