[Python-projects] PyLint crash

[Maarten ter Huurne]

Hi,

If I feed the following program to PyLint:
===
def f(g = lambda: None):
        g().x
===
It crashes on the statement "i = self.argnames.index(argname)" in ASTNG, 
because "argname" does not exist in "self.argnames".

This error happens with rpython disabled, but it is very similar to three 
other errors I got with rpython enabled, so I think that enabling rpython 
increases the chance of triggering this bug because of the additional type 
information that becomes available.

Here is the full log:
===
$ pylint --version
No config file found, using default configuration
pylint 0.13.1,
astng 0.17.0, common 0.21.2
Python 2.4.3 (#2, Oct  6 2006, 07:52:30)
[GCC 4.0.3 (Ubuntu 4.0.3-1ubuntu5)]
$ pylint -rn testcase2.py
No config file found, using default configuration
************* Module testcase2
W:  2: Found indentation with tabs instead of spaces
C:  1: Missing docstring
C:  1:f: Invalid name "f" (should match [a-z_][a-z0-9_]{2,30}$)
C:  1:f: Missing docstring
C:  1:f: Invalid name "g" (should match [a-z_][a-z0-9_]{2,30}$)
W:  2:f: Statement seems to have no effect
Traceback (most recent call last):
  File "/usr/bin/pylint", line 4, in ?
    lint.Run(sys.argv[1:])
  File "/usr/lib/python2.4/site-packages/pylint/lint.py", line 890, in 
__init__
    linter.check(args)
  File "/usr/lib/python2.4/site-packages/pylint/lint.py", line 496, in 
check
    self.check_file(filepath, modname, checkers)
  File "/usr/lib/python2.4/site-packages/pylint/lint.py", line 513, in 
check_file
    astng = self._check_file(filepath, modname, checkers)
  File "/usr/lib/python2.4/site-packages/pylint/lint.py", line 537, in 
_check_file
    if not self.check_astng_module(astng, checkers):
  File "/usr/lib/python2.4/site-packages/pylint/lint.py", line 598, in 
check_astng_module
    self.astng_events(astng, [checker for checker in checkers
  File "/usr/lib/python2.4/site-packages/pylint/lint.py", line 616, in 
astng_events
    self.astng_events(child, checkers, _reversed_checkers)
  File "/usr/lib/python2.4/site-packages/pylint/lint.py", line 616, in 
astng_events
    self.astng_events(child, checkers, _reversed_checkers)
  File "/usr/lib/python2.4/site-packages/pylint/lint.py", line 616, in 
astng_events
    self.astng_events(child, checkers, _reversed_checkers)
  File "/usr/lib/python2.4/site-packages/pylint/lint.py", line 616, in 
astng_events
    self.astng_events(child, checkers, _reversed_checkers)
  File "/usr/lib/python2.4/site-packages/pylint/lint.py", line 616, in 
astng_events
    self.astng_events(child, checkers, _reversed_checkers)
  File "/usr/lib/python2.4/site-packages/pylint/lint.py", line 613, in 
astng_events
    checker.visit(astng)
  File "/usr/lib/python2.4/site-packages/logilab/astng/utils.py", line 84, 
in visit
    method(node)
  File "/usr/lib/python2.4/site-packages/pylint/checkers/typecheck.py", 
line 93, in visit_getattr
    infered = list(node.expr.infer())
  File "/usr/lib/python2.4/site-packages/logilab/astng/inference.py", line 
45, in wrapped
    for res in _func(node, context, **kwargs):
  File "/usr/lib/python2.4/site-packages/logilab/astng/inference.py", line 
269, in infer_callfunc
    for callee in self.node.infer(context):
  File "/usr/lib/python2.4/site-packages/logilab/astng/inference.py", line 
45, in wrapped
    for res in _func(node, context, **kwargs):
  File "/usr/lib/python2.4/site-packages/logilab/astng/__init__.py", line 
122, in _infer_stmts
    for infered in stmt.infer(context):
  File "/usr/lib/python2.4/site-packages/logilab/astng/inference.py", line 
45, in wrapped
    for res in _func(node, context, **kwargs):
  File "/usr/lib/python2.4/site-packages/logilab/astng/inference.py", line 
194, in infer_function
    for infered in context.callcontext.infer_argument(self, name, 
context):
  File "/usr/lib/python2.4/site-packages/logilab/astng/inference.py", line 
45, in wrapped
    for res in _func(node, context, **kwargs):
  File "/usr/lib/python2.4/site-packages/logilab/astng/inference.py", line 
194, in infer_function
    for infered in context.callcontext.infer_argument(self, name, 
context):
  File "/usr/lib/python2.4/site-packages/logilab/astng/inference.py", line 
171, in infer_argument
    mularg = funcnode.mularg_class(name)
  File "/usr/lib/python2.4/site-packages/logilab/astng/scoped_nodes.py", 
line 391, in mularg_class
    i = self.argnames.index(argname)
ValueError: list.index(x): x not in list
===

Bye,
                Maarten
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