ICE on nightly compiling [email protected]

[mathstuf]

Code

Not minimized, but reproducer:

$ podman run --rm -it rustlang/rust@sha256:fc8fd56bd7436cc979003b8afbe6843054fb583061221254d8fb4f69fce0df52
# cd
# mkdir c
# cd c
# cargo init
# cargo add [email protected]
# cargo build
<ICE>

Meta

Via the nightly Docker image:

Using docker image sha256:36b45aa1f13b45d1cf090538b2b84c820d6d2153d1f6a2636fbee4297253dcea for rustlang/rust:nightly with digest rustlang/rust@sha256:fc8fd56bd7436cc979003b8afbe6843054fb583061221254d8fb4f69fce0df52 ...

rustc --version --verbose:

rustc 1.73.0-nightly (28eb857b9 2023-08-12)
binary: rustc
commit-hash: 28eb857b9504bd05bbed0cf8af8e825fbdbb1fa1
commit-date: 2023-08-12
host: x86_64-unknown-linux-gnu
release: 1.73.0-nightly
LLVM version: 17.0.0

Did not happen with the previous night's job:

rustc 1.73.0-nightly (a6f8aa5a0 2023-08-11)
binary: rustc
commit-hash: a6f8aa5a092c5e46fcbdafe4c80b4e55ba0de41c
commit-date: 2023-08-11
host: x86_64-unknown-linux-gnu
release: 1.73.0-nightly
LLVM version: 17.0.0

Error output

error: internal compiler error: no errors encountered even though `delay_span_bug` issued

error: internal compiler error: unresolved inference variable in outlives: ?29t
   --> /builds/rust/vendor/combine/src/parser/choice.rs:279:13
    |
279 | /             fn add_error_choice(
280 | |                 &mut self,
281 | |                 error: &mut Tracked<<Self::Input as StreamOnce>::Error>
282 | |             ) {
    | |_____________^
...
298 |   tuple_choice_parser!(A B C D E F G H I J K L M N O P Q R S T U V X Y Z);
    |   ----------------------------------------------------------------------- in this macro invocation
    |
note: delayed at compiler/rustc_infer/src/infer/outlives/obligations.rs:254:35
   --> /builds/rust/vendor/combine/src/parser/choice.rs:279:13
    |
279 | /             fn add_error_choice(
280 | |                 &mut self,
281 | |                 error: &mut Tracked<<Self::Input as StreamOnce>::Error>
282 | |             ) {
    | |_____________^
...
298 |   tuple_choice_parser!(A B C D E F G H I J K L M N O P Q R S T U V X Y Z);
    |   ----------------------------------------------------------------------- in this macro invocation
    = note: this error: internal compiler error originates in the macro `tuple_choice_parser_inner` which comes from the expansion of the macro `tuple_choice_parser` (in Nightly builds, run with -Z macro-backtrace for more info)

Backtrace

         0: <rustc_errors::HandlerInner>::emit_diagnostic
         1: <rustc_session::session::Session>::delay_span_bug::<rustc_span::span_encoding::Span, alloc::string::String>
         2: <rustc_infer::infer::outlives::obligations::TypeOutlives<&rustc_infer::infer::InferCtxt>>::components_must_outlive
         3: <rustc_infer::infer::InferCtxt>::resolve_regions
         4: rustc_hir_analysis::check::compare_impl_item::compare_method_predicate_entailment
         5: rustc_hir_analysis::check::check::check_mod_item_types
         6: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::check_mod_item_types::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>>
         7: <rustc_query_impl::query_impl::check_mod_item_types::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
         8: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
         9: rustc_query_impl::query_impl::check_mod_item_types::get_query_non_incr::__rust_end_short_backtrace
        10: <rustc_middle::hir::map::Map>::for_each_module::<rustc_hir_analysis::check_crate::{closure#6}::{closure#0}>
        11: rustc_hir_analysis::check_crate
        12: rustc_interface::passes::analysis
        13: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
        14: <rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, ())>>::call_once
        15: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        16: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
        17: <rustc_middle::ty::context::GlobalCtxt>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#6}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
        18: rustc_span::set_source_map::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
        19: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
        20: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
        21: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/28eb857b9504bd05bbed0cf8af8e825fbdbb1fa1/library/alloc/src/boxed.rs:2007:9
        22: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                   at /rustc/28eb857b9504bd05bbed0cf8af8e825fbdbb1fa1/library/alloc/src/boxed.rs:2007:9
        23: std::sys::unix::thread::Thread::new::thread_start
                   at /rustc/28eb857b9504bd05bbed0cf8af8e825fbdbb1fa1/library/std/src/sys/unix/thread.rs:108:17
        24: start_thread
        25: clone

[fmease]

Duplicate of #114783. Fixed on next nightly.

[mathstuf]

Thanks! I missed it because I think I forgot to clear off the is:closed default filter.