Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

internal error: entered unreachable code: in literal form when lowering mac args eq #96847

Closed
Badel2 opened this issue May 8, 2022 · 3 comments · Fixed by #100426
Closed
Labels
C-bug Category: This is a bug. glacier ICE tracked in rust-lang/glacier. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

Comments

@Badel2
Copy link
Contributor

Badel2 commented May 8, 2022

I'm seeing an internal compiler error on the following input, found by fuzz-rustc:

Code

fn main() {
    for _ in [] {
        #![doc=""]
    }
}

Error output

   Compiling playground v0.0.1 (/playground)
warning: unused doc comment
 --> src/main.rs:3:9
  |
2 | /     for _ in [] {
3 | |         #![doc=""]
  | |         ^^^^^^^^^^
4 | |     }
  | |_____- rustdoc does not generate documentation for expressions
  |
  = note: `#[warn(unused_doc_comments)]` on by default
  = help: use `//` for a plain comment

thread 'rustc' panicked at 'internal error: entered unreachable code: in literal form when lowering mac args eq: Lit { token: Lit { kind: Str, symbol: "", suffix: None }, kind: Str("", Cooked), span: src/main.rs:3:16: 3:18 (#0) }', compiler/rustc_ast_lowering/src/lib.rs:903:17

This is not unique to doc attributes, it can be replaced by any other name, but I used doc in the example because I know it is imported by default. Affected versions: nightly 2022-05-07 is affected, but beta 1.61.0-beta.5 and stable 1.60.0 are not affected

Backtrace

   Compiling playground v0.0.1 (/playground)
warning: unused doc comment
 --> src/main.rs:3:9
  |
2 | /     for _ in [] {
3 | |         #![doc=""]
  | |         ^^^^^^^^^^
4 | |     }
  | |_____- rustdoc does not generate documentation for expressions
  |
  = note: `#[warn(unused_doc_comments)]` on by default
  = help: use `//` for a plain comment

thread 'rustc' panicked at 'internal error: entered unreachable code: in literal form when lowering mac args eq: Lit { token: Lit { kind: Str, symbol: "", suffix: None }, kind: Str("", Cooked), span: src/main.rs:3:16: 3:18 (#0) }', compiler/rustc_ast_lowering/src/lib.rs:903:17
stack backtrace:
   0:     0x7f7565767ead - std::backtrace_rs::backtrace::libunwind::trace::ha82e355503b775ae
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f7565767ead - std::backtrace_rs::backtrace::trace_unsynchronized::h8e110267c4bde050
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f7565767ead - std::sys_common::backtrace::_print_fmt::h5f563af01e258275
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7f7565767ead - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hea5b1fa30c1333eb
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7f75657c3b6c - core::fmt::write::h82dfb1eb62467416
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/core/src/fmt/mod.rs:1194:17
   5:     0x7f75657595a1 - std::io::Write::write_fmt::h453cda435b3f142f
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/std/src/io/mod.rs:1655:15
   6:     0x7f756576abc5 - std::sys_common::backtrace::_print::hc8f28f28ca4dc2eb
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7f756576abc5 - std::sys_common::backtrace::print::he50667b6c89ab0df
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7f756576abc5 - std::panicking::default_hook::{{closure}}::hefe4dc9c157160a4
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/std/src/panicking.rs:295:22
   9:     0x7f756576a839 - std::panicking::default_hook::h1376b5b10508fdef
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/std/src/panicking.rs:314:9
  10:     0x7f7565f2bee1 - rustc_driver[5234e93807a03500]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f756576b396 - std::panicking::rust_panic_with_hook::h839908001643daf0
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/std/src/panicking.rs:702:17
  12:     0x7f756576b197 - std::panicking::begin_panic_handler::{{closure}}::hf027c1af338d28cd
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/std/src/panicking.rs:588:13
  13:     0x7f7565768364 - std::sys_common::backtrace::__rust_end_short_backtrace::h42726b9619ec7247
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/std/src/sys_common/backtrace.rs:138:18
  14:     0x7f756576aec9 - rust_begin_unwind
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/std/src/panicking.rs:584:5
  15:     0x7f7565730193 - core::panicking::panic_fmt::hecbeff60ca345ea1
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/core/src/panicking.rs:142:14
  16:     0x7f7567621501 - <smallvec[783a7bc302c18e9d]::SmallVec<[rustc_ast[8c13dfba7c39903e]::ast::Attribute; 8usize]> as core[6c67f8de41fca20a]::iter::traits::collect::Extend<rustc_ast[8c13dfba7c39903e]::ast::Attribute>>::extend::<core[6c67f8de41fca20a]::iter::adapters::map::Map<core[6c67f8de41fca20a]::slice::iter::Iter<rustc_ast[8c13dfba7c39903e]::ast::Attribute>, <rustc_ast_lowering[840f68559e06d09a]::LoweringContext>::lower_attrs::{closure#0}>>
  17:     0x7f75675f03ee - <rustc_ast_lowering[840f68559e06d09a]::LoweringContext>::expr
  18:     0x7f75682f17c2 - <rustc_ast_lowering[840f68559e06d09a]::LoweringContext>::lower_expr_for
  19:     0x7f75675ebbfe - <rustc_ast_lowering[840f68559e06d09a]::LoweringContext>::lower_expr_mut::{closure#0}
  20:     0x7f75675e80f2 - <rustc_ast_lowering[840f68559e06d09a]::LoweringContext>::lower_stmts
  21:     0x7f75675f401d - <rustc_ast_lowering[840f68559e06d09a]::LoweringContext>::lower_maybe_async_body
  22:     0x7f7567604da8 - <rustc_ast_lowering[840f68559e06d09a]::LoweringContext>::with_hir_id_owner::<<rustc_ast_lowering[840f68559e06d09a]::item::ItemLowerer>::with_lctx<<rustc_ast_lowering[840f68559e06d09a]::item::ItemLowerer>::lower_item::{closure#0}>::{closure#0}>
  23:     0x7f756762ad99 - <rustc_ast_lowering[840f68559e06d09a]::item::ItemLowerer>::lower_node
  24:     0x7f7567603adc - rustc_ast_lowering[840f68559e06d09a]::lower_crate
  25:     0x7f7567fdac17 - <rustc_interface[259f7f2d687dc9cd]::passes::boxed_resolver::BoxedResolver>::access::<rustc_interface[259f7f2d687dc9cd]::passes::create_global_ctxt::{closure#0}, &rustc_hir[a682107990697923]::hir::Crate>
  26:     0x7f7567fd0e43 - rustc_interface[259f7f2d687dc9cd]::passes::create_global_ctxt
  27:     0x7f7567ff415d - <rustc_interface[259f7f2d687dc9cd]::queries::Queries>::global_ctxt
  28:     0x7f7567f9d172 - <rustc_interface[259f7f2d687dc9cd]::interface::Compiler>::enter::<rustc_driver[5234e93807a03500]::run_compiler::{closure#1}::{closure#2}, core[6c67f8de41fca20a]::result::Result<core[6c67f8de41fca20a]::option::Option<rustc_interface[259f7f2d687dc9cd]::queries::Linker>, rustc_errors[473276f074908285]::ErrorGuaranteed>>
  29:     0x7f7567fc559f - rustc_span[e19c93a5cc4d231b]::with_source_map::<core[6c67f8de41fca20a]::result::Result<(), rustc_errors[473276f074908285]::ErrorGuaranteed>, rustc_interface[259f7f2d687dc9cd]::interface::create_compiler_and_run<core[6c67f8de41fca20a]::result::Result<(), rustc_errors[473276f074908285]::ErrorGuaranteed>, rustc_driver[5234e93807a03500]::run_compiler::{closure#1}>::{closure#1}>
  30:     0x7f7567f9df44 - rustc_interface[259f7f2d687dc9cd]::interface::create_compiler_and_run::<core[6c67f8de41fca20a]::result::Result<(), rustc_errors[473276f074908285]::ErrorGuaranteed>, rustc_driver[5234e93807a03500]::run_compiler::{closure#1}>
  31:     0x7f7567f9b6f2 - <scoped_tls[7f40d5f18d3a19f0]::ScopedKey<rustc_span[e19c93a5cc4d231b]::SessionGlobals>>::set::<rustc_interface[259f7f2d687dc9cd]::interface::run_compiler<core[6c67f8de41fca20a]::result::Result<(), rustc_errors[473276f074908285]::ErrorGuaranteed>, rustc_driver[5234e93807a03500]::run_compiler::{closure#1}>::{closure#0}, core[6c67f8de41fca20a]::result::Result<(), rustc_errors[473276f074908285]::ErrorGuaranteed>>
  32:     0x7f7567fb276f - std[da27fefd8cd19b64]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[259f7f2d687dc9cd]::util::run_in_thread_pool_with_globals<rustc_interface[259f7f2d687dc9cd]::interface::run_compiler<core[6c67f8de41fca20a]::result::Result<(), rustc_errors[473276f074908285]::ErrorGuaranteed>, rustc_driver[5234e93807a03500]::run_compiler::{closure#1}>::{closure#0}, core[6c67f8de41fca20a]::result::Result<(), rustc_errors[473276f074908285]::ErrorGuaranteed>>::{closure#0}, core[6c67f8de41fca20a]::result::Result<(), rustc_errors[473276f074908285]::ErrorGuaranteed>>
  33:     0x7f7567fb28a9 - <<std[da27fefd8cd19b64]::thread::Builder>::spawn_unchecked_<rustc_interface[259f7f2d687dc9cd]::util::run_in_thread_pool_with_globals<rustc_interface[259f7f2d687dc9cd]::interface::run_compiler<core[6c67f8de41fca20a]::result::Result<(), rustc_errors[473276f074908285]::ErrorGuaranteed>, rustc_driver[5234e93807a03500]::run_compiler::{closure#1}>::{closure#0}, core[6c67f8de41fca20a]::result::Result<(), rustc_errors[473276f074908285]::ErrorGuaranteed>>::{closure#0}, core[6c67f8de41fca20a]::result::Result<(), rustc_errors[473276f074908285]::ErrorGuaranteed>>::{closure#1} as core[6c67f8de41fca20a]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  34:     0x7f75657752e3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hd85bf70b078c05e8
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/alloc/src/boxed.rs:1872:9
  35:     0x7f75657752e3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h6a20ba204ab10b14
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/alloc/src/boxed.rs:1872:9
  36:     0x7f75657752e3 - std::sys::unix::thread::Thread::new::thread_start::h6522ecd8b15d879a
                               at /rustc/ea92b08383b718e79317b29470cb244c48557cd5/library/std/src/sys/unix/thread.rs:108:17
  37:     0x7f75656a5609 - start_thread
  38:     0x7f75655be163 - clone
  39:                0x0 - <unknown>

error: internal compiler error: unexpected panic

note: 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 1.62.0-nightly (ea92b0838 2022-05-07) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type bin -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
warning: `playground` (bin "playground") generated 1 warning
error: could not compile `playground`; 1 warning emitted

@Badel2 Badel2 added C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels May 8, 2022
@rust-lang-glacier-bot rust-lang-glacier-bot added the glacier ICE tracked in rust-lang/glacier. label May 12, 2022
@dwrensha
Copy link
Contributor

dwrensha commented Aug 7, 2022

searched nightlies: from nightly-2021-01-07 to nightly-2022-07-24
regressed nightly: nightly-2022-05-05
searched commits: from e1b71fe to 4c60a0e
regressed commit: 4c60a0e

bisected with cargo-bisect-rustc v0.6.0

Host triple: x86_64-unknown-linux-gnu
Reproduce with:

cargo bisect-rustc --start=2021-1-7 --end=2022-07-24 --regress ice 

@dwrensha
Copy link
Contributor

dwrensha commented Aug 7, 2022

This regressed in #96546. cc @nnethercote

@nnethercote
Copy link
Contributor

Thanks for the report, @dwrensha!

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Aug 11, 2022
bors added a commit to rust-lang-ci/rust that referenced this issue Aug 11, 2022
…iaskrgr

Rollup of 13 pull requests

Successful merges:

 - rust-lang#93896 (rustdoc: make item-infos dimmer on dark theme)
 - rust-lang#99337 (rustdoc: simplify highlight.rs)
 - rust-lang#99421 (add crt-static for android)
 - rust-lang#99500 (Fix flags when using clang as linker for Fuchsia)
 - rust-lang#99511 (make raw_eq precondition more restrictive)
 - rust-lang#99992 (Add `x.sh` and `x.ps1` shell scripts)
 - rust-lang#100112 (Fix test: chunks_mut_are_send_and_sync)
 - rust-lang#100203 (provide correct size hint for unsupported platform `CommandArgs`)
 - rust-lang#100307 (Fix rust-lang#96847)
 - rust-lang#100350 (Stringify non-shorthand visibility correctly)
 - rust-lang#100374 (Improve crate selection on rustdoc search results page)
 - rust-lang#100392 (Simplify visitors)
 - rust-lang#100418 (Add stability attributes to BacktraceStatus variants)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors closed this as completed in ce78042 Aug 12, 2022
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Labels
C-bug Category: This is a bug. glacier ICE tracked in rust-lang/glacier. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
Projects
None yet
Development

Successfully merging a pull request may close this issue.

4 participants