Panicked at 'byte index 18446744073709551615 is out of bounds of ik0loc, ik1, ik2 = ', crates/ruff_python_parser/src/string.rs:321:30

[qarmin]

Ruff 0.0.287 (latest changes from main branch)

ruff  *.py --select ALL,NURSERY --no-cache

file content:

                                # print(f"{ik0loc, ik1, ik2 = }; {ik1c, ik2c = }")

error:

https://github.com/astral-sh/ruff/issues/new?title=%5BLinter%20panic%5D

with the relevant file contents, the `pyproject.toml` settings, and the following stack trace, we'd be very appreciative!

panicked at 'byte index 18446744073709551615 is out of bounds of `ik0loc, ik1, ik2 = `', crates/ruff_python_parser/src/string.rs:321:30
Backtrace:    0: ruff_cli::panic::catch_unwind::{{closure}}
   1: <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/alloc/src/boxed.rs:2007:9
   2: std::panicking::rust_panic_with_hook
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:709:13
   3: std::panicking::begin_panic_handler::{{closure}}
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:597:13
   4: std::sys_common::backtrace::__rust_end_short_backtrace
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/sys_common/backtrace.rs:151:18
   5: rust_begin_unwind
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:593:5
   6: core::panicking::panic_fmt
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/core/src/panicking.rs:67:14
   7: core::str::slice_error_fail_rt
   8: core::str::slice_error_fail
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/core/src/str/mod.rs:87:9
   9: <alloc::string::String as core::ops::index::Index<core::ops::range::RangeTo<usize>>>::index
  10: ruff_python_parser::string::StringParser::parse_fstring
  11: ruff_python_parser::string::parse_strings
  12: ruff_python_parser::python::__action708
  13: ruff_python_parser::python::__parse__Top::__reduce
  14: ruff_python_parser::parser::parse_tokens
  15: ruff_python_parser::parser::parse_suite
  16: ruff::checkers::tokens::check_tokens
  17: ruff::linter::check_path
  18: ruff::linter::lint_fix
  19: ruff_cli::diagnostics::lint_path
  20: rayon::iter::plumbing::bridge_producer_consumer::helper
  21: ruff_cli::commands::check::check
  22: ruff_cli::check
  23: ruff_cli::run
  24: ruff::main
  25: std::sys_common::backtrace::__rust_begin_short_backtrace
  26: main
  27: __libc_start_call_main
             at ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
  28: __libc_start_main_impl
             at ./csu/../csu/libc-start.c:360:3
  29: _start

39205396.py.zip

[MichaReiser]

Lol, that's a good one. CC: @dhruvmanila

[dhruvmanila]

This is same as #6831 and is fixed with the new f-string parser. Closing this in favor of that issue.

[qarmin]

Quite strange that this crashes also when code is commented.

[dhruvmanila]

That's a good point. It's because of https://beta.ruff.rs/docs/rules/commented-out-code/ (ERA001) which has a heuristic to parse the commented out code minus the # character:

ruff/crates/ruff/src/rules/eradicate/detection.rs

Lines 81 to 82 in c05e462

	// Finally, compile the source code.
	parse_suite(&line, "<filename>").is_ok()