ICE: failed to resolve instance for .. -Zprint-mono-items=eager

[matthiaskrgr]

Code

rustc file.rs -Zprint-mono-items=eager

#![crate_type = "lib"]

trait Visit {
    fn visit() {}
}

trait Array<'a> {
    type Element: 'a;
}

impl Visit for () where
    (): for<'a> Array<'a, Element=()>,
{}

Meta

rustc --version --verbose:

rustc 1.70.0-nightly (7b4f48927 2023-03-12)
binary: rustc
commit-hash: 7b4f48927dce585f747a58083b45ab62b9d73a53
commit-date: 2023-03-12
host: x86_64-unknown-linux-gnu
release: 1.70.0-nightly
LLVM version: 15.0.7

Error output

<output>

Backtrace

error: internal compiler error: compiler/rustc_middle/src/ty/instance.rs:397:18: failed to resolve instance for <() as Visit>::visit

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/compiler/rustc_errors/src/lib.rs:1644:9
stack backtrace:
   0:     0x7ff93cd6651a - std::backtrace_rs::backtrace::libunwind::trace::hf7d75cca16fd1b61
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7ff93cd6651a - std::backtrace_rs::backtrace::trace_unsynchronized::hf5ec95734aab509d
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7ff93cd6651a - std::sys_common::backtrace::_print_fmt::he95113413355c8cd
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7ff93cd6651a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h072d12f2e69ca92b
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7ff93cdc9c5e - core::fmt::write::h1d23f16415e96af2
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/core/src/fmt/mod.rs:1232:17
   5:     0x7ff93cd59275 - std::io::Write::write_fmt::hcf1e413fde4ffcd5
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/io/mod.rs:1684:15
   6:     0x7ff93cd662e5 - std::sys_common::backtrace::_print::h6b2b14bedd5177e7
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7ff93cd662e5 - std::sys_common::backtrace::print::h09ccebfbcd382e89
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7ff93cd6905f - std::panicking::default_hook::{{closure}}::h4ee055db778febc2
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/panicking.rs:271:22
   9:     0x7ff93cd68d9b - std::panicking::default_hook::ha74f60e3a15d95fb
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/panicking.rs:290:9
  10:     0x7ff940097085 - rustc_driver_impl[d355a67661263e47]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7ff93cd6989d - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h7f34603beb945e8f
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/alloc/src/boxed.rs:2002:9
  12:     0x7ff93cd6989d - std::panicking::rust_panic_with_hook::h4b5d379936d4932f
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/panicking.rs:696:13
  13:     0x7ff940602371 - std[e52d7c968ed01318]::panicking::begin_panic::<rustc_errors[45159b7f7e36021d]::ExplicitBug>::{closure#0}
  14:     0x7ff9405fdaa6 - std[e52d7c968ed01318]::sys_common::backtrace::__rust_end_short_backtrace::<std[e52d7c968ed01318]::panicking::begin_panic<rustc_errors[45159b7f7e36021d]::ExplicitBug>::{closure#0}, !>
  15:     0x7ff940686046 - std[e52d7c968ed01318]::panicking::begin_panic::<rustc_errors[45159b7f7e36021d]::ExplicitBug>
  16:     0x7ff940651e06 - std[e52d7c968ed01318]::panic::panic_any::<rustc_errors[45159b7f7e36021d]::ExplicitBug>
  17:     0x7ff94064d966 - <rustc_errors[45159b7f7e36021d]::HandlerInner>::bug::<&alloc[fc860cae0dfa1ab1]::string::String>
  18:     0x7ff94064d630 - <rustc_errors[45159b7f7e36021d]::Handler>::bug::<&alloc[fc860cae0dfa1ab1]::string::String>
  19:     0x7ff940639a9b - rustc_middle[a96ac5d591578447]::util::bug::opt_span_bug_fmt::<rustc_span[f8bdfaef83e46314]::span_encoding::Span>::{closure#0}
  20:     0x7ff9406384fa - rustc_middle[a96ac5d591578447]::ty::context::tls::with_opt::<rustc_middle[a96ac5d591578447]::util::bug::opt_span_bug_fmt<rustc_span[f8bdfaef83e46314]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7ff9406384c6 - rustc_middle[a96ac5d591578447]::ty::context::tls::with_context_opt::<rustc_middle[a96ac5d591578447]::ty::context::tls::with_opt<rustc_middle[a96ac5d591578447]::util::bug::opt_span_bug_fmt<rustc_span[f8bdfaef83e46314]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7ff9406399e6 - rustc_middle[a96ac5d591578447]::util::bug::opt_span_bug_fmt::<rustc_span[f8bdfaef83e46314]::span_encoding::Span>
  23:     0x7ff93e6b44b3 - rustc_middle[a96ac5d591578447]::util::bug::bug_fmt
  24:     0x7ff93fa29e8d - <rustc_middle[a96ac5d591578447]::ty::instance::Instance>::expect_resolve
  25:     0x7ff93f5b918a - rustc_monomorphize[237522c315bd14cc]::collector::collect_roots
  26:     0x7ff93f5b3f1e - <rustc_session[7e23441c2db8ce4a]::session::Session>::time::<alloc[fc860cae0dfa1ab1]::vec::Vec<rustc_middle[a96ac5d591578447]::mir::mono::MonoItem>, rustc_monomorphize[237522c315bd14cc]::collector::collect_crate_mono_items::{closure#0}>
  27:     0x7ff93f5b3cd1 - rustc_monomorphize[237522c315bd14cc]::collector::collect_crate_mono_items
  28:     0x7ff93f5b2160 - rustc_monomorphize[237522c315bd14cc]::partitioning::collect_and_partition_mono_items
  29:     0x7ff93e8a1372 - rustc_query_system[704b80a7bc44cd49]::query::plumbing::try_execute_query::<rustc_query_impl[217bee59c5548bf5]::queries::collect_and_partition_mono_items, rustc_query_impl[217bee59c5548bf5]::plumbing::QueryCtxt>
  30:     0x7ff93e8a102d - <rustc_query_impl[217bee59c5548bf5]::Queries as rustc_middle[a96ac5d591578447]::ty::query::QueryEngine>::collect_and_partition_mono_items
  31:     0x7ff93f852bd7 - rustc_codegen_ssa[d7553c89eed4006]::back::symbol_export::exported_symbols_provider_local
  32:     0x7ff93f7e35ba - rustc_query_system[704b80a7bc44cd49]::query::plumbing::try_execute_query::<rustc_query_impl[217bee59c5548bf5]::queries::exported_symbols, rustc_query_impl[217bee59c5548bf5]::plumbing::QueryCtxt>
  33:     0x7ff93f7e3211 - <rustc_query_impl[217bee59c5548bf5]::Queries as rustc_middle[a96ac5d591578447]::ty::query::QueryEngine>::exported_symbols
  34:     0x7ff93f34b042 - <rustc_metadata[836a88d53bc31123]::rmeta::encoder::EncodeContext>::encode_crate_root
  35:     0x7ff93f2dc516 - rustc_metadata[836a88d53bc31123]::rmeta::encoder::encode_metadata_impl
  36:     0x7ff93f2d68dc - rustc_data_structures[cc19bc993ab9b64]::sync::join::<rustc_metadata[836a88d53bc31123]::rmeta::encoder::encode_metadata::{closure#0}, rustc_metadata[836a88d53bc31123]::rmeta::encoder::encode_metadata::{closure#1}, (), ()>
  37:     0x7ff93f2d65e1 - rustc_metadata[836a88d53bc31123]::rmeta::encoder::encode_metadata
  38:     0x7ff93f2d57ea - rustc_metadata[836a88d53bc31123]::fs::encode_and_write_metadata
  39:     0x7ff93f2cee2e - rustc_interface[6bf42eb308c32713]::passes::start_codegen
  40:     0x7ff93f2cb948 - <rustc_middle[a96ac5d591578447]::ty::context::GlobalCtxt>::enter::<<rustc_interface[6bf42eb308c32713]::queries::Queries>::ongoing_codegen::{closure#0}::{closure#0}, core[125d846441ac421f]::result::Result<alloc[fc860cae0dfa1ab1]::boxed::Box<dyn core[125d846441ac421f]::any::Any>, rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>>
  41:     0x7ff93f2c9774 - <rustc_interface[6bf42eb308c32713]::queries::Queries>::ongoing_codegen
  42:     0x7ff93f2c84cc - rustc_span[f8bdfaef83e46314]::with_source_map::<core[125d846441ac421f]::result::Result<(), rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>, rustc_interface[6bf42eb308c32713]::interface::run_compiler<core[125d846441ac421f]::result::Result<(), rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>, rustc_driver_impl[d355a67661263e47]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  43:     0x7ff93f2bf70c - std[e52d7c968ed01318]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[6bf42eb308c32713]::util::run_in_thread_pool_with_globals<rustc_interface[6bf42eb308c32713]::interface::run_compiler<core[125d846441ac421f]::result::Result<(), rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>, rustc_driver_impl[d355a67661263e47]::run_compiler::{closure#1}>::{closure#0}, core[125d846441ac421f]::result::Result<(), rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[125d846441ac421f]::result::Result<(), rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>>
  44:     0x7ff93f2bf13a - <<std[e52d7c968ed01318]::thread::Builder>::spawn_unchecked_<rustc_interface[6bf42eb308c32713]::util::run_in_thread_pool_with_globals<rustc_interface[6bf42eb308c32713]::interface::run_compiler<core[125d846441ac421f]::result::Result<(), rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>, rustc_driver_impl[d355a67661263e47]::run_compiler::{closure#1}>::{closure#0}, core[125d846441ac421f]::result::Result<(), rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[125d846441ac421f]::result::Result<(), rustc_span[f8bdfaef83e46314]::ErrorGuaranteed>>::{closure#1} as core[125d846441ac421f]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  45:     0x7ff93cd73793 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hc0a50816e1eb2bba
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/alloc/src/boxed.rs:1988:9
  46:     0x7ff93cd73793 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hb2f83fc2049033c3
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/alloc/src/boxed.rs:1988:9
  47:     0x7ff93cd73793 - std::sys::unix::thread::Thread::new::thread_start::hce5861512f8bf7ea
                               at /rustc/7b4f48927dce585f747a58083b45ab62b9d73a53/library/std/src/sys/unix/thread.rs:108:17
  48:     0x7ff93caf4bb5 - <unknown>
  49:     0x7ff93cb76d90 - <unknown>
  50:                0x0 - <unknown>

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 1.70.0-nightly (7b4f48927 2023-03-12) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z print-mono-items=eager

query stack during panic:
#0 [collect_and_partition_mono_items] collect_and_partition_mono_items
#1 [exported_symbols] collecting exported symbols for crate `0`
end of query stack
error: aborting due to previous error

[matthiaskrgr]

reduced

#![crate_type = "lib"]

trait Visit {
    fn visit() {}
}

trait Array<'a> {}

impl Visit for () where
    (): for<'a> Array<'a, >,
{}

[compiler-errors]

This actually repro's with -Clink-dead-code=on as well.