ICE: inconsistent resolution for an import

[matthiaskrgr]

auto-reduced (treereduce-rust):

use io::{self as std};
use std::collections::{self as io};

original:

use std::collections::{self as io};
use io::{self as std};

Version information

rustc 1.80.0-nightly (91d5e4af8 2024-04-28)
binary: rustc
commit-hash: 91d5e4af8674bde06096bac1e7ac04af0e94c691
commit-date: 2024-04-28
host: x86_64-unknown-linux-gnu
release: 1.80.0-nightly
LLVM version: 18.1.4

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zunstable-options --edition=2024

Program output

error: internal compiler error: compiler/rustc_resolve/src/imports.rs:884:25: inconsistent resolution for an import
 --> /tmp/icemaker_global_tempdir.7N3g3X1DaYFn/rustc_testrunner_tmpdir_reporting.hyRGLJm0FCJ6/mvce.rs:2:24
  |
2 | use std::collections::{self as io};
  |                        ^^^^^^^^^^

thread 'rustc' panicked at compiler/rustc_resolve/src/imports.rs:884:25:
Box<dyn Any>
stack backtrace:
   0:     0x7b6b0a636035 - std::backtrace_rs::backtrace::libunwind::trace::ha90ea7a57c64b8ab
                               at /rustc/91d5e4af8674bde06096bac1e7ac04af0e94c691/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x7b6b0a636035 - std::backtrace_rs::backtrace::trace_unsynchronized::ha58e55f622939b6e
                               at /rustc/91d5e4af8674bde06096bac1e7ac04af0e94c691/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7b6b0a636035 - std::sys_common::backtrace::_print_fmt::h687007ed504e7e64
                               at /rustc/91d5e4af8674bde06096bac1e7ac04af0e94c691/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7b6b0a636035 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hecfae54cdc6fec81
                               at /rustc/91d5e4af8674bde06096bac1e7ac04af0e94c691/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7b6b0a68529b - core::fmt::rt::Argument::fmt::h1cf6305de42401ed
                               at /rustc/91d5e4af8674bde06096bac1e7ac04af0e94c691/library/core/src/fmt/rt.rs:165:63
   5:     0x7b6b0a68529b - core::fmt::write::hb74fc275648248fb
                               at /rustc/91d5e4af8674bde06096bac1e7ac04af0e94c691/library/core/src/fmt/mod.rs:1157:21
   6:     0x7b6b0a62abdf - std::io::Write::write_fmt::h5209ffd8e6502f0c
                               at /rustc/91d5e4af8674bde06096bac1e7ac04af0e94c691/library/std/src/io/mod.rs:1832:15
   7:     0x7b6b0a635e0e - std::sys_common::backtrace::_print::h168707047d27c84e
                               at /rustc/91d5e4af8674bde06096bac1e7ac04af0e94c691/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7b6b0a635e0e - std::sys_common::backtrace::print::h2942d174d6b0e46d
                               at /rustc/91d5e4af8674bde06096bac1e7ac04af0e94c691/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7b6b0a638779 - std::panicking::default_hook::{{closure}}::h4215c46ca923b014
  10:     0x7b6b0a6384bd - std::panicking::default_hook::h887f937d01fa1b64
                               at /rustc/91d5e4af8674bde06096bac1e7ac04af0e94c691/library/std/src/panicking.rs:298:9
  11:     0x7b6b06e40a1c - std[aaff33ccdb7ea7e2]::panicking::update_hook::<alloc[d1c3a5de2ae3927d]::boxed::Box<rustc_driver_impl[d0a4257edbfecd8c]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7b6b0a638e76 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hfe27c2dc23f9f057
                               at /rustc/91d5e4af8674bde06096bac1e7ac04af0e94c691/library/alloc/src/boxed.rs:2036:9
  13:     0x7b6b0a638e76 - std::panicking::rust_panic_with_hook::h6ef218c13552449b
                               at /rustc/91d5e4af8674bde06096bac1e7ac04af0e94c691/library/std/src/panicking.rs:799:13
  14:     0x7b6b06e70374 - std[aaff33ccdb7ea7e2]::panicking::begin_panic::<rustc_errors[6ff9940fea39db99]::ExplicitBug>::{closure#0}
  15:     0x7b6b06e6cff6 - std[aaff33ccdb7ea7e2]::sys_common::backtrace::__rust_end_short_backtrace::<std[aaff33ccdb7ea7e2]::panicking::begin_panic<rustc_errors[6ff9940fea39db99]::ExplicitBug>::{closure#0}, !>
  16:     0x7b6b06e6ccd6 - std[aaff33ccdb7ea7e2]::panicking::begin_panic::<rustc_errors[6ff9940fea39db99]::ExplicitBug>
  17:     0x7b6b06e79181 - <rustc_errors[6ff9940fea39db99]::diagnostic::BugAbort as rustc_errors[6ff9940fea39db99]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  18:     0x7b6b076ede48 - <rustc_errors[6ff9940fea39db99]::DiagCtxt>::span_bug::<rustc_span[6a84a2dd20c85103]::span_encoding::Span, alloc[d1c3a5de2ae3927d]::string::String>
  19:     0x7b6b0770a73d - rustc_middle[783a1d49f02736b7]::util::bug::opt_span_bug_fmt::<rustc_span[6a84a2dd20c85103]::span_encoding::Span>::{closure#0}
  20:     0x7b6b0770a76a - rustc_middle[783a1d49f02736b7]::ty::context::tls::with_opt::<rustc_middle[783a1d49f02736b7]::util::bug::opt_span_bug_fmt<rustc_span[6a84a2dd20c85103]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7b6b07704c8b - rustc_middle[783a1d49f02736b7]::ty::context::tls::with_context_opt::<rustc_middle[783a1d49f02736b7]::ty::context::tls::with_opt<rustc_middle[783a1d49f02736b7]::util::bug::opt_span_bug_fmt<rustc_span[6a84a2dd20c85103]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7b6b05906ec7 - rustc_middle[783a1d49f02736b7]::util::bug::span_bug_fmt::<rustc_span[6a84a2dd20c85103]::span_encoding::Span>
  23:     0x7b6b0923d880 - <rustc_resolve[956dd1017de6f360]::Resolver>::resolve_crate::{closure#0}
  24:     0x7b6b09234c9c - <rustc_resolve[956dd1017de6f360]::Resolver>::resolve_crate
  25:     0x7b6b0881032b - rustc_interface[3360209938edb6a7]::passes::resolver_for_lowering_raw
  26:     0x7b6b0880f567 - rustc_query_impl[77a161a94332e7e1]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[77a161a94332e7e1]::query_impl::resolver_for_lowering_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[783a1d49f02736b7]::query::erase::Erased<[u8; 16usize]>>
  27:     0x7b6b0880f555 - <rustc_query_impl[77a161a94332e7e1]::query_impl::resolver_for_lowering_raw::dynamic_query::{closure#2} as core[8db7010e98043ac]::ops::function::FnOnce<(rustc_middle[783a1d49f02736b7]::ty::context::TyCtxt, ())>>::call_once
  28:     0x7b6b09002e85 - rustc_query_system[61cd216fcfa07925]::query::plumbing::try_execute_query::<rustc_query_impl[77a161a94332e7e1]::DynamicConfig<rustc_query_system[61cd216fcfa07925]::query::caches::SingleCache<rustc_middle[783a1d49f02736b7]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[77a161a94332e7e1]::plumbing::QueryCtxt, false>
  29:     0x7b6b09002a01 - rustc_query_impl[77a161a94332e7e1]::query_impl::resolver_for_lowering_raw::get_query_non_incr::__rust_end_short_backtrace
  30:     0x7b6b08ea30be - rustc_interface[3360209938edb6a7]::interface::run_compiler::<core[8db7010e98043ac]::result::Result<(), rustc_span[6a84a2dd20c85103]::ErrorGuaranteed>, rustc_driver_impl[d0a4257edbfecd8c]::run_compiler::{closure#0}>::{closure#1}
  31:     0x7b6b08e727c9 - std[aaff33ccdb7ea7e2]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[3360209938edb6a7]::util::run_in_thread_with_globals<rustc_interface[3360209938edb6a7]::util::run_in_thread_pool_with_globals<rustc_interface[3360209938edb6a7]::interface::run_compiler<core[8db7010e98043ac]::result::Result<(), rustc_span[6a84a2dd20c85103]::ErrorGuaranteed>, rustc_driver_impl[d0a4257edbfecd8c]::run_compiler::{closure#0}>::{closure#1}, core[8db7010e98043ac]::result::Result<(), rustc_span[6a84a2dd20c85103]::ErrorGuaranteed>>::{closure#0}, core[8db7010e98043ac]::result::Result<(), rustc_span[6a84a2dd20c85103]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[8db7010e98043ac]::result::Result<(), rustc_span[6a84a2dd20c85103]::ErrorGuaranteed>>
  32:     0x7b6b08e72576 - <<std[aaff33ccdb7ea7e2]::thread::Builder>::spawn_unchecked_<rustc_interface[3360209938edb6a7]::util::run_in_thread_with_globals<rustc_interface[3360209938edb6a7]::util::run_in_thread_pool_with_globals<rustc_interface[3360209938edb6a7]::interface::run_compiler<core[8db7010e98043ac]::result::Result<(), rustc_span[6a84a2dd20c85103]::ErrorGuaranteed>, rustc_driver_impl[d0a4257edbfecd8c]::run_compiler::{closure#0}>::{closure#1}, core[8db7010e98043ac]::result::Result<(), rustc_span[6a84a2dd20c85103]::ErrorGuaranteed>>::{closure#0}, core[8db7010e98043ac]::result::Result<(), rustc_span[6a84a2dd20c85103]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[8db7010e98043ac]::result::Result<(), rustc_span[6a84a2dd20c85103]::ErrorGuaranteed>>::{closure#2} as core[8db7010e98043ac]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  33:     0x7b6b0a642cab - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h1c1c6804813d5e77
                               at /rustc/91d5e4af8674bde06096bac1e7ac04af0e94c691/library/alloc/src/boxed.rs:2022:9
  34:     0x7b6b0a642cab - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h3d84aa3b40a67b8f
                               at /rustc/91d5e4af8674bde06096bac1e7ac04af0e94c691/library/alloc/src/boxed.rs:2022:9
  35:     0x7b6b0a642cab - std::sys::pal::unix::thread::Thread::new::thread_start::h60cefba2ee6cce64
                               at /rustc/91d5e4af8674bde06096bac1e7ac04af0e94c691/library/std/src/sys/pal/unix/thread.rs:108:17
  36:     0x7b6b0a3e155a - <unknown>
  37:     0x7b6b0a45ea3c - <unknown>
  38:                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 make sure that you have updated to the latest nightly

note: rustc 1.80.0-nightly (91d5e4af8 2024-04-28) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z unstable-options -Z dump-mir-dir=dir

query stack during panic:
#0 [resolver_for_lowering_raw] getting the resolver for lowering
end of query stack
error: aborting due to 1 previous error

[matthiaskrgr]

also crashes with just --edition=2021

[matthiaskrgr]

Regression in nightly-2023-07-01

commit[0] 2023-06-29: Auto merge of #112682 - spastorino:new-rpitit-21, r=compiler-errors
commit[1] 2023-06-30: Auto merge of #113116 - nnethercote:codegen-opts, r=oli-obk
commit[2] 2023-06-30: Auto merge of #113162 - matthiaskrgr:rollup-fct3wj7, r=matthiaskrgr
commit[3] 2023-06-30: Auto merge of #113188 - matthiaskrgr:rollup-j3abaks, r=matthiaskrgr
commit[4] 2023-06-30: Auto merge of #106619 - agausmann:avr-object-file, r=nagisa
commit[5] 2023-06-30: Auto merge of #109524 - bzEq:aix-embed-llvmbc, r=nagisa
commit[6] 2023-06-30: Auto merge of #113200 - ferrocene:pa-fix-mir-opt-bless, r=oli-obk

I suspect this is #112086

[Nilstrieb]

use std::collections as x;
use x as std;

slightly more minimal (ordering is irrelevant)

[bvanjoi]

more reduced:

mod a {
    pub mod b {
        pub mod c {}
    } 
}

use a::*;

use b::c;
use c as b;

fn main() {}