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Description
Crash Report
Originally discovered by @sharkdp: mypy crashes when type checking a module containing just the following:
()[::0]
Traceback
Traceback (most recent call last):
File "<frozen runpy>", line 198, in _run_module_as_main
File "<frozen runpy>", line 88, in _run_code
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/__main__.py", line 37, in <module>
console_entry()
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/__main__.py", line 15, in console_entry
main()
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/main.py", line 109, in main
res, messages, blockers = run_build(sources, options, fscache, t0, stdout, stderr)
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/main.py", line 193, in run_build
res = build.build(sources, options, None, flush_errors, fscache, stdout, stderr)
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/build.py", line 194, in build
result = _build(
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/build.py", line 269, in _build
graph = dispatch(sources, manager, stdout)
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/build.py", line 2936, in dispatch
process_graph(graph, manager)
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/build.py", line 3334, in process_graph
process_stale_scc(graph, scc, manager)
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/build.py", line 3435, in process_stale_scc
graph[id].type_check_first_pass()
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/build.py", line 2305, in type_check_first_pass
self.type_checker().check_first_pass()
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/checker.py", line 483, in check_first_pass
self.accept(d)
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/checker.py", line 592, in accept
stmt.accept(self)
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/nodes.py", line 1297, in accept
return visitor.visit_expression_stmt(self)
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/checker.py", line 4547, in visit_expression_stmt
expr_type = self.expr_checker.accept(s.expr, allow_none_return=True, always_allow_any=True)
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/checkexpr.py", line 5885, in accept
typ = node.accept(self)
^^^^^^^^^^^^^^^^^
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/nodes.py", line 2043, in accept
return visitor.visit_index_expr(self)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/checkexpr.py", line 4318, in visit_index_expr
result = self.visit_index_expr_helper(e)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/checkexpr.py", line 4334, in visit_index_expr_helper
return self.visit_index_with_type(left_type, e)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/checkexpr.py", line 4369, in visit_index_with_type
return self.visit_tuple_slice_helper(left_type, index)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/checkexpr.py", line 4495, in visit_tuple_slice_helper
item = left_type.slice(b, e, s, fallback=self.named_type("builtins.tuple"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/layers/google.python.pip/pip/lib/python3.12/site-packages/mypy/types.py", line 2549, in slice
slice_items = self.items[begin:end:stride]
~~~~~~~~~~^^^^^^^^^^^^^^^^^^
ValueError: slice step cannot be zero
main.py:1: 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: 1.14.0+dev.2d785dffee4440b9e5fd4c4f7dbf8787a829f5fa
main.py:1: : note: use --pdb to drop into pdb
Your Environment
- Mypy version used: 1.14.0+dev.2d785dffee4440b9e5fd4c4f7dbf8787a829f5fa
- Python version used: 3.13