ICE: `inconsistent resolution for an import`

[matthiaskrgr]

Code

need --edition=2021

use std;
use u8 as imported_u8;
pub use bar as u8;

Meta

rustc --version --verbose:

rustc 1.73.0-nightly (0308df23e 2023-07-21)
binary: rustc
commit-hash: 0308df23e621e783e31a27ca5beaa01b9df60d4a
commit-date: 2023-07-21
host: x86_64-unknown-linux-gnu
release: 1.73.0-nightly
LLVM version: 16.0.5

Error output

<output>

Backtrace

error: internal compiler error: compiler/rustc_resolve/src/imports.rs:994:33: inconsistent resolution for an import
 --> treereduce.out:2:5
  |
2 | use u8 as imported_u8;
  |     ^^^^^^^^^^^^^^^^^

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/0308df23e621e783e31a27ca5beaa01b9df60d4a/compiler/rustc_errors/src/lib.rs:1007:33
stack backtrace:
   0:     0x7f0aa4d62fc1 - std::backtrace_rs::backtrace::libunwind::trace::h8f154b6a796326e2
                               at /rustc/0308df23e621e783e31a27ca5beaa01b9df60d4a/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f0aa4d62fc1 - std::backtrace_rs::backtrace::trace_unsynchronized::hb8abeaf7dfb1c24b
                               at /rustc/0308df23e621e783e31a27ca5beaa01b9df60d4a/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f0aa4d62fc1 - std::sys_common::backtrace::_print_fmt::h3f47e60290db41a5
                               at /rustc/0308df23e621e783e31a27ca5beaa01b9df60d4a/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f0aa4d62fc1 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h4552f2dd442a589d
                               at /rustc/0308df23e621e783e31a27ca5beaa01b9df60d4a/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f0aa4dc949c - core::fmt::rt::Argument::fmt::h78a6be6446bd82bd
                               at /rustc/0308df23e621e783e31a27ca5beaa01b9df60d4a/library/core/src/fmt/rt.rs:138:9
   5:     0x7f0aa4dc949c - core::fmt::write::hd14ae211f7dd66b2
                               at /rustc/0308df23e621e783e31a27ca5beaa01b9df60d4a/library/core/src/fmt/mod.rs:1094:21
   6:     0x7f0aa4d557ae - std::io::Write::write_fmt::hdc8c0b5c45666412
                               at /rustc/0308df23e621e783e31a27ca5beaa01b9df60d4a/library/std/src/io/mod.rs:1714:15
   7:     0x7f0aa4d62dd5 - std::sys_common::backtrace::_print::h381fcf6b91d9d880
                               at /rustc/0308df23e621e783e31a27ca5beaa01b9df60d4a/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f0aa4d62dd5 - std::sys_common::backtrace::print::hcfe75c5be0f60777
                               at /rustc/0308df23e621e783e31a27ca5beaa01b9df60d4a/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f0aa4d65e2a - std::panicking::panic_hook_with_disk_dump::{{closure}}::hfe5fad22482c9f6d
                               at /rustc/0308df23e621e783e31a27ca5beaa01b9df60d4a/library/std/src/panicking.rs:278:22
  10:     0x7f0aa4d65ac3 - std::panicking::panic_hook_with_disk_dump::hc822f132c197763d
                               at /rustc/0308df23e621e783e31a27ca5beaa01b9df60d4a/library/std/src/panicking.rs:312:9
  11:     0x7f0aa7f928b9 - rustc_driver_impl[fead4037fc65a3e4]::install_ice_hook::{closure#0}
  12:     0x7f0aa4d666d0 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h549a9102e6ec42b3
                               at /rustc/0308df23e621e783e31a27ca5beaa01b9df60d4a/library/alloc/src/boxed.rs:2021:9
  13:     0x7f0aa4d666d0 - std::panicking::rust_panic_with_hook::h8adf1e4a5b603f89
                               at /rustc/0308df23e621e783e31a27ca5beaa01b9df60d4a/library/std/src/panicking.rs:733:13
  14:     0x7f0aa89d6041 - std[bbbc53192af03470]::panicking::begin_panic::<rustc_errors[5f83c55a23d0ef58]::ExplicitBug>::{closure#0}
  15:     0x7f0aa89d5f76 - std[bbbc53192af03470]::sys_common::backtrace::__rust_end_short_backtrace::<std[bbbc53192af03470]::panicking::begin_panic<rustc_errors[5f83c55a23d0ef58]::ExplicitBug>::{closure#0}, !>
  16:     0x7f0aa89dbd36 - std[bbbc53192af03470]::panicking::begin_panic::<rustc_errors[5f83c55a23d0ef58]::ExplicitBug>
  17:     0x7f0aa89cd1ce - <rustc_errors[5f83c55a23d0ef58]::HandlerInner>::span_bug::<rustc_span[a321f1cb1523dd0b]::span_encoding::Span, alloc[c920ce942076dd6e]::string::String>
  18:     0x7f0aa89cce3f - <rustc_errors[5f83c55a23d0ef58]::Handler>::span_bug::<rustc_span[a321f1cb1523dd0b]::span_encoding::Span, alloc[c920ce942076dd6e]::string::String>
  19:     0x7f0aa89cfb0d - rustc_middle[2e38e64f479fe5b8]::util::bug::opt_span_bug_fmt::<rustc_span[a321f1cb1523dd0b]::span_encoding::Span>::{closure#0}
  20:     0x7f0aa89cfb3a - rustc_middle[2e38e64f479fe5b8]::ty::context::tls::with_opt::<rustc_middle[2e38e64f479fe5b8]::util::bug::opt_span_bug_fmt<rustc_span[a321f1cb1523dd0b]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7f0aa89cf678 - rustc_middle[2e38e64f479fe5b8]::ty::context::tls::with_context_opt::<rustc_middle[2e38e64f479fe5b8]::ty::context::tls::with_opt<rustc_middle[2e38e64f479fe5b8]::util::bug::opt_span_bug_fmt<rustc_span[a321f1cb1523dd0b]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7f0aa89ceec4 - rustc_middle[2e38e64f479fe5b8]::util::bug::span_bug_fmt::<rustc_span[a321f1cb1523dd0b]::span_encoding::Span>
  23:     0x7f0aa703fc1d - <rustc_resolve[ae303a5d6effbad4]::Resolver>::finalize_import::{closure#1}
  24:     0x7f0aa703b3cb - <rustc_resolve[ae303a5d6effbad4]::Resolver>::finalize_import
  25:     0x7f0aa7039c32 - <rustc_resolve[ae303a5d6effbad4]::Resolver>::finalize_imports
  26:     0x7f0aa7015ac1 - <rustc_session[15d76b916424491d]::session::Session>::time::<(), <rustc_resolve[ae303a5d6effbad4]::Resolver>::resolve_crate::{closure#0}>
  27:     0x7f0aa700ef3a - rustc_interface[c9554cd0b74ea93d]::passes::resolver_for_lowering
  28:     0x7f0aa747c88a - rustc_query_impl[89227dfa721c8c03]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[89227dfa721c8c03]::query_impl::resolver_for_lowering::dynamic_query::{closure#2}::{closure#0}, rustc_middle[2e38e64f479fe5b8]::query::erase::Erased<[u8; 8usize]>>
  29:     0x7f0aa747c879 - <rustc_query_impl[89227dfa721c8c03]::query_impl::resolver_for_lowering::dynamic_query::{closure#2} as core[d7f3879bb305828b]::ops::function::FnOnce<(rustc_middle[2e38e64f479fe5b8]::ty::context::TyCtxt, ())>>::call_once
  30:     0x7f0aa73e70cc - rustc_query_system[c0a52eceb1a71305]::query::plumbing::try_execute_query::<rustc_query_impl[89227dfa721c8c03]::DynamicConfig<rustc_query_system[c0a52eceb1a71305]::query::caches::SingleCache<rustc_middle[2e38e64f479fe5b8]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[89227dfa721c8c03]::plumbing::QueryCtxt, false>
  31:     0x7f0aa78ee835 - rustc_query_impl[89227dfa721c8c03]::query_impl::resolver_for_lowering::get_query_non_incr::__rust_end_short_backtrace
  32:     0x7f0aa71d38a3 - <rustc_middle[2e38e64f479fe5b8]::ty::context::GlobalCtxt>::enter::<rustc_driver_impl[fead4037fc65a3e4]::run_compiler::{closure#1}::{closure#2}::{closure#2}, &rustc_data_structures[4d0670106038e5ac]::steal::Steal<(rustc_middle[2e38e64f479fe5b8]::ty::ResolverAstLowering, alloc[c920ce942076dd6e]::rc::Rc<rustc_ast[b395cbd05340d0a6]::ast::Crate>)>>
  33:     0x7f0aa71d2c9a - <rustc_interface[c9554cd0b74ea93d]::interface::Compiler>::enter::<rustc_driver_impl[fead4037fc65a3e4]::run_compiler::{closure#1}::{closure#2}, core[d7f3879bb305828b]::result::Result<core[d7f3879bb305828b]::option::Option<rustc_interface[c9554cd0b74ea93d]::queries::Linker>, rustc_span[a321f1cb1523dd0b]::ErrorGuaranteed>>
  34:     0x7f0aa71cff64 - std[bbbc53192af03470]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[c9554cd0b74ea93d]::util::run_in_thread_pool_with_globals<rustc_interface[c9554cd0b74ea93d]::interface::run_compiler<core[d7f3879bb305828b]::result::Result<(), rustc_span[a321f1cb1523dd0b]::ErrorGuaranteed>, rustc_driver_impl[fead4037fc65a3e4]::run_compiler::{closure#1}>::{closure#0}, core[d7f3879bb305828b]::result::Result<(), rustc_span[a321f1cb1523dd0b]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d7f3879bb305828b]::result::Result<(), rustc_span[a321f1cb1523dd0b]::ErrorGuaranteed>>
  35:     0x7f0aa71cf68e - <<std[bbbc53192af03470]::thread::Builder>::spawn_unchecked_<rustc_interface[c9554cd0b74ea93d]::util::run_in_thread_pool_with_globals<rustc_interface[c9554cd0b74ea93d]::interface::run_compiler<core[d7f3879bb305828b]::result::Result<(), rustc_span[a321f1cb1523dd0b]::ErrorGuaranteed>, rustc_driver_impl[fead4037fc65a3e4]::run_compiler::{closure#1}>::{closure#0}, core[d7f3879bb305828b]::result::Result<(), rustc_span[a321f1cb1523dd0b]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d7f3879bb305828b]::result::Result<(), rustc_span[a321f1cb1523dd0b]::ErrorGuaranteed>>::{closure#1} as core[d7f3879bb305828b]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  36:     0x7f0aa4d70dc5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h5a713c95dff49eb9
                               at /rustc/0308df23e621e783e31a27ca5beaa01b9df60d4a/library/alloc/src/boxed.rs:2007:9
  37:     0x7f0aa4d70dc5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h6c2630f276b49e94
                               at /rustc/0308df23e621e783e31a27ca5beaa01b9df60d4a/library/alloc/src/boxed.rs:2007:9
  38:     0x7f0aa4d70dc5 - std::sys::unix::thread::Thread::new::thread_start::he7c79aaf88d71e7c
                               at /rustc/0308df23e621e783e31a27ca5beaa01b9df60d4a/library/std/src/sys/unix/thread.rs:108:17
  39:     0x7f0aa4b0244b - <unknown>
  40:     0x7f0aa4b85e40 - <unknown>
  41:                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: please attach the file at `/tmp/im/rustc-ice-2023-07-22T09:14:40.068017531Z-3912339.txt` to your bug report

query stack during panic:
#0 [resolver_for_lowering] getting the resolver for lowering
end of query stack
error: aborting due to previous error

[matthiaskrgr]

Crashes on 1.72.0-beta.2 but not on 1.71.0

[matthiaskrgr]

Regression in nightly-2023-07-01
Regression in 97279e9
Regression in rust-lang-ci@ad537d4
#112086 cc @petrochenkov

[bvanjoi]

reduced:

// edition: 2021
use u8 as imported_u8;
use bar as u8;

fn main() {}

[apiraino]

WG-prioritization assigning priority (Zulip discussion).

@rustbot label -I-prioritize +P-medium