Fatal error for variant of W0632 (unbalanced-tuple-unpacking): Crash list index out of range

[jpy-git]

Bug description

When parsing the following file:

x, y = (1, 2, 3) # This case of W0632 (unbalanced-tuple-unpacking) works fine
x, y, z = (1, 2) # This case causes fatal error!

pylint crashed with a IndexError and with the following stacktrace:

Traceback (most recent call last):
  File "/Users/joe/repos/pylint/pylint/lint/pylinter.py", line 1111, in _check_files
    self._check_file(get_ast, check_astroid_module, file)
  File "/Users/joe/repos/pylint/pylint/lint/pylinter.py", line 1146, in _check_file
    check_astroid_module(ast_node)
  File "/Users/joe/repos/pylint/pylint/lint/pylinter.py", line 1298, in check_astroid_module
    retval = self._check_astroid_module(
  File "/Users/joe/repos/pylint/pylint/lint/pylinter.py", line 1345, in _check_astroid_module
    walker.walk(node)
  File "/Users/joe/repos/pylint/pylint/utils/ast_walker.py", line 76, in walk
    self.walk(child)
  File "/Users/joe/repos/pylint/pylint/utils/ast_walker.py", line 76, in walk
    self.walk(child)
  File "/Users/joe/repos/pylint/pylint/utils/ast_walker.py", line 76, in walk
    self.walk(child)
  File "/Users/joe/repos/pylint/pylint/utils/ast_walker.py", line 73, in walk
    callback(astroid)
  File "/Users/joe/repos/pylint/pylint/checkers/base/name_checker/checker.py", line 390, in visit_assignname
    assign_type.value.elts[node.parent.elts.index(node)]
IndexError: list index out of range

Configuration

No response

Command used

pylint test.py

Pylint output

See traceback above

Expected behavior

Should be detected as another variant of W0632

Pylint version

pylint 2.14.0-dev0
astroid 2.11.0
Python 3.9.10 (main, Jan 15 2022, 11:40:53) 
[Clang 13.0.0 (clang-1300.0.29.3)]

OS / Environment

Mac OS Monterey

Additional dependencies

No response