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Setting 'item' attribute as an instance created earlier leads to an internal error #15380
Description
The code sets up a class with a 'NamedTuple' type and initializes an instance of that class with a specified field. The "item" attribute of the instance holds an instance of NamedTuple created earlier. Mypy reports an internal error.
Example.py
from typing import NamedTuple
class Test:
def __init__(self, field):
self.Item = NamedTuple("x", [(field, str)])
self.item: self.Item
The expected behavior:
It does not report an internal error.
The actual behavior:
/home/xxm/Desktop/example.py:7: 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: 1.4.0+dev.66bd2c441277b29b1454e26b2a3454a0dae5fb18
Traceback (most recent call last):
File "/home/xxm/.local/bin/mypy", line 8, in <module>
sys.exit(console_entry())
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/__main__.py", line 15, in console_entry
main()
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/main.py", line 95, in main
res, messages, blockers = run_build(sources, options, fscache, t0, stdout, stderr)
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/main.py", line 174, in run_build
res = build.build(sources, options, None, flush_errors, fscache, stdout, stderr)
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/build.py", line 194, in build
result = _build(
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/build.py", line 267, in _build
graph = dispatch(sources, manager, stdout)
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/build.py", line 2926, in dispatch
process_graph(graph, manager)
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/build.py", line 3324, in process_graph
process_stale_scc(graph, scc, manager)
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/build.py", line 3419, in process_stale_scc
mypy.semanal_main.semantic_analysis_for_scc(graph, scc, manager.errors)
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/semanal_main.py", line 95, in semantic_analysis_for_scc
process_functions(graph, scc, patches)
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/semanal_main.py", line 253, in process_functions
process_top_level_function(
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/semanal_main.py", line 292, in process_top_level_function
deferred, incomplete, progress = semantic_analyze_target(
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/semanal_main.py", line 350, in semantic_analyze_target
analyzer.refresh_partial(
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/semanal.py", line 603, in refresh_partial
self.accept(node)
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/semanal.py", line 6352, in accept
node.accept(self)
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/nodes.py", line 786, in accept
return visitor.visit_func_def(self)
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/semanal.py", line 833, in visit_func_def
self.analyze_func_def(defn)
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/semanal.py", line 897, in analyze_func_def
self.analyze_function_body(defn)
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/semanal.py", line 1390, in analyze_function_body
defn.body.accept(self)
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/nodes.py", line 1220, in accept
return visitor.visit_block(self)
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/semanal.py", line 4562, in visit_block
self.accept(s)
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/semanal.py", line 6352, in accept
node.accept(self)
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/nodes.py", line 1307, in accept
return visitor.visit_assignment_stmt(self)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/semanal.py", line 2824, in visit_assignment_stmt
self.record_special_form_lvalue(s)
File "/home/xxm/.local/lib/python3.11/site-packages/mypy/semanal.py", line 3045, in record_special_form_lvalue
assert isinstance(lvalue, NameExpr)
AssertionError:
/home/xxm/Desktop/example.py:7: : note: use --pdb to drop into pdb
Test environment:
Mypy version: 1.4.0+ (master)
Python version: 3.11.3
Operating System: Ubuntu 18.04
How to install MyPy: "python3 -m pip install -U git+https://github.com/python/mypy.git"
Activity
Fix crash on NamedTuple as attribute (#15404)
Fix crash on NamedTuple as attribute (#15404)