[ICE]: is not an owner

[matthiaskrgr]

Code

#[warn(rust_2024_prelude_collisions)]
fn main() {
    ().into_future()
}
use future::{IntoFuture};
mod future {
    pub trait IntoFuture {
        fn into_future(&self) {}
    }
    impl IntoFuture for () {}
}

Meta

rustc --version --verbose:

rustc 1.100.0-nightly (5ceaf6608 2026-09-25)
binary: rustc
commit-hash: 5ceaf6608eb354c2f5bbb3b8d974caa367dac81c
commit-date: 2026-09-25
host: x86_64-unknown-linux-gnu
release: 1.100.0-nightly
LLVM version: 23.1.1

Error output

<output>

Backtrace

error: internal compiler error: /rustc-dev/5ceaf6608eb354c2f5bbb3b8d974caa367dac81c/compiler/rustc_middle/src/hir/map.rs:140:32: DefId(0:5 ~ code[4489]::{use#1}::{use#0}) is not an owner
 --> code.rs:5:14
  |
5 | use future::{IntoFuture};
  |              ^^^^^^^^^^


thread 'rustc' (3425717) panicked at /rustc-dev/5ceaf6608eb354c2f5bbb3b8d974caa367dac81c/compiler/rustc_middle/src/hir/map.rs:140:32:
Box<dyn Any>
stack backtrace:
   0:     0x7fe72d410916 - <<std[4e3e5122718436ea]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[df69dfd27f4aceb1]::fmt::Display>::fmt
   1:     0x7fe72da092df - core[df69dfd27f4aceb1]::fmt::write
   2:     0x7fe72d4258dc - <std[4e3e5122718436ea]::sys::stdio::unix::Stderr as core[df69dfd27f4aceb1]::io::write::Write>::write_fmt
   3:     0x7fe72d3e321a - std[4e3e5122718436ea]::panicking::default_hook::{closure#0}
   4:     0x7fe72d404d23 - std[4e3e5122718436ea]::panicking::default_hook
   5:     0x7fe72c168ed6 - std[4e3e5122718436ea]::panicking::update_hook::<alloc[f7b4942899dbd9a8]::boxed::Box<rustc_driver_impl[8a9241412565640d]::install_ice_hook::{closure#1}>>::{closure#0}
   6:     0x7fe72d4051c2 - std[4e3e5122718436ea]::panicking::panic_with_hook
   7:     0x7fe72cf98f71 - std[4e3e5122718436ea]::panicking::begin_panic::<rustc_span[17eb9802bfc7b0b1]::macros::ExplicitBug>::{closure#0}
   8:     0x7fe72cf97abe - std[4e3e5122718436ea]::sys::backtrace::__rust_end_short_backtrace::<std[4e3e5122718436ea]::panicking::begin_panic<rustc_span[17eb9802bfc7b0b1]::macros::ExplicitBug>::{closure#0}, !>
   9:     0x7fe72cf97262 - std[4e3e5122718436ea]::panicking::begin_panic::<rustc_span[17eb9802bfc7b0b1]::macros::ExplicitBug>
  10:     0x7fe729311161 - rustc_span[17eb9802bfc7b0b1]::macros::bug_impl
  11:     0x7fe72dfce470 - <rustc_middle[bcd1109c707c4cd5]::ty::context::TyCtxt>::hir_expect_item
  12:     0x7fe72c4dadb2 - <rustc_hir_typeck[8b455a8928c70169]::fn_ctxt::FnCtxt>::trait_path_or_bare_name
  13:     0x7fe72c562207 - <rustc_hir_typeck[8b455a8928c70169]::method::prelude_edition_lints::AmbiguousTraitMethod as rustc_errors[5a936017551d7df9]::diagnostic::Diagnostic>::into_diag
  14:     0x7fe72c49280e - <rustc_middle[bcd1109c707c4cd5]::lint::emit_lint_base<rustc_hir_typeck[8b455a8928c70169]::method::prelude_edition_lints::AmbiguousTraitMethod, rustc_middle[bcd1109c707c4cd5]::lint::LevelSpec<rustc_lint_defs[b9a46a91eb6606ea]::StableLintExpectationId>>::{closure#0} as core[df69dfd27f4aceb1]::ops::function::FnOnce<(rustc_errors[5a936017551d7df9]::DiagCtxtHandle, rustc_errors[5a936017551d7df9]::Level)>>::call_once::{shim:vtable#0}
  15:     0x7fe72deffb18 - rustc_middle[bcd1109c707c4cd5]::lint::emit_lint_base::emit_lint_base_impl
  16:     0x7fe72db5d5e4 - <rustc_hir_typeck[8b455a8928c70169]::fn_ctxt::FnCtxt>::check_expr_method_call
  17:     0x7fe72e402335 - <rustc_hir_typeck[8b455a8928c70169]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  18:     0x7fe72e3f497f - <rustc_hir_typeck[8b455a8928c70169]::fn_ctxt::FnCtxt>::check_expr_block
  19:     0x7fe72e402309 - <rustc_hir_typeck[8b455a8928c70169]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  20:     0x7fe72e3ed678 - rustc_hir_typeck[8b455a8928c70169]::check::check_fn
  21:     0x7fe72ee5a486 - rustc_hir_typeck[8b455a8928c70169]::typeck_with_inspect::{closure#0}
  22:     0x7fe72ee5893a - rustc_query_impl[658b0b4479b4082]::query_vtables::typeck_root::invoke_provider_fn::__rust_begin_short_backtrace
  23:     0x7fe72e42f6fa - rustc_query_impl[658b0b4479b4082]::execution::try_execute_query::<rustc_data_structures[479a506a1b750eb2]::vec_cache::VecCache<rustc_span[17eb9802bfc7b0b1]::def_id::LocalDefId, rustc_middle[bcd1109c707c4cd5]::query::erase::ErasedData<[u8; 8usize]>, rustc_middle[bcd1109c707c4cd5]::dep_graph::graph::DepNodeIndex>, false>
  24:     0x7fe72e42f32b - rustc_query_impl[658b0b4479b4082]::query_vtables::typeck_root::execute_query_non_incr::__rust_end_short_backtrace
  25:     0x7fe72e07f5fa - <rustc_middle[bcd1109c707c4cd5]::ty::context::TyCtxt>::par_hir_body_owners::<rustc_hir_analysis[ba0aa8f9a0e166c8]::check_crate::{closure#1}>::{closure#0}
  26:     0x7fe72e07eca5 - rustc_hir_analysis[ba0aa8f9a0e166c8]::check_crate
  27:     0x7fe72e42c0fc - rustc_interface[7962de54e6a85a]::passes::analysis
  28:     0x7fe72eb085c7 - rustc_query_impl[658b0b4479b4082]::execution::try_execute_query::<rustc_middle[bcd1109c707c4cd5]::query::caches::SingleCache<rustc_middle[bcd1109c707c4cd5]::query::erase::ErasedData<[u8; 0usize]>>, false>
  29:     0x7fe72eb0836b - rustc_query_impl[658b0b4479b4082]::query_vtables::analysis::execute_query_non_incr::__rust_end_short_backtrace
  30:     0x7fe72eccd6fe - rustc_interface[7962de54e6a85a]::interface::run_compiler::<(), rustc_driver_impl[8a9241412565640d]::run_compiler::{closure#0}>::{closure#2}
  31:     0x7fe72ed135e4 - std[4e3e5122718436ea]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[7962de54e6a85a]::util::run_in_thread_with_globals<rustc_interface[7962de54e6a85a]::util::run_in_thread_pool_with_globals<rustc_interface[7962de54e6a85a]::interface::run_compiler<(), rustc_driver_impl[8a9241412565640d]::run_compiler::{closure#0}>::{closure#2}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  32:     0x7fe72ed1338b - <std[4e3e5122718436ea]::thread::lifecycle::spawn_unchecked<rustc_interface[7962de54e6a85a]::util::run_in_thread_with_globals<rustc_interface[7962de54e6a85a]::util::run_in_thread_pool_with_globals<rustc_interface[7962de54e6a85a]::interface::run_compiler<(), rustc_driver_impl[8a9241412565640d]::run_compiler::{closure#0}>::{closure#2}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[df69dfd27f4aceb1]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  33:     0x7fe72ed1eb5b - <std[4e3e5122718436ea]::sys::thread::unix::Thread>::new::thread_start
  34:     0x7fe727c980a2 - <unknown>
  35:     0x7fe727d2080c - <unknown>
  36:                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: please attach the file at `/home/matthias/vcs/github/CRED/rustc-ice-2026-09-26T12_23_20-3425707.txt` to your bug report

note: rustc 1.100.0-nightly (5ceaf6608 2026-09-25) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [typeck_root] type-checking `main`
#1 [analysis] running analysis passes on crate `code`
end of query stack
error: aborting due to 1 previous error

[matthiaskrgr]

this compiled on beta:

warning: trait method `into_future` will become ambiguous in Rust 2024
 --> code.rs:3:5
  |
3 |     ().into_future()
  |     ^^^^^^^^^^^^^^^^ help: disambiguate the associated function: `IntoFuture::into_future(&())`
  |
  = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2024!
  = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2024/prelude.html>
note: the lint level is defined here
 --> code.rs:1:8
  |
1 | #[warn(rust_2024_prelude_collisions)]
  |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: 1 warning emitted

[matthiaskrgr]

this smells like #161349 because when I change
use future::{IntoFuture};
to
use future::IntoFuture;, the code compiles

[apiraino]

I think I'm doing something wrong, I can't reproduce with the nightly build you indicate. I just run rustc test.rs on your repro and I see no difference with compiling with the beta or stable. Maybe I need some params? 🤔

[matthiaskrgr]

it does reproduce for me with editions 2015 (default) and 2018, 2021.
Did you do this inside a cargo new (which defaults to 2024)?
playground repro:

https://play.rust-lang.org/?version=nightly&mode=debug&edition=2015&gist=b2cb4b611c7907c6dccee0c3080c1869

[Sontran0118]

I reproduced the error in editions 2015, 2018, and 2021. The same error also showed up in this code:

fn main() {
    ().try_into()
}
use conv::{TryIntoLike};
mod conv {
    pub trait TryIntoLike {
        fn try_into(&self) {}
    }
    impl TryIntoLike for () {}
}