Description
I'm running into an issue using the dataclasses-struct mypy plugin, where when running mypy it fails with the following error:
$ mypy main.py
Traceback (most recent call last):
File "/opt/hostedtoolcache/Python/3.13.3/x64/bin/mypy", line 8, in <module>
sys.exit(console_entry())
~~~~~~~~~~~~~^^
File "/opt/hostedtoolcache/Python/3.13.3/x64/lib/python3.13/site-packages/mypy/__main__.py", line 15, in console_entry
main()
~~~~^^
File "mypy/main.py", line 119, in main
File "mypy/main.py", line 203, in run_build
File "mypy/build.py", line 191, in build
File "mypy/build.py", line 267, in _build
File "mypy/build.py", line 2937, in dispatch
File "mypy/build.py", line 3335, in process_graph
File "mypy/build.py", line 3430, in process_stale_scc
File "mypy/semanal_main.py", line 99, in semantic_analysis_for_scc
File "mypy/semanal_main.py", line 443, in apply_class_plugin_hooks
File "mypy/semanal_main.py", line 479, in apply_hooks_to_class
File "/opt/hostedtoolcache/Python/3.13.3/x64/lib/python3.13/site-packages/dataclasses_struct/ext/mypy_plugin.py", line 15, in transform_dataclass_struct
tvd = TypeVarType(
'T',
...<4 lines>...
ctx.api.named_type('builtins.object'),
)
File "mypy/types.py", line 613, in __init__
TypeError: mypy.types.TypeVarId object expected; got intFor context, I'm using the following versions:
- Python 3.13.3
- mypy 1.15.0
- dataclasses-struct 0.8.3
I have the plugin enabled by adding the following lines to my pyproject.toml file:
[tool.mypy]
plugins = ["dataclasses_struct.ext.mypy_plugin"]Here is a minimal example that replicates the issue: