Internal error when enabling reports #9433
Description
🐛 Bug Report
Mypy throws an internal error when running with a specific file, options and generating a coverage report.
I tried a few versions and the master, but all throw the same error.
It does however generate the report.
To Reproduce
These come from an actual project, but I managed to figure out the smallest possible reproducible example:
.
├── common
│ ├── __init__.py
│ └── encoder.py
└── empty.py
1 directory, 3 files
__init__.py:
from common import encoder
encoder.py:
import simplejson as json
class MyJSONEncoder(json.JSONEncoder):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs) # type: ignore
empty.py is empty.
Then run mypy with either --txt-report or --cobertura-xml-report and the --disallow-untyped-calls and --check-untyped-defs flags.
Expected Behavior
Report should be generated without an error.
Actual Behavior
./common/encoder.py: error: INTERNAL ERROR -- Please try using mypy master on Github:
https://mypy.rtfd.io/en/latest/common_issues.html#using-a-development-mypy-build
Please report a bug at https://github.com/python/mypy/issues
version: 0.782
Traceback (most recent call last):
File "<snip>/python/3.8.0/bin/mypy", line 10, in <module>
sys.exit(console_entry())
File "mypy/build.py", line 1919, in wrap_context
File "mypy/build.py", line 2147, in finish_passes
File "mypy/build.py", line 801, in report_file
File "mypy/report.py", line 83, in file
File "mypy/report.py", line 476, in on_file
File "mypy/nodes.py", line 294, in accept
File "mypy/stats.py", line 89, in visit_mypy_file
File "mypy/traverser.py", line 35, in visit_mypy_file
File "mypy/nodes.py", line 939, in accept
File "mypy/stats.py", line 158, in visit_class_def
File "mypy/nodes.py", line 1004, in accept
File "mypy/traverser.py", line 39, in visit_block
File "mypy/nodes.py", line 676, in accept
File "mypy/stats.py", line 139, in visit_func_def
File "mypy/traverser.py", line 54, in visit_func_def
File "mypy/traverser.py", line 51, in visit_func
File "mypy/nodes.py", line 1004, in accept
File "mypy/traverser.py", line 39, in visit_block
File "mypy/nodes.py", line 1019, in accept
File "mypy/stats.py", line 192, in visit_expression_stmt
File "mypy/traverser.py", line 82, in visit_expression_stmt
File "mypy/nodes.py", line 1544, in accept
File "mypy/stats.py", line 225, in visit_call_expr
File "mypy/stats.py", line 234, in record_call_target_precision
File "mypy/stats.py", line 248, in record_callable_target_precision
File "mypy/argmap.py", line 101, in map_formals_to_actuals
File "mypy/argmap.py", line 39, in map_actuals_to_formals
File "mypy/stats.py", line 253, in <lambda>
KeyError: <mypy.nodes.NameExpr object at 0x11286f430>
./common/encoder.py: : note: use --pdb to drop into pdb
Generated TXT report (via XSLT): <snip>/report/index.txt
Your Environment
- Mypy version used: 0.770, 0.782 and master
- Mypy command-line flags:
--txt-report report --show-traceback --disallow-untyped-calls --check-untyped-defs - Mypy configuration options from
mypy.ini(and other config files): - Python version used: 3.8.0
- Operating system and version: