ICE failed to unescape char literal

snippet:

fn a() {
   'ab
}

Version information

rustc 1.77.0-nightly (e7bbe8ce9 2024-01-26)
binary: rustc
commit-hash: e7bbe8ce933123a8e327c79e38bcb790595e6a65
commit-date: 2024-01-26
host: x86_64-unknown-linux-gnu
release: 1.77.0-nightly
LLVM version: 17.0.6

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc

Program output

error: expected `while`, `for`, `loop` or `{` after a label
 --> /tmp/icemaker_global_tempdir.awRLrWEr9xBk/rustc_testrunner_tmpdir_reporting.AYMxBOFwCLUT/mvce.rs:3:1
  |
3 | } 
  | ^ expected `while`, `for`, `loop` or `{` after a label
  |
help: add `'` to close the char literal
  |
2 |    'ab'
  |       +

thread 'rustc' panicked at compiler/rustc_ast/src/util/literal.rs:66:34:
failed to unescape char literal
stack backtrace:
   0:     0x7f6d4e98bf86 - std::backtrace_rs::backtrace::libunwind::trace::h514ead2753e1782f
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f6d4e98bf86 - std::backtrace_rs::backtrace::trace_unsynchronized::hbc462e8372651887
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f6d4e98bf86 - std::sys_common::backtrace::_print_fmt::he3092ef183bdd613
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f6d4e98bf86 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h908f80a389799910
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f6d4e9de880 - core::fmt::rt::Argument::fmt::ha9f3d8b02e25296c
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/core/src/fmt/rt.rs:142:9
   5:     0x7f6d4e9de880 - core::fmt::write::hef880bc86bd63d4b
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/core/src/fmt/mod.rs:1120:17
   6:     0x7f6d4e97f94f - std::io::Write::write_fmt::h780869503f755b5a
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/std/src/io/mod.rs:1810:15
   7:     0x7f6d4e98bd64 - std::sys_common::backtrace::_print::h52cc78326ec17ac5
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f6d4e98bd64 - std::sys_common::backtrace::print::h44b4c057fd1c7c3f
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f6d4e98eaf7 - std::panicking::default_hook::{{closure}}::h99cbf699c09f8685
  10:     0x7f6d4e98e859 - std::panicking::default_hook::hbc89d54398681576
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/std/src/panicking.rs:292:9
  11:     0x7f6d5174acec - std[1d0ea5b5e602c844]::panicking::update_hook::<alloc[d84df3010862da1b]::boxed::Box<rustc_driver_impl[2078f68ece4ea2b8]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f6d4e98f246 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h99950b3f8a1ddee8
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/alloc/src/boxed.rs:2029:9
  13:     0x7f6d4e98f246 - std::panicking::rust_panic_with_hook::he160495ec53b11e6
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/std/src/panicking.rs:785:13
  14:     0x7f6d4e98ef59 - std::panicking::begin_panic_handler::{{closure}}::ha86f6320ad4cac49
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/std/src/panicking.rs:651:13
  15:     0x7f6d4e98c486 - std::sys_common::backtrace::__rust_end_short_backtrace::h19c3911246e5b7ea
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7f6d4e98ece4 - rust_begin_unwind
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/std/src/panicking.rs:647:5
  17:     0x7f6d4e9daf85 - core::panicking::panic_fmt::hd869deda4756f0c1
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/core/src/panicking.rs:72:14
  18:     0x7f6d52b3f9cd - <rustc_ast[a2e9ff0ff4e44aed]::ast::LitKind>::from_token_lit
  19:     0x7f6d52c0b224 - <rustc_ast_lowering[10dbbff99856d352]::LoweringContext>::lower_expr_mut
  20:     0x7f6d53348ddf - <rustc_ast_lowering[10dbbff99856d352]::LoweringContext>::lower_block_noalloc
  21:     0x7f6d5334361f - <rustc_ast_lowering[10dbbff99856d352]::LoweringContext>::lower_maybe_coroutine_body
  22:     0x7f6d537c4e48 - <rustc_ast_lowering[10dbbff99856d352]::LoweringContext>::lower_item_kind
  23:     0x7f6d52da6151 - <rustc_ast_lowering[10dbbff99856d352]::item::ItemLowerer>::lower_node
  24:     0x7f6d537ad9bb - rustc_ast_lowering[10dbbff99856d352]::lower_to_hir
  25:     0x7f6d537ad124 - rustc_query_impl[210ae1d54e37601d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[210ae1d54e37601d]::query_impl::hir_crate::dynamic_query::{closure#2}::{closure#0}, rustc_middle[89c572df7d816277]::query::erase::Erased<[u8; 8usize]>>
  26:     0x7f6d537ab2f2 - rustc_query_system[2f3cbd302947754a]::query::plumbing::try_execute_query::<rustc_query_impl[210ae1d54e37601d]::DynamicConfig<rustc_query_system[2f3cbd302947754a]::query::caches::SingleCache<rustc_middle[89c572df7d816277]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[210ae1d54e37601d]::plumbing::QueryCtxt, false>
  27:     0x7f6d537aae46 - rustc_query_impl[210ae1d54e37601d]::query_impl::hir_crate::get_query_non_incr::__rust_end_short_backtrace
  28:     0x7f6d52b8ab9f - rustc_query_impl[210ae1d54e37601d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[210ae1d54e37601d]::query_impl::hir_attrs::dynamic_query::{closure#2}::{closure#0}, rustc_middle[89c572df7d816277]::query::erase::Erased<[u8; 8usize]>>
  29:     0x7f6d52b8a127 - rustc_query_system[2f3cbd302947754a]::query::plumbing::try_execute_query::<rustc_query_impl[210ae1d54e37601d]::DynamicConfig<rustc_query_system[2f3cbd302947754a]::query::caches::VecCache<rustc_hir[95673764c296ef68]::hir_id::OwnerId, rustc_middle[89c572df7d816277]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[210ae1d54e37601d]::plumbing::QueryCtxt, false>
  30:     0x7f6d52b89e8d - rustc_query_impl[210ae1d54e37601d]::query_impl::hir_attrs::get_query_non_incr::__rust_end_short_backtrace
  31:     0x7f6d52a58534 - <rustc_middle[89c572df7d816277]::hir::map::Map>::attrs
  32:     0x7f6d537a87c1 - rustc_passes[84bfad27b65c8e42]::entry::entry_fn
  33:     0x7f6d537a8766 - rustc_query_impl[210ae1d54e37601d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[210ae1d54e37601d]::query_impl::entry_fn::dynamic_query::{closure#2}::{closure#0}, rustc_middle[89c572df7d816277]::query::erase::Erased<[u8; 12usize]>>
  34:     0x7f6d537a8749 - <rustc_query_impl[210ae1d54e37601d]::query_impl::entry_fn::dynamic_query::{closure#2} as core[1eaf6a36b93e3ccb]::ops::function::FnOnce<(rustc_middle[89c572df7d816277]::ty::context::TyCtxt, ())>>::call_once
  35:     0x7f6d537a8049 - rustc_query_system[2f3cbd302947754a]::query::plumbing::try_execute_query::<rustc_query_impl[210ae1d54e37601d]::DynamicConfig<rustc_query_system[2f3cbd302947754a]::query::caches::SingleCache<rustc_middle[89c572df7d816277]::query::erase::Erased<[u8; 12usize]>>, false, false, false>, rustc_query_impl[210ae1d54e37601d]::plumbing::QueryCtxt, false>
  36:     0x7f6d537a7e13 - rustc_query_impl[210ae1d54e37601d]::query_impl::entry_fn::get_query_non_incr::__rust_end_short_backtrace
  37:     0x7f6d53353555 - rustc_interface[567ccd780f164b19]::passes::analysis
  38:     0x7f6d5335345f - rustc_query_impl[210ae1d54e37601d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[210ae1d54e37601d]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[89c572df7d816277]::query::erase::Erased<[u8; 1usize]>>
  39:     0x7f6d536c7bb2 - rustc_query_system[2f3cbd302947754a]::query::plumbing::try_execute_query::<rustc_query_impl[210ae1d54e37601d]::DynamicConfig<rustc_query_system[2f3cbd302947754a]::query::caches::SingleCache<rustc_middle[89c572df7d816277]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[210ae1d54e37601d]::plumbing::QueryCtxt, false>
  40:     0x7f6d536c7915 - rustc_query_impl[210ae1d54e37601d]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  41:     0x7f6d53741633 - rustc_interface[567ccd780f164b19]::interface::run_compiler::<core[1eaf6a36b93e3ccb]::result::Result<(), rustc_span[950276472281dfd0]::ErrorGuaranteed>, rustc_driver_impl[2078f68ece4ea2b8]::run_compiler::{closure#0}>::{closure#0}
  42:     0x7f6d539cf306 - std[1d0ea5b5e602c844]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[567ccd780f164b19]::util::run_in_thread_with_globals<rustc_interface[567ccd780f164b19]::util::run_in_thread_pool_with_globals<rustc_interface[567ccd780f164b19]::interface::run_compiler<core[1eaf6a36b93e3ccb]::result::Result<(), rustc_span[950276472281dfd0]::ErrorGuaranteed>, rustc_driver_impl[2078f68ece4ea2b8]::run_compiler::{closure#0}>::{closure#0}, core[1eaf6a36b93e3ccb]::result::Result<(), rustc_span[950276472281dfd0]::ErrorGuaranteed>>::{closure#0}, core[1eaf6a36b93e3ccb]::result::Result<(), rustc_span[950276472281dfd0]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[1eaf6a36b93e3ccb]::result::Result<(), rustc_span[950276472281dfd0]::ErrorGuaranteed>>
  43:     0x7f6d539cf133 - <<std[1d0ea5b5e602c844]::thread::Builder>::spawn_unchecked_<rustc_interface[567ccd780f164b19]::util::run_in_thread_with_globals<rustc_interface[567ccd780f164b19]::util::run_in_thread_pool_with_globals<rustc_interface[567ccd780f164b19]::interface::run_compiler<core[1eaf6a36b93e3ccb]::result::Result<(), rustc_span[950276472281dfd0]::ErrorGuaranteed>, rustc_driver_impl[2078f68ece4ea2b8]::run_compiler::{closure#0}>::{closure#0}, core[1eaf6a36b93e3ccb]::result::Result<(), rustc_span[950276472281dfd0]::ErrorGuaranteed>>::{closure#0}, core[1eaf6a36b93e3ccb]::result::Result<(), rustc_span[950276472281dfd0]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[1eaf6a36b93e3ccb]::result::Result<(), rustc_span[950276472281dfd0]::ErrorGuaranteed>>::{closure#1} as core[1eaf6a36b93e3ccb]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  44:     0x7f6d4e998835 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hba0b80fd74ce5417
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/alloc/src/boxed.rs:2015:9
  45:     0x7f6d4e998835 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h0ab2d213dcdff51c
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/alloc/src/boxed.rs:2015:9
  46:     0x7f6d4e998835 - std::sys::pal::unix::thread::Thread::new::thread_start::h7eeca5a8e186b7ad
                               at /rustc/e7bbe8ce933123a8e327c79e38bcb790595e6a65/library/std/src/sys/pal/unix/thread.rs:108:17
  47:     0x7f6d4e7849eb - <unknown>
  48:     0x7f6d4e8087cc - <unknown>
  49:                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: rustc 1.77.0-nightly (e7bbe8ce9 2024-01-26) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [hir_crate] getting the crate HIR
#1 [hir_attrs] getting HIR owner attributes in ``
#2 [entry_fn] looking up the entry function of a crate
#3 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 1 previous error

@nnethercote

The assertion was added in #120329 cc @nnethercote

It's Saturday here, I'll fix it on Monday.

Be more careful about interpreting a label as a mistyped char literal.

Be more careful about interpreting a label/lifetime as a mistyped cha…

Rollup merge of rust-lang#120460 - nnethercote:fix-120397, r=compiler…

Unrolled build for rust-lang#120460

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ICE `failed to unescape char literal` #120397

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ICE failed to unescape char literal #120397

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matthiaskrgr commented on Jan 26, 2024

nnethercote commented on Jan 26, 2024

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ICE `failed to unescape char literal` #120397