ICE: `import.imported_module.get().is_none()`

[matthiaskrgr]

auto-reduced (treereduce-rust):

mod a {
    pub mod b {
        pub mod c {
            pub trait D {}
        }
    }
}

use a::*;

use e as b;

use b::c::D as e;

fn e() {}

original:

// https://github.com/rust-lang/rust/issues/125013

mod a {
  pub mod b {
    pub mod c {
      pub trait D {}
    }
  }
}

use a::*;

use e as b;
//~^ ERROR: unresolved import `e`
use b::c::D as e;
//~^ ERROR: cannot determine resolution for the import
//~| ERROR: cannot determine resolution for the import

fn e() { }

Version information

rustc 1.81.0-nightly (c25ac9d6c 2024-06-12)
binary: rustc
commit-hash: c25ac9d6cc285e57e1176dc2da6848b9d0163810
commit-date: 2024-06-12
host: x86_64-unknown-linux-gnu
release: 1.81.0-nightly
LLVM version: 18.1.7

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc

Program output

thread 'rustc' panicked at compiler/rustc_resolve/src/imports.rs:938:21:
assertion failed: import.imported_module.get().is_none()
stack backtrace:
   0:     0x7be9c715fae5 - std::backtrace_rs::backtrace::libunwind::trace::h6be50cef0e090531
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
   1:     0x7be9c715fae5 - std::backtrace_rs::backtrace::trace_unsynchronized::h84167074cb4f1713
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7be9c715fae5 - std::sys_common::backtrace::_print_fmt::hb5cf039fd1f30b07
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7be9c715fae5 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h01adaba1565f117f
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7be9c71b077b - core::fmt::rt::Argument::fmt::h2910e36f4e21d32d
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/core/src/fmt/rt.rs:165:63
   5:     0x7be9c71b077b - core::fmt::write::h6d9d2f7ff8571b34
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/core/src/fmt/mod.rs:1168:21
   6:     0x7be9c71546bf - std::io::Write::write_fmt::hd882c0f914f56bf0
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/std/src/io/mod.rs:1835:15
   7:     0x7be9c715f8be - std::sys_common::backtrace::_print::hcc6c907dafd9aacb
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7be9c715f8be - std::sys_common::backtrace::print::h2c716a051c9b24be
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7be9c71622f9 - std::panicking::default_hook::{{closure}}::he8ad829f77bd4e23
  10:     0x7be9c716209c - std::panicking::default_hook::heb22a1402d2cff23
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/std/src/panicking.rs:292:9
  11:     0x7be9c38b2c9f - std[5c07af62f3786d14]::panicking::update_hook::<alloc[eebcfc85002bd7db]::boxed::Box<rustc_driver_impl[2b4723ede88f52b1]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7be9c7162bff - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hd8f0fcaec26c179e
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/alloc/src/boxed.rs:2076:9
  13:     0x7be9c7162bff - std::panicking::rust_panic_with_hook::hc9dbad8884217847
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/std/src/panicking.rs:801:13
  14:     0x7be9c71627f3 - std::panicking::begin_panic_handler::{{closure}}::hfdfb6c5ae8fe81a3
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/std/src/panicking.rs:660:13
  15:     0x7be9c715ffa9 - std::sys_common::backtrace::__rust_end_short_backtrace::h3b8888258ec03db5
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7be9c71624d4 - rust_begin_unwind
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/std/src/panicking.rs:658:5
  17:     0x7be9c71acd33 - core::panicking::panic_fmt::hefa4f153e9514c42
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/core/src/panicking.rs:74:14
  18:     0x7be9c71acdbc - core::panicking::panic::hb461493118d69f37
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/core/src/panicking.rs:148:5
  19:     0x7be9c5d213c7 - <rustc_resolve[b14fb066e2167f99]::Resolver>::resolve_crate::{closure#0}
  20:     0x7be9c5d12cc0 - <rustc_resolve[b14fb066e2167f99]::Resolver>::resolve_crate
  21:     0x7be9c50f555a - rustc_interface[8465b2f8b714accd]::passes::resolver_for_lowering_raw
  22:     0x7be9c50f47cd - rustc_query_impl[860f4585269295fe]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[860f4585269295fe]::query_impl::resolver_for_lowering_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[f645b954b6a941ee]::query::erase::Erased<[u8; 16usize]>>
  23:     0x7be9c50f47b1 - <rustc_query_impl[860f4585269295fe]::query_impl::resolver_for_lowering_raw::dynamic_query::{closure#2} as core[207868f0da9fe1eb]::ops::function::FnOnce<(rustc_middle[f645b954b6a941ee]::ty::context::TyCtxt, ())>>::call_once
  24:     0x7be9c59f4e1d - rustc_query_system[88bb5c8529314a04]::query::plumbing::try_execute_query::<rustc_query_impl[860f4585269295fe]::DynamicConfig<rustc_query_system[88bb5c8529314a04]::query::caches::SingleCache<rustc_middle[f645b954b6a941ee]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[860f4585269295fe]::plumbing::QueryCtxt, false>
  25:     0x7be9c59f4abd - rustc_query_impl[860f4585269295fe]::query_impl::resolver_for_lowering_raw::get_query_non_incr::__rust_end_short_backtrace
  26:     0x7be9c58d0782 - rustc_interface[8465b2f8b714accd]::interface::run_compiler::<core[207868f0da9fe1eb]::result::Result<(), rustc_span[9012e0e35e67507c]::ErrorGuaranteed>, rustc_driver_impl[2b4723ede88f52b1]::run_compiler::{closure#0}>::{closure#1}
  27:     0x7be9c58ef649 - std[5c07af62f3786d14]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[8465b2f8b714accd]::util::run_in_thread_with_globals<rustc_interface[8465b2f8b714accd]::util::run_in_thread_pool_with_globals<rustc_interface[8465b2f8b714accd]::interface::run_compiler<core[207868f0da9fe1eb]::result::Result<(), rustc_span[9012e0e35e67507c]::ErrorGuaranteed>, rustc_driver_impl[2b4723ede88f52b1]::run_compiler::{closure#0}>::{closure#1}, core[207868f0da9fe1eb]::result::Result<(), rustc_span[9012e0e35e67507c]::ErrorGuaranteed>>::{closure#0}, core[207868f0da9fe1eb]::result::Result<(), rustc_span[9012e0e35e67507c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[207868f0da9fe1eb]::result::Result<(), rustc_span[9012e0e35e67507c]::ErrorGuaranteed>>
  28:     0x7be9c58ef3fa - <<std[5c07af62f3786d14]::thread::Builder>::spawn_unchecked_<rustc_interface[8465b2f8b714accd]::util::run_in_thread_with_globals<rustc_interface[8465b2f8b714accd]::util::run_in_thread_pool_with_globals<rustc_interface[8465b2f8b714accd]::interface::run_compiler<core[207868f0da9fe1eb]::result::Result<(), rustc_span[9012e0e35e67507c]::ErrorGuaranteed>, rustc_driver_impl[2b4723ede88f52b1]::run_compiler::{closure#0}>::{closure#1}, core[207868f0da9fe1eb]::result::Result<(), rustc_span[9012e0e35e67507c]::ErrorGuaranteed>>::{closure#0}, core[207868f0da9fe1eb]::result::Result<(), rustc_span[9012e0e35e67507c]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[207868f0da9fe1eb]::result::Result<(), rustc_span[9012e0e35e67507c]::ErrorGuaranteed>>::{closure#2} as core[207868f0da9fe1eb]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  29:     0x7be9c716ca7b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hd64233370b4bbb13
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/alloc/src/boxed.rs:2062:9
  30:     0x7be9c716ca7b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8b9a0bf226b4eb10
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/alloc/src/boxed.rs:2062:9
  31:     0x7be9c716ca7b - std::sys::pal::unix::thread::Thread::new::thread_start::h25e4cee516ffa27e
                               at /rustc/c25ac9d6cc285e57e1176dc2da6848b9d0163810/library/std/src/sys/pal/unix/thread.rs:108:17
  32:     0x7be9c6f05ded - <unknown>
  33:     0x7be9c6f890dc - <unknown>
  34:                0x0 - <unknown>

error: 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: please make sure that you have updated to the latest nightly

note: rustc 1.81.0-nightly (c25ac9d6c 2024-06-12) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [resolver_for_lowering_raw] getting the resolver for lowering
end of query stack

[lqd]

cc @bvanjoi as this looks 99% like #125013 and you fixed that one recently ^^

[bvanjoi]

@rustbot claim. I will investigate it in my spare time.