ICE: Special char (like RTL(U+202E)) in comment for value in `vec!` would cause ICE if not add `#[allow(text_direction_codepoint_in_literal)]`

[wychlw]

Code

// #[allow(text_direction_codepoint_in_literal)]
fn main() {
    let t = vec![
        /// ‮test⁦ RTL in doc in vec!
        //  ICE (Sadly)
        1
    ];
}

Note: the string comment is: \u+202e test \u+2066 RTL in doc in vec!

And actually if you ADD the #[allow(text_direction_codepoint_in_literal)], ICE would disappear.
However, I think with out it should get a error just like other situation has a special character, instead of an ICE directly?

Meta

rustc --version --verbose:

rustc 1.88.0-nightly (d7ea436a0 2025-04-24)
binary: rustc
commit-hash: d7ea436a02d5de4033fcf7fd4eb8ed965d0f574c
commit-date: 2025-04-24
host: x86_64-unknown-linux-gnu
release: 1.88.0-nightly
LLVM version: 20.1.2

Error output

thread 'rustc' panicked at compiler/rustc_span/src/lib.rs:2252:17:
assertion failed: bpos.to_u32() >= mbc.pos.to_u32() + mbc.bytes as u32
...
query stack during panic:
#0 [early_lint_checks] perform lints prior to AST lowering
#1 [hir_crate] getting the crate HIR
#2 [opt_hir_owner_nodes] getting HIR owner items in ``
#3 [hir_crate_items] getting HIR crate items
#4 [proc_macro_decls_static] looking up the proc macro declarations for a crate
#5 [analysis] running analysis passes on this crate
end of query stack

Backtrace

warning: unused doc comment
 --> results/3.rs:4:9
  |
4 |         /// �test� RTL in doc in vec!
  |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
5 |         //  ICE (Sadly)
6 |         1
  |         - rustdoc does not generate documentation for expressions
  |
  = help: use `//` for a plain comment
  = note: `#[warn(unused_doc_comments)]` on by default


thread 'rustc' panicked at compiler/rustc_span/src/lib.rs:2252:17:
assertion failed: bpos.to_u32() >= mbc.pos.to_u32() + mbc.bytes as u32
stack backtrace:
   0:     0x74e8bf700af3 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h904445fd43971ac2
   1:     0x74e8bfe05ac7 - core::fmt::write::haf953ebbe9ae3b8f
   2:     0x74e8c11ed151 - std::io::Write::write_fmt::hf56a31f7c729c1eb
   3:     0x74e8bf700952 - std::sys::backtrace::BacktraceLock::print::ha4c7301f21e048e8
   4:     0x74e8bf7042ca - std::panicking::default_hook::{{closure}}::hdf738965590aed1b
   5:     0x74e8bf703e4f - std::panicking::default_hook::ha27c43c4ffc1fe90
   6:     0x74e8be774973 - std[da27df0714dc5aa6]::panicking::update_hook::<alloc[4e641192740d77f8]::boxed::Box<rustc_driver_impl[aa060002af73b10]::install_ice_hook::{closure#1}>>::{closure#0}
   7:     0x74e8bf704b43 - std::panicking::rust_panic_with_hook::h0b6c03f2b60724f5
   8:     0x74e8bf704806 - std::panicking::begin_panic_handler::{{closure}}::hbce440c8d6435cba
   9:     0x74e8bf700fb9 - std::sys::backtrace::__rust_end_short_backtrace::h6024a3502da9a7e6
  10:     0x74e8bf7044fd - __rustc[b94488cf790a175f]::rust_begin_unwind
  11:     0x74e8bc08c7d0 - core::panicking::panic_fmt::hcfb4f56b51bd6104
  12:     0x74e8bc0913ac - core::panicking::panic::h806b26c9718f2945
  13:     0x74e8c074db65 - <rustc_span[697d8df8862c8d77]::source_map::SourceMap>::lookup_char_pos
  14:     0x74e8c074a50f - <rustc_errors[cee55832778cbb75]::emitter::HumanEmitter>::get_multispan_max_line_num
  15:     0x74e8c0752f82 - <rustc_errors[cee55832778cbb75]::emitter::HumanEmitter as rustc_errors[cee55832778cbb75]::emitter::Emitter>::emit_diagnostic
  16:     0x74e8c0dea668 - <rustc_errors[cee55832778cbb75]::DiagCtxtInner>::emit_diagnostic::{closure#3}
  17:     0x74e8c0decf5d - rustc_interface[1c505902b33a67ab]::callbacks::track_diagnostic::<core[3597e8473f983ff]::option::Option<rustc_span[697d8df8862c8d77]::ErrorGuaranteed>>
  18:     0x74e8c0debba6 - <rustc_errors[cee55832778cbb75]::DiagCtxtInner>::emit_diagnostic
  19:     0x74e8c0deba79 - <rustc_errors[cee55832778cbb75]::DiagCtxtHandle>::emit_diagnostic
  20:     0x74e8c0deb915 - <() as rustc_errors[cee55832778cbb75]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  21:     0x74e8c038fbc4 - rustc_middle[79325ec0783d6836]::lint::lint_level::lint_level_impl
  22:     0x74e8becd2069 - <rustc_lint[e0647b199692e64d]::hidden_unicode_codepoints::HiddenUnicodeCodepoints>::lint_text_direction_codepoint
  23:     0x74e8bc38c45b - <rustc_lint[e0647b199692e64d]::BuiltinCombinedEarlyLintPass as rustc_lint[e0647b199692e64d]::passes::EarlyLintPass>::check_expr
  24:     0x74e8bfea6903 - <rustc_lint[e0647b199692e64d]::early::EarlyContextAndPass<rustc_lint[e0647b199692e64d]::BuiltinCombinedEarlyLintPass>>::with_lint_attrs::<<rustc_lint[e0647b199692e64d]::early::EarlyContextAndPass<rustc_lint[e0647b199692e64d]::BuiltinCombinedEarlyLintPass> as rustc_ast[c70a88a4ab5e43d5]::visit::Visitor>::visit_expr::{closure#0}>
  25:     0x74e8bfea7750 - <rustc_lint[e0647b199692e64d]::early::EarlyContextAndPass<rustc_lint[e0647b199692e64d]::BuiltinCombinedEarlyLintPass>>::with_lint_attrs::<<rustc_lint[e0647b199692e64d]::early::EarlyContextAndPass<rustc_lint[e0647b199692e64d]::BuiltinCombinedEarlyLintPass> as rustc_ast[c70a88a4ab5e43d5]::visit::Visitor>::visit_expr::{closure#0}>
  26:     0x74e8bfea6d05 - <rustc_lint[e0647b199692e64d]::early::EarlyContextAndPass<rustc_lint[e0647b199692e64d]::BuiltinCombinedEarlyLintPass>>::with_lint_attrs::<<rustc_lint[e0647b199692e64d]::early::EarlyContextAndPass<rustc_lint[e0647b199692e64d]::BuiltinCombinedEarlyLintPass> as rustc_ast[c70a88a4ab5e43d5]::visit::Visitor>::visit_expr::{closure#0}>
  27:     0x74e8bfea6a49 - <rustc_lint[e0647b199692e64d]::early::EarlyContextAndPass<rustc_lint[e0647b199692e64d]::BuiltinCombinedEarlyLintPass>>::with_lint_attrs::<<rustc_lint[e0647b199692e64d]::early::EarlyContextAndPass<rustc_lint[e0647b199692e64d]::BuiltinCombinedEarlyLintPass> as rustc_ast[c70a88a4ab5e43d5]::visit::Visitor>::visit_expr::{closure#0}>
  28:     0x74e8bfea6a49 - <rustc_lint[e0647b199692e64d]::early::EarlyContextAndPass<rustc_lint[e0647b199692e64d]::BuiltinCombinedEarlyLintPass>>::with_lint_attrs::<<rustc_lint[e0647b199692e64d]::early::EarlyContextAndPass<rustc_lint[e0647b199692e64d]::BuiltinCombinedEarlyLintPass> as rustc_ast[c70a88a4ab5e43d5]::visit::Visitor>::visit_expr::{closure#0}>
  29:     0x74e8bfea8914 - <rustc_lint[e0647b199692e64d]::early::EarlyContextAndPass<rustc_lint[e0647b199692e64d]::BuiltinCombinedEarlyLintPass> as rustc_ast[c70a88a4ab5e43d5]::visit::Visitor>::visit_block
  30:     0x74e8bfeac111 - <rustc_lint[e0647b199692e64d]::early::EarlyContextAndPass<rustc_lint[e0647b199692e64d]::BuiltinCombinedEarlyLintPass> as rustc_ast[c70a88a4ab5e43d5]::visit::Visitor>::visit_fn
  31:     0x74e8bfeafc22 - rustc_ast[c70a88a4ab5e43d5]::visit::walk_item_ctxt::<rustc_lint[e0647b199692e64d]::early::EarlyContextAndPass<rustc_lint[e0647b199692e64d]::BuiltinCombinedEarlyLintPass>, rustc_ast[c70a88a4ab5e43d5]::ast::ItemKind>
  32:     0x74e8bfeaf4af - <rustc_lint[e0647b199692e64d]::early::EarlyContextAndPass<rustc_lint[e0647b199692e64d]::BuiltinCombinedEarlyLintPass> as rustc_ast[c70a88a4ab5e43d5]::visit::Visitor>::visit_item
  33:     0x74e8c05268a8 - rustc_interface[1c505902b33a67ab]::passes::early_lint_checks
  34:     0x74e8c052610d - rustc_query_impl[20a6bea039ee1f44]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[20a6bea039ee1f44]::query_impl::early_lint_checks::dynamic_query::{closure#2}::{closure#0}, rustc_middle[79325ec0783d6836]::query::erase::Erased<[u8; 0usize]>>
  35:     0x74e8c0d5bd7d - rustc_query_system[ec6c378d7b3d9aa4]::query::plumbing::try_execute_query::<rustc_query_impl[20a6bea039ee1f44]::DynamicConfig<rustc_query_system[ec6c378d7b3d9aa4]::query::caches::SingleCache<rustc_middle[79325ec0783d6836]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[20a6bea039ee1f44]::plumbing::QueryCtxt, false>
  36:     0x74e8c0d5bafa - rustc_query_impl[20a6bea039ee1f44]::query_impl::early_lint_checks::get_query_non_incr::__rust_end_short_backtrace
  37:     0x74e8c036a2d2 - rustc_ast_lowering[ca3ab2546c6ae290]::lower_to_hir
  38:     0x74e8c0d5b2e4 - rustc_query_impl[20a6bea039ee1f44]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[20a6bea039ee1f44]::query_impl::hir_crate::dynamic_query::{closure#2}::{closure#0}, rustc_middle[79325ec0783d6836]::query::erase::Erased<[u8; 8usize]>>
  39:     0x74e8c0d5db04 - rustc_query_system[ec6c378d7b3d9aa4]::query::plumbing::try_execute_query::<rustc_query_impl[20a6bea039ee1f44]::DynamicConfig<rustc_query_system[ec6c378d7b3d9aa4]::query::caches::SingleCache<rustc_middle[79325ec0783d6836]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[20a6bea039ee1f44]::plumbing::QueryCtxt, false>
  40:     0x74e8c0d5d8df - rustc_query_impl[20a6bea039ee1f44]::query_impl::hir_crate::get_query_non_incr::__rust_end_short_backtrace
  41:     0x74e8c01879f6 - rustc_query_impl[20a6bea039ee1f44]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[20a6bea039ee1f44]::query_impl::opt_hir_owner_nodes::dynamic_query::{closure#2}::{closure#0}, rustc_middle[79325ec0783d6836]::query::erase::Erased<[u8; 8usize]>>
  42:     0x74e8c0186aac - rustc_query_system[ec6c378d7b3d9aa4]::query::plumbing::try_execute_query::<rustc_query_impl[20a6bea039ee1f44]::DynamicConfig<rustc_data_structures[8818201305a26393]::vec_cache::VecCache<rustc_span[697d8df8862c8d77]::def_id::LocalDefId, rustc_middle[79325ec0783d6836]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[ec6c378d7b3d9aa4]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[20a6bea039ee1f44]::plumbing::QueryCtxt, false>
  43:     0x74e8c018674d - rustc_query_impl[20a6bea039ee1f44]::query_impl::opt_hir_owner_nodes::get_query_non_incr::__rust_end_short_backtrace
  44:     0x74e8c09152ae - <rustc_middle[79325ec0783d6836]::ty::context::TyCtxt>::expect_hir_owner_nodes
  45:     0x74e8c018d07c - rustc_middle[79325ec0783d6836]::hir::map::hir_crate_items
  46:     0x74e8c0c4845d - rustc_query_impl[20a6bea039ee1f44]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[20a6bea039ee1f44]::query_impl::hir_crate_items::dynamic_query::{closure#2}::{closure#0}, rustc_middle[79325ec0783d6836]::query::erase::Erased<[u8; 8usize]>>
  47:     0x74e8c0d5db04 - rustc_query_system[ec6c378d7b3d9aa4]::query::plumbing::try_execute_query::<rustc_query_impl[20a6bea039ee1f44]::DynamicConfig<rustc_query_system[ec6c378d7b3d9aa4]::query::caches::SingleCache<rustc_middle[79325ec0783d6836]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[20a6bea039ee1f44]::plumbing::QueryCtxt, false>
  48:     0x74e8c0d5d41f - rustc_query_impl[20a6bea039ee1f44]::query_impl::hir_crate_items::get_query_non_incr::__rust_end_short_backtrace
  49:     0x74e8c03968cb - rustc_interface[1c505902b33a67ab]::proc_macro_decls::proc_macro_decls_static
  50:     0x74e8c10863b5 - rustc_query_impl[20a6bea039ee1f44]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[20a6bea039ee1f44]::query_impl::proc_macro_decls_static::dynamic_query::{closure#2}::{closure#0}, rustc_middle[79325ec0783d6836]::query::erase::Erased<[u8; 4usize]>>
  51:     0x74e8c1085f84 - rustc_query_system[ec6c378d7b3d9aa4]::query::plumbing::try_execute_query::<rustc_query_impl[20a6bea039ee1f44]::DynamicConfig<rustc_query_system[ec6c378d7b3d9aa4]::query::caches::SingleCache<rustc_middle[79325ec0783d6836]::query::erase::Erased<[u8; 4usize]>>, false, false, false>, rustc_query_impl[20a6bea039ee1f44]::plumbing::QueryCtxt, false>
  52:     0x74e8c1085d74 - rustc_query_impl[20a6bea039ee1f44]::query_impl::proc_macro_decls_static::get_query_non_incr::__rust_end_short_backtrace
  53:     0x74e8c0909b90 - rustc_interface[1c505902b33a67ab]::passes::run_required_analyses
  54:     0x74e8c0a6aede - rustc_interface[1c505902b33a67ab]::passes::analysis
  55:     0x74e8c0a6aeb3 - rustc_query_impl[20a6bea039ee1f44]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[20a6bea039ee1f44]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[79325ec0783d6836]::query::erase::Erased<[u8; 0usize]>>
  56:     0x74e8c0d5bd7d - rustc_query_system[ec6c378d7b3d9aa4]::query::plumbing::try_execute_query::<rustc_query_impl[20a6bea039ee1f44]::DynamicConfig<rustc_query_system[ec6c378d7b3d9aa4]::query::caches::SingleCache<rustc_middle[79325ec0783d6836]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[20a6bea039ee1f44]::plumbing::QueryCtxt, false>
  57:     0x74e8c0d5ba78 - rustc_query_impl[20a6bea039ee1f44]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  58:     0x74e8c109a3c0 - rustc_interface[1c505902b33a67ab]::passes::create_and_enter_global_ctxt::<core[3597e8473f983ff]::option::Option<rustc_interface[1c505902b33a67ab]::queries::Linker>, rustc_driver_impl[aa060002af73b10]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
  59:     0x74e8c0ecc604 - rustc_interface[1c505902b33a67ab]::interface::run_compiler::<(), rustc_driver_impl[aa060002af73b10]::run_compiler::{closure#0}>::{closure#1}
  60:     0x74e8c0eacdf4 - std[da27df0714dc5aa6]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[1c505902b33a67ab]::util::run_in_thread_with_globals<rustc_interface[1c505902b33a67ab]::util::run_in_thread_pool_with_globals<rustc_interface[1c505902b33a67ab]::interface::run_compiler<(), rustc_driver_impl[aa060002af73b10]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  61:     0x74e8c0ead234 - <<std[da27df0714dc5aa6]::thread::Builder>::spawn_unchecked_<rustc_interface[1c505902b33a67ab]::util::run_in_thread_with_globals<rustc_interface[1c505902b33a67ab]::util::run_in_thread_pool_with_globals<rustc_interface[1c505902b33a67ab]::interface::run_compiler<(), rustc_driver_impl[aa060002af73b10]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[3597e8473f983ff]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  62:     0x74e8c0eae62b - std::sys::pal::unix::thread::Thread::new::thread_start::h7c46323428199a20
  63:     0x74e8baca3708 - <unknown>
  64:     0x74e8bad27aac - <unknown>
  65:                0x0 - <unknown>

error: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: please make sure that you have updated to the latest nightly

note: rustc 1.88.0-nightly (d7ea436a0 2025-04-24) running on x86_64-unknown-linux-gnu

note: compiler flags: -C opt-level=3 -Z no-codegen -Z mir-opt-level=4 -Z validate-mir --crate-type lib

query stack during panic:
#0 [early_lint_checks] perform lints prior to AST lowering
#1 [hir_crate] getting the crate HIR
#2 [opt_hir_owner_nodes] getting HIR owner items in ``
#3 [hir_crate_items] getting HIR crate items
#4 [proc_macro_decls_static] looking up the proc macro declarations for a crate
#5 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 1 previous error; 1 warning emitted

[theemathas]

ICE also occurs with user-defined macro_rules:

macro_rules! foo {
    ($x:expr) => { $x }
}

fn main() {
    foo!(
        /// ‮test⁦ RTL in doc in macro
        1
    );
}