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[syntax-errors] Star expression in index before Python 3.11 (#16544)

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Summary
--

This PR detects tuple unpacking expressions in index/subscript
expressions before Python 3.11.

Test Plan
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New inline tests
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Brent Westbrook 2025-03-14 10:51:34 -04:00 • committed by GitHub
parent 2cd25ef641
commit 4f2851982d
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7
crates/ruff_python_parser/resources/inline/err/star_index_py310.py Normal file
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@ -0,0 +1,7 @@
# parse_options: {"target-version": "3.10"}
lst[*index] # simple index
class Array(Generic[DType, *Shape]): ... # motivating example from the PEP
lst[a, *b, c] # different positions
lst[a, b, *c] # different positions
lst[*a, *b] # multiple unpacks
array[3:5, *idxs] # mixed with slices

1
crates/ruff_python_parser/resources/inline/err/star_slices.py Normal file
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@ -0,0 +1 @@
array[*start:*end]

7
crates/ruff_python_parser/resources/inline/ok/star_index_py311.py Normal file
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# parse_options: {"target-version": "3.11"}
lst[*index] # simple index
class Array(Generic[DType, *Shape]): ... # motivating example from the PEP
lst[a, *b, c] # different positions
lst[a, b, *c] # different positions
lst[*a, *b] # multiple unpacks
array[3:5, *idxs] # mixed with slices