Panic f-string: unexpected token TStringMiddle #19751
Description
Quite similar to #18860
File content(at the bottom should be attached raw, not formatted file - github removes some non-printable characters, so copying from here may not work):
_='''{s''T'{: '''
command
timeout -v 300 ruff check TEST___FILE.py --select ALL --preview --output-format concise --no-cache --fix --unsafe-fixes --isolated
cause this
All checks passed!
warning: `incorrect-blank-line-before-class` (D203) and `no-blank-line-before-class` (D211) are incompatible. Ignoring `incorrect-blank-line-before-class`.
warning: `multi-line-summary-first-line` (D212) and `multi-line-summary-second-line` (D213) are incompatible. Ignoring `multi-line-summary-second-line`.
error: Panicked while linting /opt/BROKEN_FILES_DIR/917_IDX_0_RAND_244014174919259028981136_minimized_366.py: This indicates a bug in Ruff. If you could open an issue at:
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 crates/ruff_python_parser/src/parser/expression.rs:1695:25:
internal error: entered unreachable code: f-string: unexpected token `TStringMiddle` at 12..13
Backtrace: 0: ruff_db::panic::install_hook::{{closure}}::{{closure}}
at ./ruff-main/crates/ruff_db/src/panic.rs:91:34
1: <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call
at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library/alloc/src/boxed.rs:1985:9
2: std::panicking::rust_panic_with_hook
at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library/std/src/panicking.rs:841:13
3: std::panicking::begin_panic_handler::{{closure}}
at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library/std/src/panicking.rs:706:13
4: std::sys::backtrace::__rust_end_short_backtrace
at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library/std/src/sys/backtrace.rs:174:18
5: __rustc::rust_begin_unwind
at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library/std/src/panicking.rs:697:5
6: core::panicking::panic_fmt
at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library/core/src/panicking.rs:75:14
7: ruff_python_parser::parser::expression::<impl ruff_python_parser::parser::Parser>::parse_interpolated_string_elements::{{closure}}
at ./ruff-main/crates/ruff_python_parser/src/parser/expression.rs:1695:25
8: ruff_python_parser::parser::Parser::parse_list
at ./ruff-main/crates/ruff_python_parser/src/parser/mod.rs:508:17
9: ruff_python_parser::parser::expression::<impl ruff_python_parser::parser::Parser>::parse_interpolated_string_elements
at ./ruff-main/crates/ruff_python_parser/src/parser/expression.rs:1652:14
10: ruff_python_parser::parser::expression::<impl ruff_python_parser::parser::Parser>::parse_interpolated_element
at ./ruff-main/crates/ruff_python_parser/src/parser/expression.rs:1841:33
11: ruff_python_parser::parser::expression::<impl ruff_python_parser::parser::Parser>::parse_interpolated_string_elements::{{closure}}
at ./ruff-main/crates/ruff_python_parser/src/parser/expression.rs:1657:32
12: ruff_python_parser::parser::Parser::parse_list
at ./ruff-main/crates/ruff_python_parser/src/parser/mod.rs:508:17
13: ruff_python_parser::parser::expression::<impl ruff_python_parser::parser::Parser>::parse_interpolated_string_elements
at ./ruff-main/crates/ruff_python_parser/src/parser/expression.rs:1652:14
14: ruff_python_parser::parser::expression::<impl ruff_python_parser::parser::Parser>::parse_interpolated_string
at ./ruff-main/crates/ruff_python_parser/src/parser/expression.rs:1532:29
15: ruff_python_parser::parser::expression::<impl ruff_python_parser::parser::Parser>::parse_strings
at ./ruff-main/crates/ruff_python_parser/src/parser/expression.rs:1248:26
16: ruff_python_parser::parser::expression::<impl ruff_python_parser::parser::Parser>::parse_atom
at ./ruff-main/crates/ruff_python_parser/src/parser/expression.rs:612:22
17: ruff_python_parser::parser::expression::<impl ruff_python_parser::parser::Parser>::parse_lhs_expression
at ./ruff-main/crates/ruff_python_parser/src/parser/expression.rs:413:24
18: ruff_python_parser::parser::expression::<impl ruff_python_parser::parser::Parser>::parse_binary_expression_or_higher
at ./ruff-main/crates/ruff_python_parser/src/parser/expression.rs:248:24
19: ruff_python_parser::parser::expression::<impl ruff_python_parser::parser::Parser>::parse_simple_expression
at ./ruff-main/crates/ruff_python_parser/src/parser/expression.rs:236:14
20: ruff_python_parser::parser::expression::<impl ruff_python_parser::parser::Parser>::parse_conditional_expression_or_higher_impl
at ./ruff-main/crates/ruff_python_parser/src/parser/expression.rs:213:36
21: ruff_python_parser::parser::expression::<impl ruff_python_parser::parser::Parser>::parse_expression_list
at ./ruff-main/crates/ruff_python_parser/src/parser/expression.rs:151:32
22: ruff_python_parser::parser::Parser::parse_single_expression
at ./ruff-main/crates/ruff_python_parser/src/parser/mod.rs:109:32
23: ruff_python_parser::parser::Parser::parse
at ./ruff-main/crates/ruff_python_parser/src/parser/mod.rs:91:38
24: ruff_python_parser::parse_expression
at ./ruff-main/crates/ruff_python_parser/src/lib.rs:141:10
25: ruff_linter::rules::ruff::rules::missing_fstring_syntax::should_be_fstring
at ./ruff-main/crates/ruff_linter/src/rules/ruff/rules/missing_fstring_syntax.rs:188:22
26: ruff_linter::rules::ruff::rules::missing_fstring_syntax::missing_fstring_syntax
at ./ruff-main/crates/ruff_linter/src/rules/ruff/rules/missing_fstring_syntax.rs:118:8
27: ruff_linter::checkers::ast::analyze::expression::expression
at ./ruff-main/crates/ruff_linter/src/checkers/ast/analyze/expression.rs:1646:21
28: <ruff_linter::checkers::ast::Checker as ruff_python_ast::visitor::Visitor>::visit_expr
at ./ruff-main/crates/ruff_linter/src/checkers/ast/mod.rs:2017:9
29: ruff_python_ast::visitor::walk_stmt
at ./ruff-main/crates/ruff_python_ast/src/visitor.rs:207:21
30: <ruff_linter::checkers::ast::Checker as ruff_python_ast::visitor::Visitor>::visit_stmt
at ./ruff-main/crates/ruff_linter/src/checkers/ast/mod.rs:1381:18
31: <ruff_linter::checkers::ast::Checker as ruff_python_ast::visitor::Visitor>::visit_body
at ./ruff-main/crates/ruff_linter/src/checkers/ast/mod.rs:2131:18
32: ruff_linter::checkers::ast::check_ast
at ./ruff-main/crates/ruff_linter/src/checkers/ast/mod.rs:3103:13
33: ruff_linter::linter::check_path
at ./ruff-main/crates/ruff_linter/src/linter.rs:228:39
34: ruff_linter::linter::lint_fix
at ./ruff-main/crates/ruff_linter/src/linter.rs:614:27
35: ruff::diagnostics::lint_path
at ./ruff-main/crates/ruff/src/diagnostics.rs:267:18
36: ruff::commands::check::lint_path::{{closure}}
at ./ruff-main/crates/ruff/src/commands/check.rs:190:9
37: std::panicking::catch_unwind::do_call
at /home/runner/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:589:40
38: __rust_try
39: std::panicking::catch_unwind
at /home/runner/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:552:19
40: std::panic::catch_unwind
at /home/runner/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:359:14
41: ruff_db::panic::catch_unwind
at ./ruff-main/crates/ruff_db/src/panic.rs:122:18
42: ruff::commands::check::lint_path
at ./ruff-main/crates/ruff/src/commands/check.rs:189:18
43: ruff::commands::check::check::{{closure}}
at ./ruff-main/crates/ruff/src/commands/check.rs:94:17
44: <rayon::iter::filter_map::FilterMapFolder<C,P> as rayon::iter::plumbing::Folder<T>>::consume
at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-1.10.0/src/iter/filter_map.rs:123:36
45: rayon::iter::plumbing::Folder::consume_iter
at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-1.10.0/src/iter/plumbing/mod.rs:178:25
46: rayon::iter::plumbing::Producer::fold_with
at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-1.10.0/src/iter/plumbing/mod.rs:109:16
47: rayon::iter::plumbing::bridge_producer_consumer::helper
at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-1.10.0/src/iter/plumbing/mod.rs:437:22
48: rayon::iter::plumbing::bridge_producer_consumer
at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-1.10.0/src/iter/plumbing/mod.rs:396:12
49: <rayon::iter::plumbing::bridge::Callback<C> as rayon::iter::plumbing::ProducerCallback<I>>::callback
at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-1.10.0/src/iter/plumbing/mod.rs:372:13
50: <rayon::slice::Iter<T> as rayon::iter::IndexedParallelIterator>::with_producer
at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-1.10.0/src/slice/mod.rs:826:18
51: rayon::iter::plumbing::bridge
at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-1.10.0/src/iter/plumbing/mod.rs:356:21
52: <rayon::slice::Iter<T> as rayon::iter::ParallelIterator>::drive_unindexed
at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-1.10.0/src/slice/mod.rs:802:9
53: <rayon::iter::filter_map::FilterMap<I,P> as rayon::iter::ParallelIterator>::drive_unindexed
at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-1.10.0/src/iter/filter_map.rs:46:19
54: <rayon::iter::fold::Fold<I,ID,F> as rayon::iter::ParallelIterator>::drive_unindexed
at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-1.10.0/src/iter/fold.rs:59:19
55: rayon::iter::reduce::reduce
at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-1.10.0/src/iter/reduce.rs:15:8
56: rayon::iter::ParallelIterator::reduce
at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-1.10.0/src/iter/mod.rs:998:9
57: ruff::commands::check::check
at ./ruff-main/crates/ruff/src/commands/check.rs:160:10
58: ruff::check
at ./ruff-main/crates/ruff/src/lib.rs:421:13
59: ruff::run
at ./ruff-main/crates/ruff/src/lib.rs:199:33
60: ruff::main
at ./ruff-main/crates/ruff/src/main.rs:45:11
61: core::ops::function::FnOnce::call_once
at /home/runner/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:253:5
62: std::sys::backtrace::__rust_begin_short_backtrace
at /home/runner/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/backtrace.rs:158:18
63: std::rt::lang_start::{{closure}}
at /home/runner/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/rt.rs:206:18
64: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once
at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library/core/src/ops/function.rs:290:21
65: std::panicking::catch_unwind::do_call
at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library/std/src/panicking.rs:589:40
66: std::panicking::catch_unwind
at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library/std/src/panicking.rs:552:19
67: std::panic::catch_unwind
at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library/std/src/panic.rs:359:14
68: std::rt::lang_start_internal::{{closure}}
at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library/std/src/rt.rs:175:24
69: std::panicking::catch_unwind::do_call
at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library/std/src/panicking.rs:589:40
70: std::panicking::catch_unwind
at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library/std/src/panicking.rs:552:19
71: std::panic::catch_unwind
at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library/std/src/panic.rs:359:14
72: std::rt::lang_start_internal
at /rustc/f34ba774c78ea32b7c40598b8ad23e75cdac42a6/library/std/src/rt.rs:171:5
73: std::rt::lang_start
at /home/runner/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/rt.rs:205:5
74: <unknown>
75: __libc_start_main
76: _start
##### Automatic Fuzzer note, output status "Some(0)", output signal "None"