IndexError: pop from empty list

[DethRaid]

Ran this on my code base. I handle dependencies as git submodules, so they're all in my working tree and cppclean ran on all of them. It spit out a bunch of warnings, then a stack trace:

Traceback (most recent call last):
  File "/usr/local/bin/cppclean", line 145, in <module>
    sys.exit(main())
  File "/usr/local/bin/cppclean", line 120, in main
    entire_ast = list([_f for _f in builder.generate() if _f])
  File "/usr/local/bin/cppclean", line 120, in <listcomp>
    entire_ast = list([_f for _f in builder.generate() if _f])
  File "/usr/local/lib/python3.5/dist-packages/cpp/ast.py", line 647, in generate
    if self.namespaces.pop():
IndexError: pop from empty list

[pgcrooks]

I'm seeing the same issue, with the same stack trace (although I'm on Python 3.6).

[regomatic]

I'm getting this issue as well, using Python 2.7, with a similar but longer stacktrace:

 File "c:\Python27\lib\runpy.py", line 174, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "c:\Python27\lib\runpy.py", line 72, in _run_code
    exec code in run_globals
  File "C:\Python27\Scripts\cppclean.py", line 145, in <module>
    sys.exit(main())
  File "C:\Python27\Scripts\cppclean.py", line 138, in main
    quiet=args.quiet):
  File "c:\Python27\lib\site-packages\cpp\find_warnings.py", line 597, in run
    hunter.find_warnings()
  File "c:\Python27\lib\site-packages\cpp\find_warnings.py", line 126, in find_warnings
    self._find_source_warnings()
  File "c:\Python27\lib\site-packages\cpp\find_warnings.py", line 542, in _find_source_warnings
    included_files, forward_declarations = self._read_and_parse_includes()
  File "c:\Python27\lib\site-packages\cpp\find_warnings.py", line 177, in _read_and_parse_includes
    module = self._get_module(node)
  File "c:\Python27\lib\site-packages\cpp\find_warnings.py", line 151, in _get_module
    ast_list = [_f for _f in builder.generate() if _f]
  File "c:\Python27\lib\site-packages\cpp\ast.py", line 651, in generate
    result = self._generate_one(token)
  File "c:\Python27\lib\site-packages\cpp\ast.py", line 675, in _generate_one
    return method()
  File "c:\Python27\lib\site-packages\cpp\ast.py", line 1177, in handle_class
    return self._handle_class_and_struct(Class)
  File "c:\Python27\lib\site-packages\cpp\ast.py", line 1174, in _handle_class_and_struct
    return self._get_class(class_type, None)
  File "c:\Python27\lib\site-packages\cpp\ast.py", line 1486, in _get_class
    body = list(ast.generate())
  File "c:\Python27\lib\site-packages\cpp\ast.py", line 651, in generate
    result = self._generate_one(token)
  File "c:\Python27\lib\site-packages\cpp\ast.py", line 675, in _generate_one
    return method()
  File "c:\Python27\lib\site-packages\cpp\ast.py", line 1180, in handle_struct
    return self._handle_class_and_struct(Struct)
  File "c:\Python27\lib\site-packages\cpp\ast.py", line 1174, in _handle_class_and_struct
    return self._get_class(class_type, None)
  File "c:\Python27\lib\site-packages\cpp\ast.py", line 1486, in _get_class
    body = list(ast.generate())
  File "c:\Python27\lib\site-packages\cpp\ast.py", line 647, in generate
    if self.namespaces.pop():
IndexError: pop from empty list

[Ede123]

Already fixed, likely by https://github.com/myint/cppclean/commit/4d695a63cd74f9fc434a4626430d6a353e6f7eba

[TomerJLevy]

Hi,

I installed using 'pip install --upgrade cppclean' with python 2.7.6 and I still got this error.

I saw that it was fixed on Github, but it installed an older version of 'ast.py' which doesn't contain the fix.

[StackDoubleFlow]

I am now receiving this error.

Traceback (most recent call last):
  File "/home/stack/.local/bin/cppclean", line 166, in <module>
    sys.exit(main())
  File "/home/stack/.local/bin/cppclean", line 155, in main
    if module.run(filename, source, entire_ast,
  File "/home/stack/.local/lib/python3.9/site-packages/cpp/find_warnings.py", line 633, in run
    hunter.find_warnings()
  File "/home/stack/.local/lib/python3.9/site-packages/cpp/find_warnings.py", line 129, in find_warnings
    self._find_source_warnings()
  File "/home/stack/.local/lib/python3.9/site-packages/cpp/find_warnings.py", line 575, in _find_source_warnings
    included_files, forward_declarations = self._read_and_parse_includes()
  File "/home/stack/.local/lib/python3.9/site-packages/cpp/find_warnings.py", line 182, in _read_and_parse_includes
    module = self._get_module(node)
  File "/home/stack/.local/lib/python3.9/site-packages/cpp/find_warnings.py", line 156, in _get_module
    ast_list = [_f for _f in builder.generate() if _f]
  File "/home/stack/.local/lib/python3.9/site-packages/cpp/find_warnings.py", line 156, in <listcomp>
    ast_list = [_f for _f in builder.generate() if _f]
  File "/home/stack/.local/lib/python3.9/site-packages/cpp/ast.py", line 675, in generate
    result = self._generate_one(token)
  File "/home/stack/.local/lib/python3.9/site-packages/cpp/ast.py", line 702, in _generate_one
    return method()
  File "/home/stack/.local/lib/python3.9/site-packages/cpp/ast.py", line 1440, in handle_template
    return self._get_class(Class,
  File "/home/stack/.local/lib/python3.9/site-packages/cpp/ast.py", line 1558, in _get_class
    body = list(ast.generate())
  File "/home/stack/.local/lib/python3.9/site-packages/cpp/ast.py", line 675, in generate
    result = self._generate_one(token)
  File "/home/stack/.local/lib/python3.9/site-packages/cpp/ast.py", line 702, in _generate_one
    return method()
  File "/home/stack/.local/lib/python3.9/site-packages/cpp/ast.py", line 1457, in handle_template
    return self.get_method(FUNCTION_NONE, templated_types)
  File "/home/stack/.local/lib/python3.9/site-packages/cpp/ast.py", line 947, in get_method
    return self._get_method(
  File "/home/stack/.local/lib/python3.9/site-packages/cpp/ast.py", line 994, in _get_method
    name = return_type_and_name.pop()
IndexError: pop from empty list

Installed today with pip install --upgrade cppclean

[DJMcMayhem]

I am getting the same error as StackDoubleFlow.

[DJMcMayhem]

OK, after some further investigation, it appears that this happens because of the spaceship operator. This is the line of code that causes cppclean to get tripped up for me:

    friend int operator<=>(const VersionNumber &a, const VersionNumber &b);