Closed
Description
Crash Report
Running myyp produces: AssertionError: Must not defer during final iteration
Traceback
> mypy . --show-traceback
./mypybug.py:18: error: INTERNAL ERROR -- Please try using mypy master on Github:
https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
Please report a bug at https://github.com/python/mypy/issues
version: 0.940+dev.c0e49abcf27ff59e761f3ec06a24ee94e700464d
Traceback (most recent call last):
File "/Users/mostrows/.pyenv/versions/3.10.1/bin/mypy", line 8, in <module>
sys.exit(console_entry())
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/__main__.py", line 12, in console_entry
main(None, sys.stdout, sys.stderr)
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/main.py", line 96, in main
res, messages, blockers = run_build(sources, options, fscache, t0, stdout, stderr)
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/main.py", line 173, in run_build
res = build.build(sources, options, None, flush_errors, fscache, stdout, stderr)
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/build.py", line 180, in build
result = _build(
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/build.py", line 256, in _build
graph = dispatch(sources, manager, stdout)
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/build.py", line 2715, in dispatch
process_graph(graph, manager)
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/build.py", line 3046, in process_graph
process_stale_scc(graph, scc, manager)
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/build.py", line 3138, in process_stale_scc
mypy.semanal_main.semantic_analysis_for_scc(graph, scc, manager.errors)
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/semanal_main.py", line 79, in semantic_analysis_for_scc
process_functions(graph, scc, patches)
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/semanal_main.py", line 233, in process_functions
process_top_level_function(analyzer,
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/semanal_main.py", line 274, in process_top_level_function
deferred, incomplete, progress = semantic_analyze_target(target, state, node, active_type,
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/semanal_main.py", line 326, in semantic_analyze_target
analyzer.refresh_partial(refresh_node,
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/semanal.py", line 415, in refresh_partial
self.accept(node)
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/semanal.py", line 5171, in accept
node.accept(self)
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/nodes.py", line 730, in accept
return visitor.visit_func_def(self)
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/semanal.py", line 628, in visit_func_def
self.analyze_func_def(defn)
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/semanal.py", line 660, in analyze_func_def
self.defer(defn)
File "/Users/mostrows/.pyenv/versions/3.10.1/lib/python3.10/site-packages/mypy/semanal.py", line 4871, in defer
assert not self.final_iteration, 'Must not defer during final iteration'
AssertionError: Must not defer during final iteration
./mypybug.py:18: : note: use --pdb to drop into pdb
To Reproduce
source of mypybug.py:
import dataclasses
import typing
if typing.TYPE_CHECKING:
import classb as b
ItemType = typing.TypeVar('ItemType', bound='b.ClassB')
class Item(typing.Protocol):
name: str
class ItemBase(typing.Generic[ItemType]):
pass
# dataclasses required to trigger bug.
@dataclasses.dataclass(kw_only=True)
class ItemBaseX(ItemBase[ItemType]):
name: str
Source of classb.py:
import typing
# This import is required to trigger bug.
import mypybug as eitem
class ClassB(typing.Protocol):
field: str
Executed:
mypy mypybug.py
Your Environment
- Mypy version used: 0.940+dev.c0e49abcf27ff59e761f3ec06a24ee94e700464d (and others)
- Mypy command-line flags: none
- Mypy configuration options from
mypy.ini(and other config files): none - Python version used: 3.10.1
- Operating system and version: mac os 12.1