Document fix safety

[dylwil3]

The rules found in the locations listed below need to have a ## Fix safety section added to their doc comment to explain whether and why their fix is sometimes or always unsafe.

If you're interested in picking any of these up then first of all - thank you, it's a big help! To help make the review process quick and get your PR merged, please include the following information in your PR:

1. (In your PR summary) A link to the PR where the fix was introduced and/or made unsafe
2. (In your PR summary) If present, a link to a comment in the original PR or in the codebase where some reasoning is given around the safety
3. In your PR summary) If possible, a code sample demonstrating the unsafety
4. (In the section on fix safety) Please distinguish between whether the fix is always unsafe or sometimes unsafe.
5. (In your section on fix safety) Be sure to double check grammar and spelling!

Thank you again!

Checklist of rules

• crates/ruff_linter/src/rules/ruff/rules/quadratic_list_summation.rs
• crates/ruff_linter/src/rules/ruff/rules/invalid_formatter_suppression_comment.rs ([ruff] add fix safety section (RUF028) #17722)
• crates/ruff_linter/src/rules/ruff/rules/collection_literal_concatenation.rs
• crates/ruff_linter/src/rules/ruff/rules/implicit_optional.rs
• crates/ruff_linter/src/rules/ruff/rules/unnecessary_round.rs
• crates/ruff_linter/src/rules/ruff/rules/missing_fstring_syntax.rs
• crates/ruff_linter/src/rules/ruff/rules/zip_instead_of_pairwise.rs ([ruff] add fix safety section (RUF007) #17755)
• crates/ruff_linter/src/rules/ruff/rules/post_init_default.rs
• crates/ruff_linter/src/rules/flynt/rules/static_join_to_fstring.rs
• crates/ruff_linter/src/rules/pylint/rules/useless_import_alias.rs
• crates/ruff_linter/src/rules/pylint/rules/modified_iterating_set.rs ([pylint] add fix safety section (PLE4703) #17824)
• crates/ruff_linter/src/rules/pylint/rules/unnecessary_dunder_call.rs ([pylint] add fix safety section (PLC2801) #17825)
• crates/ruff_linter/src/rules/pylint/rules/sys_exit_alias.rs
• crates/ruff_linter/src/rules/pylint/rules/nested_min_max.rs ([pylint] add fix safety section (PLW3301) #17878)
• crates/ruff_linter/src/rules/pylint/rules/unspecified_encoding.rs
• crates/ruff_linter/src/rules/pylint/rules/repeated_equality_comparison.rs
• crates/ruff_linter/src/rules/pycodestyle/rules/lambda_assignment.rs
• crates/ruff_linter/src/rules/pycodestyle/rules/trailing_whitespace.rs
• crates/ruff_linter/src/rules/flake8_pytest_style/rules/assertion.rs
• crates/ruff_linter/src/rules/flake8_pytest_style/rules/fixture.rs
• crates/ruff_linter/src/rules/flake8_pytest_style/rules/marks.rs
• crates/ruff_linter/src/rules/flake8_pie/rules/duplicate_class_field_definition.rs
• crates/ruff_linter/src/rules/flake8_return/rules/function.rs
• crates/ruff_linter/src/rules/flake8_bugbear/rules/mutable_argument_default.rs ([flake8-bugbear ] Add fix safety section (B006)  #17652)
• crates/ruff_linter/src/rules/flake8_bugbear/rules/unused_loop_control_variable.rs
• crates/ruff_linter/src/rules/flake8_logging/rules/invalid_get_logger_argument.rs
• crates/ruff_linter/src/rules/flake8_logging/rules/direct_logger_instantiation.rs
• crates/ruff_linter/src/rules/flake8_pyi/rules/docstring_in_stubs.rs
• crates/ruff_linter/src/rules/pydocstyle/rules/one_liner.rs
• crates/ruff_linter/src/rules/pydocstyle/rules/ends_with_period.rs
• crates/ruff_linter/src/rules/pydocstyle/rules/ends_with_punctuation.rs
• crates/ruff_linter/src/rules/pydocstyle/rules/backslashes.rs
• crates/ruff_linter/src/rules/flake8_type_checking/rules/typing_only_runtime_import.rs
• crates/ruff_linter/src/rules/flake8_type_checking/rules/runtime_import_in_type_checking_block.rs
• crates/ruff_linter/src/rules/numpy/rules/numpy_2_0_deprecation.rs
• crates/ruff_linter/src/rules/flake8_simplify/rules/needless_bool.rs ([flake8-simplify] add fix safety section (SIM103) #18086)
• crates/ruff_linter/src/rules/flake8_simplify/rules/ast_with.rs
• crates/ruff_linter/src/rules/flake8_simplify/rules/collapsible_if.rs
• crates/ruff_linter/src/rules/flake8_simplify/rules/if_else_block_instead_of_dict_get.rs
• crates/ruff_linter/src/rules/flake8_simplify/rules/suppressible_exception.rs
• crates/ruff_linter/src/rules/flake8_simplify/rules/ast_bool_op.rs
• crates/ruff_linter/src/rules/flake8_simplify/rules/ast_expr.rs
• crates/ruff_linter/src/rules/flake8_simplify/rules/reimplemented_builtin.rs
• crates/ruff_linter/src/rules/flake8_simplify/rules/ast_ifexp.rs
• crates/ruff_linter/src/rules/flake8_simplify/rules/if_else_block_instead_of_if_exp.rs
• crates/ruff_linter/src/rules/flake8_import_conventions/rules/unconventional_import_alias.rs
• crates/ruff_linter/src/rules/flake8_annotations/rules/definition.rs
• crates/ruff_linter/src/rules/flake8_raise/rules/unnecessary_paren_on_raise_exception.rs
• crates/ruff_linter/src/rules/perflint/rules/manual_list_comprehension.rs
• crates/ruff_linter/src/rules/fastapi/rules/fastapi_non_annotated_dependency.rs
• crates/ruff_linter/src/rules/fastapi/rules/fastapi_redundant_response_model.rs
• crates/ruff_linter/src/rules/pandas_vet/rules/inplace_argument.rs
• crates/ruff_linter/src/rules/refurb/rules/unnecessary_enumerate.rs
• crates/ruff_linter/src/rules/refurb/rules/check_and_remove_from_set.rs
• crates/ruff_linter/src/rules/refurb/rules/repeated_append.rs
• crates/ruff_linter/src/rules/refurb/rules/print_empty_string.rs
• crates/ruff_linter/src/rules/refurb/rules/delete_full_slice.rs
• crates/ruff_linter/src/rules/refurb/rules/implicit_cwd.rs
• crates/ruff_linter/src/rules/refurb/rules/readlines_in_for.rs
• crates/ruff_linter/src/rules/flake8_async/rules/long_sleep_not_forever.rs
• crates/ruff_linter/src/rules/flake8_errmsg/rules/string_in_exception.rs
• crates/ruff_linter/src/rules/flake8_tidy_imports/rules/relative_imports.rs
• crates/ruff_linter/src/rules/pyupgrade/rules/unnecessary_builtin_import.rs
• crates/ruff_linter/src/rules/pyupgrade/rules/use_pep695_type_alias.rs
• crates/ruff_linter/src/rules/pyupgrade/rules/use_pep604_isinstance.rs
• crates/ruff_linter/src/rules/pyupgrade/rules/format_literals.rs ([pyupgrade] Add fix safety section to docs (UP030) #17443)
• crates/ruff_linter/src/rules/pyupgrade/rules/outdated_version_block.rs ([pyupgrade] Add fix safety section to docs (UP036) #17444)
• crates/ruff_linter/src/rules/pyupgrade/rules/replace_stdout_stderr.rs ([pyupgrade] Add fix safety section to docs (UP008, UP022) #17441)
• crates/ruff_linter/src/rules/pyupgrade/rules/super_call_with_parameters.rs ([pyupgrade] Add fix safety section to docs (UP008, UP022) #17441)
• crates/ruff_linter/src/rules/pyflakes/rules/repeated_keys.rs ([pyflakes] Add fix safety section to docs (F601, F602) #17440)
• crates/ruff_linter/src/rules/pyflakes/rules/unused_variable.rs ([pyflakes] Add fix safety section (F841) #17410)

[InSyncWithFoo]

A linked version of the list:

• quadratic_list_summation.rs
• invalid_formatter_suppression_comment.rs
• collection_literal_concatenation.rs
• implicit_optional.rs
• unnecessary_round.rs
• missing_fstring_syntax.rs
• zip_instead_of_pairwise.rs
• post_init_default.rs
• static_join_to_fstring.rs
• useless_import_alias.rs
• modified_iterating_set.rs
• unnecessary_dunder_call.rs
• sys_exit_alias.rs
• nested_min_max.rs
• unspecified_encoding.rs
• repeated_equality_comparison.rs
• lambda_assignment.rs
• trailing_whitespace.rs
• assertion.rs
• fixture.rs
• marks.rs
• duplicate_class_field_definition.rs
• function.rs
• mutable_argument_default.rs
• unused_loop_control_variable.rs
• invalid_get_logger_argument.rs
• direct_logger_instantiation.rs
• docstring_in_stubs.rs
• one_liner.rs
• ends_with_period.rs
• ends_with_punctuation.rs
• backslashes.rs
• typing_only_runtime_import.rs
• runtime_import_in_type_checking_block.rs
• numpy_2_0_deprecation.rs
• needless_bool.rs
• ast_with.rs
• collapsible_if.rs
• if_else_block_instead_of_dict_get.rs
• suppressible_exception.rs
• ast_bool_op.rs
• ast_expr.rs
• reimplemented_builtin.rs
• ast_ifexp.rs
• if_else_block_instead_of_if_exp.rs
• unconventional_import_alias.rs
• definition.rs
• unnecessary_paren_on_raise_exception.rs
• manual_list_comprehension.rs
• fastapi_non_annotated_dependency.rs
• fastapi_redundant_response_model.rs
• inplace_argument.rs
• unnecessary_enumerate.rs
• check_and_remove_from_set.rs
• repeated_append.rs
• print_empty_string.rs
• delete_full_slice.rs
• implicit_cwd.rs
• readlines_in_for.rs
• long_sleep_not_forever.rs
• string_in_exception.rs
• relative_imports.rs
• unnecessary_builtin_import.rs
• use_pep695_type_alias.rs
• use_pep604_isinstance.rs
• format_literals.rs
• outdated_version_block.rs
• replace_stdout_stderr.rs
• super_call_with_parameters.rs
• repeated_keys.rs
• unused_variable.rs

[sanwalsulehri]

can i do this

[MichaReiser]

@sanwalsulehri sure, feel free to tackle them one by one

[sanwalsulehri]

yeah sure

[dhruvmanila]

Please comment here on which rule you're going to tackle to avoid duplicate work :)

[Kalmaegi]

I'd like to give it a try, starting from the unused_variable.rs.