Traceback when trying to parse except handler with invalid exception type

[wvffle]

I just ran into a problem where I made a typo and did:

try:
    # ...
except (MyException, NotImplemented):
    pass

As you can clearly see, it should be NotImplementedError but instead of telling me that, bugbear did traceback:

Traceback (most recent call last):
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/bin/flake8", line 8, in <module>
    sys.exit(main())
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/flake8/main/cli.py", line 22, in main
    app.run(argv)
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/flake8/main/application.py", line 360, in run
    self._run(argv)
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/flake8/main/application.py", line 348, in _run
    self.run_checks()
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/flake8/main/application.py", line 262, in run_checks
    self.file_checker_manager.run()
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/flake8/checker.py", line 334, in run
    self.run_serial()
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/flake8/checker.py", line 318, in run_serial
    checker.run_checks()
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/flake8/checker.py", line 598, in run_checks
    self.run_ast_checks()
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/flake8/checker.py", line 505, in run_ast_checks
    for (line_number, offset, text, _) in runner:
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/bugbear.py", line 36, in run
    visitor.visit(self.tree)
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/bugbear.py", line 156, in visit
    super().visit(node)
  File "/usr/lib/python3.8/ast.py", line 363, in visit
    return visitor(node)
  File "/usr/lib/python3.8/ast.py", line 371, in generic_visit
    self.visit(item)
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/bugbear.py", line 156, in visit
    super().visit(node)
  File "/usr/lib/python3.8/ast.py", line 363, in visit
    return visitor(node)
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/bugbear.py", line 288, in visit_ClassDef
    self.generic_visit(node)
  File "/usr/lib/python3.8/ast.py", line 371, in generic_visit
    self.visit(item)
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/bugbear.py", line 156, in visit
    super().visit(node)
  File "/usr/lib/python3.8/ast.py", line 363, in visit
    return visitor(node)
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/bugbear.py", line 278, in visit_AsyncFunctionDef
    self.generic_visit(node)
  File "/usr/lib/python3.8/ast.py", line 371, in generic_visit
    self.visit(item)
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/bugbear.py", line 156, in visit
    super().visit(node)
  File "/usr/lib/python3.8/ast.py", line 363, in visit
    return visitor(node)
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/bugbear.py", line 269, in visit_For
    self.generic_visit(node)
 File "/usr/lib/python3.8/ast.py", line 371, in generic_visit
    self.visit(item)
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/bugbear.py", line 156, in visit
    super().visit(node)
  File "/usr/lib/python3.8/ast.py", line 363, in visit
    return visitor(node)
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/bugbear.py", line 292, in visit_Try
    self.generic_visit(node)
  File "/usr/lib/python3.8/ast.py", line 371, in generic_visit
    self.visit(item)
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/bugbear.py", line 156, in visit
    super().visit(node)
  File "/usr/lib/python3.8/ast.py", line 363, in visit
    return visitor(node)
  File "/root/.cache/pre-commit/repo66mtzu3l/py_env-python3.8/lib/python3.8/site-packages/bugbear.py", line 185, in visit_ExceptHandler
    if issubclass(
TypeError: issubclass() arg 2 must be a class or tuple of classes

[ambv]

Good catch, we'll fix it.