Prevent crashing when match arms use name of existing callable
#18449
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… match as non-Vars
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I have a trivial fix for the rest of #13666 (reachability issue, |
mypy/checker.py
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| if type_map: | ||
| for expr, typ in list(type_map.items()): | ||
| if isinstance(expr, NameExpr): | ||
| node = expr.node | ||
| assert isinstance(node, Var) | ||
| if node not in inferred_types or not is_subtype(typ, inferred_types[node]): | ||
| if isinstance(node, Var) and ( |
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(maybe silly q, not too familiar with this code) why do we need to do this only if node is a Var?
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Diff from mypy_primer, showing the effect of this PR on open source code: schemathesis (https://github.com/schemathesis/schemathesis)
- File "/tmp/mypy_primer/old_mypy/venv/bin/mypy", line 8, in <module>
+ File "/tmp/mypy_primer/new_mypy/venv/bin/mypy", line 8, in <module>
- File "/tmp/mypy_primer/old_mypy/venv/lib/python3.12/site-packages/mypy/__main__.py", line 15, in console_entry
+ File "/tmp/mypy_primer/new_mypy/venv/lib/python3.12/site-packages/mypy/__main__.py", line 15, in console_entry
- File "/tmp/mypy_primer/old_mypy/venv/lib/python3.12/site-packages/mypy/main.py", line 119, in main
+ File "/tmp/mypy_primer/new_mypy/venv/lib/python3.12/site-packages/mypy/main.py", line 119, in main
- File "/tmp/mypy_primer/old_mypy/venv/lib/python3.12/site-packages/mypy/main.py", line 203, in run_build
+ File "/tmp/mypy_primer/new_mypy/venv/lib/python3.12/site-packages/mypy/main.py", line 203, in run_build
- File "/tmp/mypy_primer/old_mypy/venv/lib/python3.12/site-packages/mypy/build.py", line 191, in build
+ File "/tmp/mypy_primer/new_mypy/venv/lib/python3.12/site-packages/mypy/build.py", line 191, in build
- File "/tmp/mypy_primer/old_mypy/venv/lib/python3.12/site-packages/mypy/build.py", line 267, in _build
+ File "/tmp/mypy_primer/new_mypy/venv/lib/python3.12/site-packages/mypy/build.py", line 267, in _build
- File "/tmp/mypy_primer/old_mypy/venv/lib/python3.12/site-packages/mypy/build.py", line 2947, in dispatch
+ File "/tmp/mypy_primer/new_mypy/venv/lib/python3.12/site-packages/mypy/build.py", line 2947, in dispatch
- File "/tmp/mypy_primer/old_mypy/venv/lib/python3.12/site-packages/mypy/build.py", line 976, in write_deps_cache
+ File "/tmp/mypy_primer/new_mypy/venv/lib/python3.12/site-packages/mypy/build.py", line 976, in write_deps_cache
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hauntsaninja
approved these changes
Jan 13, 2025
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Fixes #16793. Fixes crash in #13666.
Previously mypy considered that variables in match/case patterns must be Var's, causing a hard crash when a name of captured pattern clashes with a name of some existing function. This PR removes such assumption about Var and allows other nodes.