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1.100 beta crater regression: ICE "is not an owner" #164084
Description
This regression was discovered in the 1.100 beta crater run.
[INFO] [stdout] warning: trait method `into_iter` will become ambiguous in Rust 2021
[INFO] [stdout] --> examples/into_iter.rs:17:30
[INFO] [stdout] |
[INFO] [stdout] 17 | let flattened: Vec<u8> = vecs_array
[INFO] [stdout] | ______________________________^
[INFO] [stdout] 18 | | .into_iter()
[INFO] [stdout] | |____________________________________________^ help: disambiguate the associated function: `ArrayIntoIter::into_iter(vecs_array)`
[INFO] [stdout] |
[INFO] [stdout] = warning: this changes meaning in Rust 2021
[INFO] [stdout] = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] = note: `#[warn(array_into_iter)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout]
[INFO] [stdout]
[INFO] [stdout] warning: trait method `into_iter` will become ambiguous in Rust 2021
[INFO] [stdout] --> tests/basic.rs:170:18
[INFO] [stdout] |
[INFO] [stdout] 170 | Vec::from_iter(NUMBERS.into_iter()),
[INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^ help: disambiguate the associated function: `ArrayIntoIter::into_iter(NUMBERS)`
[INFO] [stdout] |
[INFO] [stdout] = warning: this changes meaning in Rust 2021
[INFO] [stdout] = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] = note: `#[warn(array_into_iter)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] error: internal compiler error: /rustc-dev/e3feeb59cd1bdd011a2bfcc0747b55125d9b8527/compiler/rustc_middle/src/hir/map.rs:141:32: DefId(0:7 ~ stackvec[f77c]::prelude::{use#0}::{use#1}) is not an owner
[INFO] [stdout] --> src/lib.rs:37:9
[INFO] [stdout] |
[INFO] [stdout] 37 | ArrayIntoIter,
[INFO] [stdout] | ^^^^^^^^^^^^^
https://crater-reports.s3.amazonaws.com/beta-1.100-3/1.100.0-beta.1/reg/stackvec-0.2.1/log.txt
Possibly related to #163374
Activity
Kuksgauzen commentedon Oct 10, 2026
Same ICE as #163374, so this looks like a duplicate. The MCVE there bisects to #161349: #163374 (comment)
stackvec 0.2.1(from crates.io; it sets noedition, so 2015) reproduces withcargo +beta build --all-targets(1.100.0-beta.4) and builds fine on 1.99.0. A plaincargo builddoes not trigger it: the ICE comes from building the tests and examples, as crater does. The backtrace goes through the sametrait_path_or_bare_name→hir_expect_itempath, and bisectingstackvecon the CI builds around the merge (--start f7575a9da8e4 --end 0d38a842626a) gives the same commit,0d38a842626a(#161349).One difference from the #163374 MCVE: here the lint is
array_into_iter, which is warn-by-default, so no attribute is needed. Reduced fromstackvec, this ICEs on 1.100.0-beta.4 and nightly-2026-10-10 (32dba69d6) withrustc --edition 2015or--edition 2018, compiles with a warning on 1.99.0, and also bisects to0d38a842626a:With
use iter::ArrayIntoIter;(no braces) it compiles fine. So edition 2015/2018 code can hit this with default lint levels: it takes an.into_iter()call on an array plus a same-named trait method imported through auselist.@rustbot label -E-needs-bisection -E-needs-mcve +S-has-bisection +S-has-mcve
theemathas commentedon Oct 11, 2026
@Kuksgauzen Thank you for contributing! Although, I would like to note our LLM policy. LLM text tends to contain excessive unnecessary information and be overly verbose. Many people find such text unpleasant to read. So, we would prefer that you manually summarize the LLM output. Thanks!