Crash with "AssertionError: Should never get here in normal mode"

[pradyunsg]

🐛 Python 3.6.5, mypy 0.610

Reproducible on https://github.com/pypa/pip master. Running tox -e mypy on that repo a second time or later, results in an error the second time.

mypy configuration:

[mypy]
follow_imports = silent
ignore_missing_imports = True
strict_optional = False

[mypy-pip/_vendor/*]
follow_imports = skip
ignore_errors = True

mypy output/traceback:

mypy runtests: commands[0] | mypy src/pip
Traceback (most recent call last):
  File "/Users/pradyunsg/Projects/pip/.tox/mypy/bin/mypy", line 11, in <module>
    sys.exit(console_entry())
  File "/Users/pradyunsg/Projects/pip/.tox/mypy/lib/python3.6/site-packages/mypy/__main__.py", line 7, in console_entry
    main(None)
  File "/Users/pradyunsg/Projects/pip/.tox/mypy/lib/python3.6/site-packages/mypy/main.py", line 91, in main
    res = type_check_only(sources, bin_dir, options, flush_errors, fscache)  # noqa
  File "/Users/pradyunsg/Projects/pip/.tox/mypy/lib/python3.6/site-packages/mypy/main.py", line 148, in type_check_only
    fscache=fscache)
  File "/Users/pradyunsg/Projects/pip/.tox/mypy/lib/python3.6/site-packages/mypy/build.py", line 185, in build
    flush_errors, fscache)
  File "/Users/pradyunsg/Projects/pip/.tox/mypy/lib/python3.6/site-packages/mypy/build.py", line 285, in _build
    graph = dispatch(sources, manager)
  File "/Users/pradyunsg/Projects/pip/.tox/mypy/lib/python3.6/site-packages/mypy/build.py", line 2398, in dispatch
    process_graph(graph, manager)
  File "/Users/pradyunsg/Projects/pip/.tox/mypy/lib/python3.6/site-packages/mypy/build.py", line 2684, in process_graph
    process_fresh_modules(graph, prev_scc, manager)
  File "/Users/pradyunsg/Projects/pip/.tox/mypy/lib/python3.6/site-packages/mypy/build.py", line 2770, in process_fresh_modules
    graph[id].fix_cross_refs()
  File "/Users/pradyunsg/Projects/pip/.tox/mypy/lib/python3.6/site-packages/mypy/build.py", line 1853, in fix_cross_refs
    self.options.use_fine_grained_cache)
  File "/Users/pradyunsg/Projects/pip/.tox/mypy/lib/python3.6/site-packages/mypy/fixup.py", line 25, in fixup_module
    node_fixer.visit_symbol_table(tree.names)
  File "/Users/pradyunsg/Projects/pip/.tox/mypy/lib/python3.6/site-packages/mypy/fixup.py", line 95, in visit_symbol_table
    self.visit_type_info(value.node)
  File "/Users/pradyunsg/Projects/pip/.tox/mypy/lib/python3.6/site-packages/mypy/fixup.py", line 48, in visit_type_info
    base.accept(self.type_fixer)
  File "/Users/pradyunsg/Projects/pip/.tox/mypy/lib/python3.6/site-packages/mypy/types.py", line 512, in accept
    return visitor.visit_instance(self)
  File "/Users/pradyunsg/Projects/pip/.tox/mypy/lib/python3.6/site-packages/mypy/fixup.py", line 156, in visit_instance
    inst.type = lookup_qualified_typeinfo(self.modules, type_ref, self.quick_and_dirty)
  File "/Users/pradyunsg/Projects/pip/.tox/mypy/lib/python3.6/site-packages/mypy/fixup.py", line 246, in lookup_qualified_typeinfo
    assert quick_and_dirty, "Should never get here in normal mode"
AssertionError: Should never get here in normal mode
ERROR: InvocationError for command '/Users/pradyunsg/Projects/pip/.tox/mypy/bin/mypy src/pip' (exited with code 1)

[pradyunsg]

Following a similar, older report (#3852), attached is a zip of the .mypy_cache: mypy_cache.zip

[emmatyping]

Confirmed on mypy master.

[pradyunsg]

Reproduced on master as:

$ # in a clean venv, activated
$ python3 -m pip install -U git+git://github.com/python/mypy.git 
[...]
$ git clone https://github.com/pypa/pip.git --depth=1
[...]
$ cd pip
$ git fetch origin 13a749de24448d553b73abbb119d6a9e42531089
$ git checkout 13a749de24448d553b73abbb119d6a9e42531089
$ mypy src
[...]
$ mypy src
Traceback (most recent call last):
  File "/tmp/mypy-venv/bin/mypy", line 11, in <module>
    sys.exit(console_entry())
  File "/tmp/mypy-venv/lib/python3.6/site-packages/mypy/__main__.py", line 7, in console_entry
    main(None)
  File "/tmp/mypy-venv/lib/python3.6/site-packages/mypy/main.py", line 91, in main
    res = type_check_only(sources, bin_dir, options, flush_errors, fscache)  # noqa
  File "/tmp/mypy-venv/lib/python3.6/site-packages/mypy/main.py", line 148, in type_check_only
    fscache=fscache)
  File "/tmp/mypy-venv/lib/python3.6/site-packages/mypy/build.py", line 181, in build
    flush_errors, fscache)
  File "/tmp/mypy-venv/lib/python3.6/site-packages/mypy/build.py", line 286, in _build
    graph = dispatch(sources, manager)
  File "/tmp/mypy-venv/lib/python3.6/site-packages/mypy/build.py", line 2440, in dispatch
    process_graph(graph, manager)
  File "/tmp/mypy-venv/lib/python3.6/site-packages/mypy/build.py", line 2726, in process_graph
    process_fresh_modules(graph, prev_scc, manager)
  File "/tmp/mypy-venv/lib/python3.6/site-packages/mypy/build.py", line 2812, in process_fresh_modules
    graph[id].fix_cross_refs()
  File "/tmp/mypy-venv/lib/python3.6/site-packages/mypy/build.py", line 1895, in fix_cross_refs
    self.options.use_fine_grained_cache)
  File "/tmp/mypy-venv/lib/python3.6/site-packages/mypy/fixup.py", line 25, in fixup_module
    node_fixer.visit_symbol_table(tree.names)
  File "/tmp/mypy-venv/lib/python3.6/site-packages/mypy/fixup.py", line 95, in visit_symbol_table
    self.visit_type_info(value.node)
  File "/tmp/mypy-venv/lib/python3.6/site-packages/mypy/fixup.py", line 48, in visit_type_info
    base.accept(self.type_fixer)
  File "/tmp/mypy-venv/lib/python3.6/site-packages/mypy/types.py", line 513, in accept
    return visitor.visit_instance(self)
  File "/tmp/mypy-venv/lib/python3.6/site-packages/mypy/fixup.py", line 156, in visit_instance
    inst.type = lookup_qualified_typeinfo(self.modules, type_ref, self.quick_and_dirty)
  File "/tmp/mypy-venv/lib/python3.6/site-packages/mypy/fixup.py", line 246, in lookup_qualified_typeinfo
    assert quick_and_dirty, "Should never get here in normal mode"
AssertionError: Should never get here in normal mode

[pradyunsg]

Removing .mypy_cache after the first run, prevents this from occurring.

[ilevkivskyi]

I really hoped we will not see this ever again :-( Just to clarify, is this a regression in 0.610 (i.e. does it work with mypy 0.600)?

Also, could you please try to play with mypy config to see what exactly causes a breakage? Ideally it would be great to have a minimalistic repro, but I understand this may be hard to find.

[pradyunsg]

No crash with mypy 0.600.

Also, it no longer occurs on pip's master; I added a missing stub for a vendored library, which seems to have fixed this. It does still occur on pypa/pip@13a749d. Updated the reproduction case above to checkout to that.

[pradyunsg]

Is there any way to know which file mypy is processing when it crashes? I have a gut feeling it's going to be appdirs.py in src/pip/_vendor/. :P

Minimal reproduction mypy config, with the same source tree.

[mypy-pip/_vendor/*]
ignore_errors = True

[ilevkivskyi]

Is there any way to know which file mypy is processing when it crashes?

You can run mypy with -v (There is also -vv but it is extremely verbose).

[pradyunsg]

• mypy 0.600 also crashes with the minimal configuration but not with the configuration in OP.
• Both 0.600 and 0.610 do not crash with defaults -- i.e. an empty configuration file.

---

The crash still occurs on mypy 0.600 and 0.610 with the source tree reduced to (the minimal configuration):

.
├── setup.cfg
└── src
    └── pip
        ├── __init__.py
        ├── _internal
        │   ├── __init__.py
        │   └── configuration.py
        └── _vendor
            ├── __init__.py
            └── urllib3
                ├── __init__.py
                └── util
                    ├── __init__.py
                    └── url.py

6 directories, 9 files

All the __init__.py files are empty. Moving url.py to _vendor and deleting the urllib3 folder (which now only has empty __init__.py) files, still crashes. Moving it out of _vendor resolves the crash. :/

[pradyunsg]

Here's the smallest reproduction case I can come up with (crashes both 0.600 and 0.610):

tree .

.
├── setup.cfg
└── src
    ├── ignored
    │   ├── __init__.py
    │   └── two.py
    └── one.py

2 directories, 4 files

__init__.py is an empty file.

one.py

import logging

def func(value):
    # type: (Any) -> None
    pass

two.py

from collections import namedtuple


class MyClass(namedtuple('MyClass', undefined_variable)):
    pass

setup.cfg

[mypy-ignored/*]
ignore_errors = True

---

Things that prevent the crash:

• Adding from typing import Any to one.py
• Removing import logging from one.py
• Removing # type comment from one.py
• Changing undefined_variable in two.py to [] or ['a'] (but not when it's [1])

Is it just me or does this look very weird? ._.

[pradyunsg]

Output of mypy src, with no .mypy_cache:

src/one.py:4: error: Name 'Any' is not defined

Click to see output of mypy src -vv, run immediately after:

LOG:  Mypy version 0.610
TRACE: Looking for ignored at .mypy_cache/3.6/ignored/__init__.meta.json
TRACE: Meta ignored {"child_modules": ["ignored.two"], "data_mtime": 1528718789, "dep_lines": [1], "dep_prios": [5], "dependencies": ["builtins"], "deps_mtime": null, "hash": "d41d8cd98f00b204e9800998ecf8427e", "id": "ignored", "ignore_all": false, "interface_hash": "7c459e47627738d7f603c7e1e39bf244", "mtime": 1528717643, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any":false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": true, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/pip/src/ignored/__init__.py", "size": 0, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for ignored: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/pip/src/ignored/__init__.py
TRACE: Looking for ignored.two at .mypy_cache/3.6/ignored/two.meta.json
TRACE: Meta ignored.two {"child_modules": [], "data_mtime": 1528718789, "dep_lines": [1, 1], "dep_prios": [5, 5], "dependencies": ["collections", "builtins"], "deps_mtime": null, "hash": "6877b9cb41eae9c4a02f44d63fa7df9c", "id": "ignored.two", "ignore_all": false, "interface_hash": "4243b6502fd55df1582c7fb7bc51d172", "mtime": 1528718254, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": true, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/pip/src/ignored/two.py", "size": 89, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for ignored.two: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/pip/src/ignored/two.py
TRACE: Looking for one at .mypy_cache/3.6/one.meta.json
LOG:  Could not load cache for one: .mypy_cache/3.6/one.meta.json
LOG:  Metadata not found for one
LOG:  Parsing src/one.py (one)
TRACE: Looking for builtins at .mypy_cache/3.6/builtins.meta.json
TRACE: Meta builtins {"child_modules": [], "data_mtime": 1528718789, "dep_lines": [3, 10, 11, 12], "dep_prios": [5, 5, 5, 10], "dependencies": ["typing", "abc", "types", "sys"], "deps_mtime": null, "hash": "f02f7d2923d1d3176e5c6e9ca0e1bb50", "id": "builtins", "ignore_all": false, "interface_hash": "b7db4ebf9af84ab0add2988864445467", "mtime": 1528718778, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/builtins.pyi", "size": 46034, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for builtins: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/builtins.pyi
TRACE: Looking for collections at .mypy_cache/3.6/collections/__init__.meta.json
TRACE: Meta collections {"child_modules": ["collections.abc"], "data_mtime": 1528718788, "dep_lines": [6, 7, 13, 1, 1], "dep_prios": [10, 5, 10, 5, 30], "dependencies": ["sys", "typing", "collections.abc", "builtins", "abc"], "deps_mtime": null, "hash": "6e8c017af4fb0134016c50d5e0abf59f", "id": "collections", "ignore_all": false, "interface_hash": "21ddf23b372701468d5056b4bec37eba", "mtime": 1528718778, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/collections/__init__.pyi", "size": 15065, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for collections: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/collections/__init__.pyi
TRACE: Looking for logging at .mypy_cache/3.6/logging/__init__.meta.json
TRACE: Meta logging {"child_modules": [], "data_mtime": 1528718789, "dep_lines": [3, 7, 8, 9, 10, 11, 1, 1], "dep_prios": [5, 5, 5, 5, 10, 10, 5, 30], "dependencies": ["typing", "string", "time", "types", "sys", "threading", "builtins", "abc"], "deps_mtime": null, "hash": "eb7f0787091a8dfef1551159ceb92604", "id": "logging", "ignore_all": false, "interface_hash": "d00277b5b2db8afcf099f93c96335302", "mtime": 1528718778, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any":false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/2and3/logging/__init__.pyi", "size": 18609, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for logging: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/2and3/logging/__init__.pyi
TRACE: Looking for typing at .mypy_cache/3.6/typing.meta.json
TRACE: Meta typing {"child_modules": [], "data_mtime": 1528718788, "dep_lines": [3, 4, 5, 6, 1], "dep_prios": [10, 5, 5, 10, 5], "dependencies": ["sys", "abc", "types", "collections", "builtins"],"deps_mtime": null, "hash": "b25d91dc542923260f50d280df060e85", "id": "typing", "ignore_all": false, "interface_hash": "af12f09337aadfd6519a6dd4acd8572c", "mtime": 1528718778, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/typing.pyi", "size": 18942, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for typing: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/typing.pyi
TRACE: Looking for abc at .mypy_cache/3.6/abc.meta.json
TRACE: Meta abc {"child_modules": [], "data_mtime": 1528718788, "dep_lines": [1, 2, 1], "dep_prios": [5, 10, 5], "dependencies": ["typing", "sys", "builtins"], "deps_mtime": null, "hash": "b0cc9513c1f9ba454241898c7a660486", "id": "abc", "ignore_all": false, "interface_hash": "a66f97e11b354a43a7ddd96b5345321a", "mtime": 1528718778, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/abc.pyi", "size": 793, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for abc: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/abc.pyi
TRACE: Looking for types at .mypy_cache/3.6/types.meta.json
TRACE: Meta types {"child_modules": [], "data_mtime": 1528718788, "dep_lines": [6, 7, 14, 1, 1], "dep_prios": [10, 5, 5, 5, 30], "dependencies": ["sys", "typing", "_importlib_modulespec", "builtins", "abc"], "deps_mtime": null, "hash": "f41f7744ad8e6c4d4c3c55507da811a4", "id": "types", "ignore_all": false, "interface_hash": "07318e1f49cc8b6149fa523d80222049", "mtime": 1528718778, "options":{"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal","follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/types.pyi", "size": 7689, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for types: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/types.pyi
TRACE: Looking for sys at .mypy_cache/3.6/sys.meta.json
TRACE: Meta sys {"child_modules": [], "data_mtime": 1528718788, "dep_lines": [6, 11, 14, 1, 1, 1, 1], "dep_prios": [5, 5, 5, 5, 30, 30, 30], "dependencies": ["typing", "types", "importlib.abc", "builtins", "_importlib_modulespec", "abc", "importlib"], "deps_mtime": null, "hash": "8db7a3ca4604a6fbd07a6e540c990dcc", "id": "sys", "ignore_all": false, "interface_hash": "dd1e0502e2ac7b1ff60d906e7e84806a", "mtime": 1528718778, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr":false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/sys.pyi", "size": 5258, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for sys: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/sys.pyi
TRACE: Looking for collections.abc at .mypy_cache/3.6/collections/abc.meta.json
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LOG:  Metadata fresh for collections.abc: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/collections/abc.pyi
TRACE: Looking for string at .mypy_cache/3.6/string.meta.json
TRACE: Meta string {"child_modules": [], "data_mtime": 1528718789, "dep_lines": [5, 1, 1], "dep_prios": [5, 5, 30], "dependencies": ["typing", "builtins", "abc"], "deps_mtime": null, "hash": "8c133962915479b7b3d537abbd00ccf4", "id": "string", "ignore_all": false, "interface_hash": "7ba37dbcf6f13d053878a8776c045821", "mtime": 1528718778, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/string.pyi", "size": 1771, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for string: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/string.pyi
TRACE: Looking for time at .mypy_cache/3.6/time.meta.json
TRACE: Meta time {"child_modules": [], "data_mtime": 1528718789, "dep_lines": [4, 5, 7, 1, 1], "dep_prios": [10, 5, 5, 5, 30], "dependencies": ["sys", "typing", "types", "builtins", "abc"], "deps_mtime": null, "hash": "d0848c9c98081f61adce6cdcd1ea12f5", "id": "time", "ignore_all": false, "interface_hash": "83d2497dd833c3d6a57358de1b7487cd", "mtime": 1528718778, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/2and3/time.pyi", "size": 3866, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for time: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/2and3/time.pyi
TRACE: Looking for threading at .mypy_cache/3.6/threading.meta.json
TRACE: Meta threading {"child_modules": [], "data_mtime": 1528718789, "dep_lines": [3, 7, 8, 1, 1], "dep_prios": [5, 5, 10, 5, 30], "dependencies": ["typing", "types", "sys", "builtins", "abc"], "deps_mtime": null, "hash": "8011ad17f4382e26f7fb479cd3be50d6", "id": "threading", "ignore_all": false, "interface_hash": "f62d103c8099f7eb7f9b2a0d64ed2d4e", "mtime": 1528718778, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/2and3/threading.pyi", "size": 6492, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for threading: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/2and3/threading.pyi
TRACE: Looking for _importlib_modulespec at .mypy_cache/3.6/_importlib_modulespec.meta.json
TRACE: Meta _importlib_modulespec {"child_modules": [], "data_mtime": 1528718788, "dep_lines": [8, 9, 10, 1], "dep_prios": [5, 10, 5, 5], "dependencies": ["abc", "sys", "typing", "builtins"], "deps_mtime": null, "hash": "09004ca85efa650685c23791c33ab159", "id": "_importlib_modulespec", "ignore_all": false, "interface_hash": "9531beb50a822ca3cb3231a8a7503907", "mtime": 1528718778, "options":{"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal","follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/_importlib_modulespec.pyi", "size": 1813, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for _importlib_modulespec: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/_importlib_modulespec.pyi
TRACE: Looking for importlib.abc at .mypy_cache/3.6/importlib/abc.meta.json
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LOG:  Metadata fresh for importlib.abc: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/importlib/abc.pyi
TRACE: Looking for importlib at .mypy_cache/3.6/importlib/__init__.meta.json
TRACE: Meta importlib {"child_modules": ["importlib.util", "importlib.abc", "importlib.machinery"], "data_mtime": 1528718789, "dep_lines": [1, 2, 3, 4, 5, 1, 1], "dep_prios": [10, 5, 10, 10, 5, 5,30], "dependencies": ["importlib.util", "importlib.abc", "sys", "types", "typing", "builtins", "abc"], "deps_mtime": null, "hash": "0e34fbb5f56e88ae70ad7255827d7844", "id": "importlib", "ignore_all": false, "interface_hash": "c38b973ed98cbdf1abca0bb26e44fb98", "mtime": 1528718778, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/importlib/__init__.pyi", "size": 709, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for importlib: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/importlib/__init__.pyi
TRACE: Looking for os at .mypy_cache/3.6/os/__init__.meta.json
TRACE: Meta os {"child_modules": ["os.path"], "data_mtime": 1528718788, "dep_lines": [4, 5, 6, 12, 13, 14, 1], "dep_prios": [5, 10, 5, 5, 5, 10, 30], "dependencies": ["io", "sys", "typing", "builtins", "posix", "os.path", "abc"], "deps_mtime": null, "hash": "d75b0533ec7ad873fe690ec772c78e8d", "id": "os", "ignore_all": false, "interface_hash": "0e0b41ba6b6aaeebcdf80a98ec1e7e44", "mtime": 1528718778, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/os/__init__.pyi", "size": 27132, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for os: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/os/__init__.pyi
TRACE: Looking for importlib.util at .mypy_cache/3.6/importlib/util.meta.json
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LOG:  Metadata fresh for importlib.util: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/importlib/util.pyi
TRACE: Looking for io at .mypy_cache/3.6/io.meta.json
TRACE: Meta io {"child_modules": [], "data_mtime": 1528718788, "dep_lines": [1, 4, 5, 6, 7, 8, 1], "dep_prios": [5, 10, 10, 5, 10, 5, 30], "dependencies": ["typing", "builtins", "codecs", "mmap", "sys", "types", "abc"], "deps_mtime": null, "hash": "7453c9c6f57bd4d24ad11f9796cdd2a8", "id": "io", "ignore_all": false, "interface_hash": "648e42e230bcc9e7415430cf9f8028e4", "mtime": 1528718778, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores":false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/io.pyi", "size": 10514, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for io: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/io.pyi
TRACE: Looking for posix at .mypy_cache/3.6/posix.meta.json
TRACE: Meta posix {"child_modules": [], "data_mtime": 1528718788, "dep_lines": [5, 6, 1, 1], "dep_prios": [10, 5, 5, 30], "dependencies": ["sys", "typing", "builtins", "abc"], "deps_mtime": null, "hash": "422dd27650aebd83c5e8942ec4090a6d", "id": "posix", "ignore_all": false, "interface_hash": "594c2710fd8ffe3cda548414492f98c5", "mtime": 1528718778, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/posix.pyi", "size": 2761, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for posix: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/posix.pyi
TRACE: Looking for os.path at .mypy_cache/3.6/os/path.meta.json
TRACE: Meta os.path {"child_modules": [], "data_mtime": 1528718788, "dep_lines": [5, 6, 7, 15, 1], "dep_prios": [5, 10, 5, 5, 30], "dependencies": ["posix", "sys", "typing", "builtins", "abc"], "deps_mtime": null, "hash": "5d7c85c6b51a5caa5ea8f9ab2da9a9dc", "id": "os.path", "ignore_all": false, "interface_hash": "5f77841cc8ef59e15e3b9b48ebb03dd7", "mtime": 1528718778, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/os/path.pyi", "size": 6124, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for os.path: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/os/path.pyi
TRACE: Looking for importlib.machinery at .mypy_cache/3.6/importlib/machinery.meta.json
TRACE: Meta importlib.machinery {"child_modules": [], "data_mtime": 1528718789, "dep_lines": [1, 1, 2, 3, 4, 9, 1, 1], "dep_prios": [20, 10, 10, 10, 5, 5, 5, 30], "dependencies": ["importlib", "importlib.abc", "sys", "types", "typing", "_importlib_modulespec", "builtins", "abc"], "deps_mtime": null, "hash": "18f1509f4c7bac3905a891bfe1574c95", "id": "importlib.machinery", "ignore_all": false, "interface_hash": "ed77d2c80905f2bcd6a9e389bf524360", "mtime": 1528718778, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/importlib/machinery.pyi", "size": 7012, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for importlib.machinery: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/3/importlib/machinery.pyi
TRACE: Looking for codecs at .mypy_cache/3.6/codecs.meta.json
TRACE: Meta codecs {"child_modules": [], "data_mtime": 1528718788, "dep_lines": [3, 4, 20, 21, 1], "dep_prios": [10, 5, 5, 10, 5], "dependencies": ["sys", "typing", "abc", "types", "builtins"], "deps_mtime": null, "hash": "f7942aaae6e6c5c52c24fcc57b041099", "id": "codecs", "ignore_all": false, "interface_hash": "1baccfdab9fbdd119ec22f62f8663ae1", "mtime": 1528718778, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/2and3/codecs.pyi", "size": 8711, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for codecs: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/2and3/codecs.pyi
TRACE: Looking for mmap at .mypy_cache/3.6/mmap.meta.json
TRACE: Meta mmap {"child_modules": [], "data_mtime": 1528718788, "dep_lines": [1, 2, 1, 1], "dep_prios": [10, 5, 5, 30], "dependencies": ["sys", "typing", "builtins", "abc"], "deps_mtime": null, "hash": "52640e7a9c6c085ca310a8cd992b4823", "id": "mmap", "ignore_all": false, "interface_hash": "5b382e7a1b0afbd536350568034b83f9", "mtime": 1528718778, "options": {"always_false": [], "always_true": [], "check_untyped_defs": false, "disallow_any_decorated": false, "disallow_any_explicit": false, "disallow_any_expr": false, "disallow_any_generics": false, "disallow_any_unimported": false, "disallow_subclassing_any": false, "disallow_untyped_calls": false, "disallow_untyped_decorators": false, "disallow_untyped_defs": false, "follow_imports": "normal", "follow_imports_for_stubs": false, "ignore_errors": false, "ignore_missing_imports": false, "local_partial_types": false, "no_implicit_optional": false, "platform": "darwin", "quick_and_dirty": false, "show_none_errors": true, "strict_boolean": false, "strict_optional": true, "strict_optional_whitelist": null, "warn_no_return": true, "warn_return_any": false, "warn_unused_ignores": false}, "path": "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/2and3/mmap.pyi", "size": 2904, "suppressed": [], "version_id": "0.610"}
LOG:  Metadata fresh for mmap: file /Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/mypy/typeshed/stdlib/2and3/mmap.pyi
LOG:  Loaded graph with 25 nodes (0.030 sec)
LOG:  Found 8 SCCs; largest has 18 nodes
TRACE: Priorities for _importlib_modulespec: abc:5 sys:10 typing:5 builtins:5
TRACE: Priorities for types: sys:10 typing:5 _importlib_modulespec:5 builtins:5 abc:30
TRACE: Priorities for abc: typing:5 sys:10 builtins:5
TRACE: Priorities for typing: sys:10 abc:5 types:5 collections:10 builtins:5
TRACE: Priorities for mmap: sys:10 typing:5 builtins:5 abc:30
TRACE: Priorities for codecs: sys:10 typing:5 abc:5 types:10 builtins:5
TRACE: Priorities for posix: sys:10 typing:5 builtins:5 abc:30
TRACE: Priorities for importlib.abc: abc:5 os:10 sys:10 types:10 typing:5 _importlib_modulespec:5 builtins:5
TRACE: Priorities for collections: sys:10 typing:5 collections.abc:10 builtins:5 abc:30
TRACE: Priorities for os.path: posix:5 sys:10 typing:5 builtins:5 abc:30
TRACE: Priorities for io: typing:5 builtins:10 codecs:10 mmap:5 sys:10 types:5 abc:30
TRACE: Priorities for collections.abc: sys:10 collections:5 builtins:5 abc:30 typing:30
TRACE: Priorities for sys: typing:5 types:5 importlib.abc:5 builtins:5 _importlib_modulespec:30 abc:30 importlib:30
TRACE: Priorities for os: io:5 sys:10 typing:5 builtins:5 posix:5 os.path:10 abc:30
TRACE: Priorities for importlib.machinery: importlib:20 importlib.abc:10 sys:10 types:10 typing:5 _importlib_modulespec:5 builtins:5 abc:30
TRACE: Priorities for importlib.util: importlib:20 importlib.abc:10 importlib.machinery:10 sys:10 types:10 typing:5 builtins:5 abc:30
TRACE: Priorities for importlib: importlib.util:10 importlib.abc:5 sys:10 types:10 typing:5 builtins:5 abc:30
TRACE: Priorities for builtins: typing:5 abc:5 types:5 sys:10
TRACE: Queuing fresh SCC (_importlib_modulespec types abc typing mmap codecs posix importlib.abc collections os.path io collections.abc sys os importlib.machinery importlib.util importlib builtins)
TRACE: Priorities for threading:
TRACE: Queuing fresh SCC (threading)
TRACE: Priorities for time:
TRACE: Queuing fresh SCC (time)
TRACE: Priorities for string:
TRACE: Queuing fresh SCC (string)
TRACE: Priorities for ignored.two:
TRACE: Queuing fresh SCC (ignored.two)
TRACE: Priorities for ignored:
TRACE: Queuing fresh SCC (ignored)
TRACE: Priorities for logging:
TRACE: Queuing fresh SCC (logging)
TRACE: Priorities for one:
LOG:  Processing 7 queued fresh SCCs
LOG:  Build finished in 0.344 seconds with 23 modules, and 0 errors
Traceback (most recent call last):
  File "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/bin/mypy", line 11, in <module>
    sys.exit(console_entry())
  File "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/python3.6/site-packages/mypy/__main__.py", line 7, in console_entry
    main(None)
  File "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/python3.6/site-packages/mypy/main.py", line 91, in main
    res = type_check_only(sources, bin_dir, options, flush_errors, fscache)  # noqa
  File "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/python3.6/site-packages/mypy/main.py", line 148, in type_check_only
    fscache=fscache)
  File "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/python3.6/site-packages/mypy/build.py", line 185, in build
    flush_errors, fscache)
  File "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/python3.6/site-packages/mypy/build.py", line 285, in _build
    graph = dispatch(sources, manager)
  File "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/python3.6/site-packages/mypy/build.py", line 2398, in dispatch
    process_graph(graph, manager)
  File "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/python3.6/site-packages/mypy/build.py", line 2684, in process_graph
    process_fresh_modules(graph, prev_scc, manager)
  File "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/python3.6/site-packages/mypy/build.py", line 2770, in process_fresh_modules
    graph[id].fix_cross_refs()
  File "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/python3.6/site-packages/mypy/build.py", line 1853, in fix_cross_refs
    self.options.use_fine_grained_cache)
  File "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/python3.6/site-packages/mypy/fixup.py", line 25, in fixup_module
    node_fixer.visit_symbol_table(tree.names)
  File "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/python3.6/site-packages/mypy/fixup.py", line 95, in visit_symbol_table
    self.visit_type_info(value.node)
  File "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/python3.6/site-packages/mypy/fixup.py", line 48, in visit_type_info
    base.accept(self.type_fixer)
  File "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/python3.6/site-packages/mypy/types.py", line 512, in accept
    return visitor.visit_instance(self)
  File "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/python3.6/site-packages/mypy/fixup.py", line 156, in visit_instance
    inst.type = lookup_qualified_typeinfo(self.modules, type_ref, self.quick_and_dirty)
  File "/Users/pradyunsg/.venvwrap/venvs/tmp-6d13a16911bf03c/lib/python3.6/site-packages/mypy/fixup.py", line 246, in lookup_qualified_typeinfo
    assert quick_and_dirty, "Should never get here in normal mode"
AssertionError: Should never get here in normal mode

[ilevkivskyi]

Is it just me or does this look very weird?

Yes it is. But I think I understand the idea, it seems to me all this weird dance is needed to convince mypy it needs to deserialize MyClass that has an apparently broken base. I didn't test this hypothesis, will try this later.

[pradyunsg]

from collections import namedtuple

a = ['alpha', 'beta']


class MyClass(namedtuple('MyClass', a)):
    pass

This crashes as well.