[ICE]: inconsistent resolution for an import

[matthiaskrgr]

auto-reduced (treereduce-rust):

//@compile-flags: --edition=2024
mod m1 {
    mod inner {
        pub struct S {}
    }
    pub use self::inner::*;

    #[derive(Debug)]
    pub struct S {}
}






use {
    pub struct S {}
};
use m1::*;

original:

mod m1 {
    mod inner {
        pub struct S {}
    }
    pub use self::inner::*;

    #[derive(Debug)]
    pub struct S {}
}

mod m2 {
    #[derive(Debug)]
    pub struct S {}
}

// First we have a glob ambiguity in this glob (with `m2::*`).
// Then we re-fetch `m1::*` because non-glob `m1::S` materializes from derive,
// and we need to make sure that the glob ambiguity is not lost during re-fetching.
use {
    pub struct S {}
};
use m1::*;

fn main() {
    let _: m1S = S {}; //~ ERROR `S` is ambiguous
                         // Then we re-fetch `m1::*` because non-glob `m1::S` materializes from derive,
}

Version information

rustc 1.96.0-nightly (212b0d480 2026-03-24)
binary: rustc
commit-hash: 212b0d480f337082bbe1132d2b62be20e7e61f8a
commit-date: 2026-03-24
host: x86_64-unknown-linux-gnu
release: 1.96.0-nightly
LLVM version: 22.1.0

Possibly related line of code:

rust/compiler/rustc_resolve/src/imports.rs

Lines 1234 to 1246 in 212b0d4

	this.dcx()
	.span_delayed_bug(import.span, "some error happened for an import");
	return;
	}
	if let Some(initial_res) = initial_res {
	if res != initial_res && !this.issue_145575_hack_applied {
	span_bug!(import.span, "inconsistent resolution for an import");
	}
	} else if this.privacy_errors.is_empty() {
	this.dcx()
	.create_err(CannotDetermineImportResolution { span: import.span })
	.emit();
	}

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

Program output

error: expected identifier, found keyword `pub`
  --> /tmp/icemaker_global_tempdir.OSuV6MRQ4VtL/rustc_testrunner_tmpdir_reporting.M8DISotgagEw/mvce.rs:17:5
   |
17 |     pub struct S {}
   |     ^^^ expected identifier, found keyword

error: expected identifier, found keyword `struct`
  --> /tmp/icemaker_global_tempdir.OSuV6MRQ4VtL/rustc_testrunner_tmpdir_reporting.M8DISotgagEw/mvce.rs:17:9
   |
17 |     pub struct S {}
   |         ^^^^^^ expected identifier, found keyword

error: expected one of `,`, `::`, `as`, or `}`, found keyword `struct`
  --> /tmp/icemaker_global_tempdir.OSuV6MRQ4VtL/rustc_testrunner_tmpdir_reporting.M8DISotgagEw/mvce.rs:17:9
   |
17 |     pub struct S {}
   |        -^^^^^^ expected one of `,`, `::`, `as`, or `}`
   |        |
   |        help: missing `,`

error: expected one of `,`, `::`, `as`, or `}`, found `S`
  --> /tmp/icemaker_global_tempdir.OSuV6MRQ4VtL/rustc_testrunner_tmpdir_reporting.M8DISotgagEw/mvce.rs:17:16
   |
17 |     pub struct S {}
   |               -^ expected one of `,`, `::`, `as`, or `}`
   |               |
   |               help: missing `,`

error: expected one of `,`, `::`, `as`, or `}`, found `{`
  --> /tmp/icemaker_global_tempdir.OSuV6MRQ4VtL/rustc_testrunner_tmpdir_reporting.M8DISotgagEw/mvce.rs:17:18
   |
17 |     pub struct S {}
   |                 -^ expected one of `,`, `::`, `as`, or `}`
   |                 |
   |                 help: missing `,`

error: internal compiler error: /rustc-dev/212b0d480f337082bbe1132d2b62be20e7e61f8a/compiler/rustc_resolve/src/imports.rs:1240:33: inconsistent resolution for an import
  --> /tmp/icemaker_global_tempdir.OSuV6MRQ4VtL/rustc_testrunner_tmpdir_reporting.M8DISotgagEw/mvce.rs:17:16
   |
17 |     pub struct S {}
   |                ^


thread 'rustc' (2847223) panicked at /rustc-dev/212b0d480f337082bbe1132d2b62be20e7e61f8a/compiler/rustc_resolve/src/imports.rs:1240:33:
Box<dyn Any>
stack backtrace:
   0:     0x7f44fc57f4fb - <<std[ea4077504e0ffae5]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[9903332b54e895af]::fmt::Display>::fmt
   1:     0x7f44fcc2f608 - core[9903332b54e895af]::fmt::write
   2:     0x7f44fc596506 - <std[ea4077504e0ffae5]::sys::stdio::unix::Stderr as std[ea4077504e0ffae5]::io::Write>::write_fmt
   3:     0x7f44fc555508 - std[ea4077504e0ffae5]::panicking::default_hook::{closure#0}
   4:     0x7f44fc572903 - std[ea4077504e0ffae5]::panicking::default_hook
   5:     0x7f44fb578bcc - std[ea4077504e0ffae5]::panicking::update_hook::<alloc[50c02619db1397b2]::boxed::Box<rustc_driver_impl[caf990db37bd39f4]::install_ice_hook::{closure#1}>>::{closure#0}
   6:     0x7f44fc572be2 - std[ea4077504e0ffae5]::panicking::panic_with_hook
   7:     0x7f44fb5a8231 - std[ea4077504e0ffae5]::panicking::begin_panic::<rustc_errors[db30cdc29f09d00]::ExplicitBug>::{closure#0}
   8:     0x7f44fb5a0f16 - std[ea4077504e0ffae5]::sys::backtrace::__rust_end_short_backtrace::<std[ea4077504e0ffae5]::panicking::begin_panic<rustc_errors[db30cdc29f09d00]::ExplicitBug>::{closure#0}, !>
   9:     0x7f44fb5a0c7b - std[ea4077504e0ffae5]::panicking::begin_panic::<rustc_errors[db30cdc29f09d00]::ExplicitBug>
  10:     0x7f44fb5b3871 - <rustc_errors[db30cdc29f09d00]::diagnostic::BugAbort as rustc_errors[db30cdc29f09d00]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  11:     0x7f44fbb6971c - <rustc_errors[db30cdc29f09d00]::DiagCtxtHandle>::span_bug::<rustc_span[a1dfc738e0f2d96f]::span_encoding::Span, alloc[50c02619db1397b2]::string::String>
  12:     0x7f44fbb91746 - rustc_middle[74264659555fab5]::util::bug::opt_span_bug_fmt::<rustc_span[a1dfc738e0f2d96f]::span_encoding::Span>::{closure#0}
  13:     0x7f44fbb918f2 - rustc_middle[74264659555fab5]::ty::context::tls::with_opt::<rustc_middle[74264659555fab5]::util::bug::opt_span_bug_fmt<rustc_span[a1dfc738e0f2d96f]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  14:     0x7f44fbb81ecb - rustc_middle[74264659555fab5]::ty::context::tls::with_context_opt::<rustc_middle[74264659555fab5]::ty::context::tls::with_opt<rustc_middle[74264659555fab5]::util::bug::opt_span_bug_fmt<rustc_span[a1dfc738e0f2d96f]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  15:     0x7f44f9da00e8 - rustc_middle[74264659555fab5]::util::bug::span_bug_fmt::<rustc_span[a1dfc738e0f2d96f]::span_encoding::Span>
  16:     0x7f44fd151bc9 - <rustc_resolve[4858795a5514e6eb]::Resolver>::finalize_import::{closure#2}
  17:     0x7f44fd149776 - <rustc_resolve[4858795a5514e6eb]::Resolver>::resolve_crate::{closure#0}
  18:     0x7f44fd144e07 - <rustc_resolve[4858795a5514e6eb]::Resolver>::resolve_crate
  19:     0x7f44fd12bb88 - rustc_interface[64e4eefc34cc1822]::passes::configure_and_expand
  20:     0x7f44fd8f7752 - rustc_interface[64e4eefc34cc1822]::passes::resolver_for_lowering_raw
  21:     0x7f44fd8f74cd - rustc_query_impl[8681e81019ae3337]::query_impl::resolver_for_lowering_raw::invoke_provider_fn::__rust_begin_short_backtrace
  22:     0x7f44fde0e1a9 - rustc_query_impl[8681e81019ae3337]::execution::try_execute_query::<rustc_middle[74264659555fab5]::query::caches::SingleCache<rustc_middle[74264659555fab5]::query::erase::ErasedData<[u8; 16usize]>>, false>
  23:     0x7f44fde0dd0e - rustc_query_impl[8681e81019ae3337]::query_impl::resolver_for_lowering_raw::execute_query_non_incr::__rust_end_short_backtrace
  24:     0x7f44fde326be - rustc_interface[64e4eefc34cc1822]::interface::run_compiler::<(), rustc_driver_impl[caf990db37bd39f4]::run_compiler::{closure#0}>::{closure#1}
  25:     0x7f44fddfb87e - std[ea4077504e0ffae5]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[64e4eefc34cc1822]::util::run_in_thread_with_globals<rustc_interface[64e4eefc34cc1822]::util::run_in_thread_pool_with_globals<rustc_interface[64e4eefc34cc1822]::interface::run_compiler<(), rustc_driver_impl[caf990db37bd39f4]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  26:     0x7f44fddfc120 - <std[ea4077504e0ffae5]::thread::lifecycle::spawn_unchecked<rustc_interface[64e4eefc34cc1822]::util::run_in_thread_with_globals<rustc_interface[64e4eefc34cc1822]::util::run_in_thread_pool_with_globals<rustc_interface[64e4eefc34cc1822]::interface::run_compiler<(), rustc_driver_impl[caf990db37bd39f4]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[9903332b54e895af]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  27:     0x7f44fddfcfac - <std[ea4077504e0ffae5]::sys::thread::unix::Thread>::new::thread_start
  28:     0x7f44f78a597a - <unknown>
  29:     0x7f44f79292bc - <unknown>
  30:                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 1.96.0-nightly (212b0d480 2026-03-24) running on x86_64-unknown-linux-gnu

note: compiler flags: -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 6 previous errors

[matthiaskrgr]

mod m1 {
    mod inner {
        pub struct S;
    }
    pub use inner::*;
    #[derive(Debug)]
    pub struct S;
}
use m1::*;
use S;

[matthiaskrgr]

Regression in nightly-2026-01-11
since #150502

[theemathas]

@rust-lang/mods