RuntimeError: 'ExceptHandler(...)' has non-Name name.

[ghost]

try:
    raise IOError(12, 'asdf')
except IOError as (errno, msg):
    print errno, msg

$ python2 --version
Python 2.7.11+
$ python2 asdf.py
12 asdf

$ mypy --version
mypy 0.521
$ mypy --show-traceback -2 asdf.py
asdf.py: error: INTERNAL ERROR -- please report a bug at https://github.com/python/mypy/issues version: 0.521
Traceback (most recent call last):
  File "/home/d/.local/bin/mypy", line 11, in <module>
    sys.exit(console_entry())
  File "/home/d/.local/lib/python3.5/site-packages/mypy/__main__.py", line 7, in console_entry
    main(None)
  File "/home/d/.local/lib/python3.5/site-packages/mypy/main.py", line 50, in main
    res = type_check_only(sources, bin_dir, options)
  File "/home/d/.local/lib/python3.5/site-packages/mypy/main.py", line 97, in type_check_only
    options=options)
  File "/home/d/.local/lib/python3.5/site-packages/mypy/build.py", line 196, in build
    graph = dispatch(sources, manager)
  File "/home/d/.local/lib/python3.5/site-packages/mypy/build.py", line 1793, in dispatch
    graph = load_graph(sources, manager)
  File "/home/d/.local/lib/python3.5/site-packages/mypy/build.py", line 1876, in load_graph
    root_source=True)
  File "/home/d/.local/lib/python3.5/site-packages/mypy/build.py", line 1440, in __init__
    self.parse_file()
  File "/home/d/.local/lib/python3.5/site-packages/mypy/build.py", line 1632, in parse_file
    self.ignore_all or self.options.ignore_errors)
  File "/usr/lib/python3.5/contextlib.py", line 77, in __exit__
    self.gen.throw(type, value, traceback)
  File "/home/d/.local/lib/python3.5/site-packages/mypy/build.py", line 1528, in wrap_context
    yield
  File "/home/d/.local/lib/python3.5/site-packages/mypy/build.py", line 1632, in parse_file
    self.ignore_all or self.options.ignore_errors)
  File "/home/d/.local/lib/python3.5/site-packages/mypy/build.py", line 571, in parse_file
    tree = parse(source, path, self.errors, options=self.options)
  File "/home/d/.local/lib/python3.5/site-packages/mypy/parse.py", line 31, in parse
    options=options)
  File "/home/d/.local/lib/python3.5/site-packages/mypy/fastparse2.py", line 95, in parse
    ).visit(ast)
  File "/home/d/.local/lib/python3.5/site-packages/typed_ast/ast27.py", line 255, in visit
    return visitor(node)
  File "/home/d/.local/lib/python3.5/site-packages/mypy/fastparse2.py", line 268, in visit_Module
    body = self.fix_function_overloads(self.translate_stmt_list(mod.body))
  File "/home/d/.local/lib/python3.5/site-packages/mypy/fastparse2.py", line 166, in translate_stmt_list
    stmt = self.visit(e)
  File "/home/d/.local/lib/python3.5/site-packages/typed_ast/ast27.py", line 255, in visit
    return visitor(node)
  File "/home/d/.local/lib/python3.5/site-packages/mypy/fastparse2.py", line 112, in wrapper
    node = f(self, ast)
  File "/home/d/.local/lib/python3.5/site-packages/mypy/fastparse2.py", line 559, in visit_TryExcept
    return self.try_handler(n.body, n.handlers, n.orelse, [], n.lineno)
  File "/home/d/.local/lib/python3.5/site-packages/mypy/fastparse2.py", line 582, in try_handler
    vs = [produce_name(h) for h in handlers]
  File "/home/d/.local/lib/python3.5/site-packages/mypy/fastparse2.py", line 582, in <listcomp>
    vs = [produce_name(h) for h in handlers]
  File "/home/d/.local/lib/python3.5/site-packages/mypy/fastparse2.py", line 580, in produce_name
    raise RuntimeError("'{}' has non-Name name.".format(ast27.dump(item)))
RuntimeError: 'ExceptHandler(type=Name(id='IOError', ctx=Load()), name=Tuple(elts=[Name(id='errno', ctx=Store()), Name(id='msg', ctx=Store())], ctx=Store()), body=[Print(dest=None, values=[Name(id='errno', ctx=Load()), Name(id='msg', ctx=Load())], nl=True)])' has non-Name name.
asdf.py: note: use --pdb to drop into pdb

[gvanrossum]

FWIW this syntax is no longer supported in Python 3 (and I have never before seen in in Python 2 :-).

[ilevkivskyi]

FWIW this syntax is no longer supported in Python 3 (and I have never before seen in in Python 2 :-).

I think in any case it is better to give a normal error and not crash.

[gvanrossum]

OK have a look at #4011. If this is acceptable I'll add some tests.