AttributeError: 'arg' object has no attribute 'scope'

[asottile]

Steps to reproduce

here's a minimal case

class D:
    @staticmethod
    def g(
        x  # type: np.array
    ):
        pass

D.g(1)

Current behavior

$ pylint x.py --py3k
Traceback (most recent call last):
  File "/tmp/x/venv/lib/python3.6/site-packages/pylint/lint.py", line 1212, in get_ast
    return MANAGER.ast_from_file(filepath, modname, source=True)
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/manager.py", line 94, in ast_from_file
    return AstroidBuilder(self).file_build(filepath, modname)
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/builder.py", line 136, in file_build
    return self._post_build(module, encoding)
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/builder.py", line 160, in _post_build
    module = self._manager.visit_transforms(module)
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/manager.py", line 72, in visit_transforms
    return self._transform.visit(node)
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/transforms.py", line 89, in visit
    module.body = [self._visit(child) for child in module.body]
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/transforms.py", line 89, in <listcomp>
    module.body = [self._visit(child) for child in module.body]
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/transforms.py", line 54, in _visit
    visited = self._visit_generic(value)
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/transforms.py", line 61, in _visit_generic
    return [self._visit_generic(child) for child in node]
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/transforms.py", line 61, in <listcomp>
    return [self._visit_generic(child) for child in node]
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/transforms.py", line 67, in _visit_generic
    return self._visit(node)
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/transforms.py", line 54, in _visit
    visited = self._visit_generic(value)
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/transforms.py", line 67, in _visit_generic
    return self._visit(node)
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/transforms.py", line 54, in _visit
    visited = self._visit_generic(value)
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/transforms.py", line 61, in _visit_generic
    return [self._visit_generic(child) for child in node]
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/transforms.py", line 61, in <listcomp>
    return [self._visit_generic(child) for child in node]
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/transforms.py", line 67, in _visit_generic
    return self._visit(node)
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/transforms.py", line 57, in _visit
    return self._transform(node)
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/transforms.py", line 39, in _transform
    if predicate is None or predicate(node):
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/brain/brain_numpy_utils.py", line 55, in looks_like_numpy_member
    and _is_a_numpy_module(node.expr)
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/brain/brain_numpy_utils.py", line 32, in _is_a_numpy_module
    x for x in node.lookup(module_nickname)[1] if isinstance(x, astroid.Import)
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/node_classes.py", line 1061, in lookup
    return self.scope().scope_lookup(self, name)
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/node_classes.py", line 499, in scope
    return self.parent.scope()
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/node_classes.py", line 499, in scope
    return self.parent.scope()
  File "/tmp/x/venv/lib/python3.6/site-packages/astroid/node_classes.py", line 499, in scope
    return self.parent.scope()
AttributeError: 'arg' object has no attribute 'scope'

Expected behavior

Anything but crash

pylint --version output

$ pylint --version
pylint 2.4.2
astroid 2.3.1
Python 3.6.8 (default, Jan 14 2019, 11:02:34) 
[GCC 8.0.1 20180414 (experimental) [trunk revision 259383]]

[asottile]

The workaround for now is to request pylint<2.4 and astroid<2.3

[PCManticore]

Thanks for reporting the issue @asottile ! It's fixed in astroid, I'll release it shortly as 2.3.2.