test new solver on CI until stabilization by lqd · Pull Request #156146 · rust-lang/rust

lqd · 2026-05-04T15:06:41Z

We need the new solver to be able to build the stdlib, and this has regressed in the recent past. Things are broken right now, and we want to ensure this keeps working until stabilization later this year.

I've added this to the x86_64-gnu-llvm-XX job (note no -1/2/3 suffix) so it's run on PR and auto CI, and because it's roughly the fastest of these builders, though maybe the aarch64 llvm 1 and 2 are slightly faster.

Building the stage 1 ./x build library/ is generally quite quick, a couple minutes at most.

The new solver fix to build std is from @lcnr on zulip.
r? @marcoieni

lqd · 2026-05-04T15:07:37Z

Things are currently broken, the job should fail if this is working.

rust-log-analyzer · 2026-05-04T16:44:16Z

The job x86_64-gnu-llvm-21 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

not yet implemented: Iterator is not yet const
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: <rustc_type_ir::predicate::HostEffectPredicate<rustc_middle::ty::context::TyCtxt> as rustc_next_trait_solver::solve::assembly::GoalKind<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::consider_builtin_iterator_candidate
   3: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::assemble_and_evaluate_candidates::<rustc_type_ir::predicate::HostEffectPredicate<rustc_middle::ty::context::TyCtxt>>
   4: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::compute_host_effect_goal
   5: <rustc_infer::infer::InferCtxt as rustc_type_ir::infer_ctxt::InferCtxtLike>::enter_forall::<rustc_type_ir::predicate_kind::PredicateKind<rustc_middle::ty::context::TyCtxt>, core::result::Result<rustc_type_ir::canonical::Canonical<rustc_middle::ty::context::TyCtxt, rustc_type_ir::solve::Response<rustc_middle::ty::context::TyCtxt>>, rustc_type_ir::solve::NoSolution>, <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::enter_forall<rustc_type_ir::predicate_kind::PredicateKind<rustc_middle::ty::context::TyCtxt>, core::result::Result<rustc_type_ir::canonical::Canonical<rustc_middle::ty::context::TyCtxt, rustc_type_ir::solve::Response<rustc_middle::ty::context::TyCtxt>>, rustc_type_ir::solve::NoSolution>, <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::compute_goal::{closure#0}>::{closure#0}>
   6: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::enter_canonical::<core::result::Result<rustc_type_ir::canonical::Canonical<rustc_middle::ty::context::TyCtxt, rustc_type_ir::solve::Response<rustc_middle::ty::context::TyCtxt>>, rustc_type_ir::solve::NoSolution>, <rustc_next_trait_solver::solve::search_graph::SearchGraphDelegate<rustc_trait_selection::solve::delegate::SolverDelegate> as rustc_type_ir::search_graph::Delegate>::compute_goal::{closure#0}::{closure#0}>
   7: <rustc_next_trait_solver::solve::search_graph::SearchGraphDelegate<rustc_trait_selection::solve::delegate::SolverDelegate> as rustc_type_ir::search_graph::Delegate>::compute_goal
   8: <rustc_type_ir::search_graph::SearchGraph<rustc_next_trait_solver::solve::search_graph::SearchGraphDelegate<rustc_trait_selection::solve::delegate::SolverDelegate>, rustc_middle::ty::context::TyCtxt>>::evaluate_goal_in_task
   9: <rustc_middle::dep_graph::graph::DepGraph>::with_anon_task::<<rustc_type_ir::search_graph::SearchGraph<rustc_next_trait_solver::solve::search_graph::SearchGraphDelegate<rustc_trait_selection::solve::delegate::SolverDelegate>, rustc_middle::ty::context::TyCtxt>>::evaluate_goal::{closure#0}::{closure#2}, rustc_type_ir::search_graph::EvaluationResult<rustc_middle::ty::context::TyCtxt>>
  10: <rustc_type_ir::search_graph::SearchGraph<rustc_next_trait_solver::solve::search_graph::SearchGraphDelegate<rustc_trait_selection::solve::delegate::SolverDelegate>, rustc_middle::ty::context::TyCtxt>>::evaluate_goal
  11: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::evaluate_goal_raw
  12: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::evaluate_goal
  13: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::enter_root::<core::result::Result<rustc_next_trait_solver::solve::GoalEvaluation<rustc_middle::ty::context::TyCtxt>, rustc_type_ir::solve::NoSolution>, <rustc_trait_selection::solve::delegate::SolverDelegate as rustc_next_trait_solver::solve::eval_ctxt::SolverDelegateEvalExt>::evaluate_root_goal::{closure#0}::{closure#0}>
  14: <rustc_trait_selection::solve::delegate::SolverDelegate as rustc_next_trait_solver::solve::eval_ctxt::SolverDelegateEvalExt>::evaluate_root_goal
  15: <rustc_trait_selection::solve::fulfill::FulfillmentCtxt<rustc_trait_selection::traits::FulfillmentError> as rustc_infer::traits::engine::TraitEngine<rustc_trait_selection::traits::FulfillmentError>>::try_evaluate_obligations
  16: <rustc_trait_selection::solve::fulfill::FulfillmentCtxt<rustc_trait_selection::traits::FulfillmentError> as rustc_infer::traits::engine::TraitEngine<rustc_trait_selection::traits::FulfillmentError>>::evaluate_obligations_error_on_ambiguity
  17: rustc_hir_analysis::check::wfcheck::enter_wf_checking_ctxt::<rustc_hir_analysis::check::wfcheck::check_impl::{closure#0}>
  18: rustc_hir_analysis::check::wfcheck::check_impl
  19: rustc_hir_analysis::check::wfcheck::check_item
  20: rustc_hir_analysis::check::check::check_item_type
  21: rustc_hir_analysis::check::wfcheck::check_well_formed
      [... omitted 2 frames ...]
  22: rustc_middle::query::inner::query_ensure_result::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 1]>, rustc_middle::dep_graph::graph::DepNodeIndex>, ()>
  23: rustc_data_structures::sync::parallel::try_par_for_each_in::<&[rustc_hir::hir::ItemId], rustc_span::ErrorGuaranteed, <rustc_middle::hir::ModuleItems>::par_items<rustc_hir_analysis::check::wfcheck::check_type_wf::{closure#0}>::{closure#0}>
  24: rustc_hir_analysis::check::wfcheck::check_type_wf
      [... omitted 2 frames ...]
  25: rustc_hir_analysis::check_crate
  26: rustc_interface::passes::analysis
      [... omitted 2 frames ...]
  27: <std::thread::local::LocalKey<core::cell::Cell<*const ()>>>::with::<rustc_middle::ty::context::tls::enter_context<<rustc_middle::ty::context::GlobalCtxt>::enter<rustc_interface::passes::create_and_enter_global_ctxt<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}, core::option::Option<rustc_interface::queries::Linker>>::{closure#1}, core::option::Option<rustc_interface::queries::Linker>>::{closure#0}, core::option::Option<rustc_interface::queries::Linker>>
  28: <rustc_middle::ty::context::TyCtxt>::create_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_interface::passes::create_and_enter_global_ctxt<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}>
  29: rustc_interface::passes::create_and_enter_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>
  30: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
  31: rustc_span::create_session_globals_then::<(), rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}::{closure#0}>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

---
warning: the ICE couldn't be written to `/checkout/rustc-ice-2026-05-04T16_43_54-314277.txt`: Read-only file system (os error 30)

note: rustc 1.97.0-nightly (cd2a9a1b6 2026-05-04) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib -Z embed-metadata=no -C opt-level=3 -C embed-bitcode=no -C codegen-units=1 -C embed-bitcode=yes -Z unstable-options -C force-frame-pointers=non-leaf -C debug-assertions=on -C linker=x86_64-linux-gnu-gcc -C symbol-mangling-version=v0 -Z annotate-moves -Z randomize-layout -Z unstable-options -Z macro-backtrace -C split-debuginfo=off -C prefer-dynamic -C llvm-args=-import-instr-limit=10 -Z inline-mir -Z inline-mir-preserve-debug -Z mir_strip_debuginfo=locals-in-tiny-functions -C link-args=-Wl,-z,origin -C link-args=-Wl,-rpath,$ORIGIN/../lib -Z crate-attr=doc(html_root_url="https://doc.rust-lang.org/nightly/") -Z next-solver=globally -Z binary-dep-depinfo -Z force-unstable-if-unmarked

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [check_well_formed] checking that `option::<impl at library/core/src/option.rs:2489:1: 2489:35>` is well-formed
#1 [check_type_wf] checking that types are well-formed
#2 [analysis] running analysis passes on crate `core`
end of query stack

thread 'rustc' (314290) panicked at compiler/rustc_next_trait_solver/src/solve/effect_goals.rs:374:9:
not yet implemented: Iterator is not yet const
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: <rustc_type_ir::predicate::HostEffectPredicate<rustc_middle::ty::context::TyCtxt> as rustc_next_trait_solver::solve::assembly::GoalKind<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::consider_builtin_iterator_candidate
   3: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::assemble_and_evaluate_candidates::<rustc_type_ir::predicate::HostEffectPredicate<rustc_middle::ty::context::TyCtxt>>
   4: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::compute_host_effect_goal
   5: <rustc_infer::infer::InferCtxt as rustc_type_ir::infer_ctxt::InferCtxtLike>::enter_forall::<rustc_type_ir::predicate_kind::PredicateKind<rustc_middle::ty::context::TyCtxt>, core::result::Result<rustc_type_ir::canonical::Canonical<rustc_middle::ty::context::TyCtxt, rustc_type_ir::solve::Response<rustc_middle::ty::context::TyCtxt>>, rustc_type_ir::solve::NoSolution>, <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::enter_forall<rustc_type_ir::predicate_kind::PredicateKind<rustc_middle::ty::context::TyCtxt>, core::result::Result<rustc_type_ir::canonical::Canonical<rustc_middle::ty::context::TyCtxt, rustc_type_ir::solve::Response<rustc_middle::ty::context::TyCtxt>>, rustc_type_ir::solve::NoSolution>, <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::compute_goal::{closure#0}>::{closure#0}>
   6: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::enter_canonical::<core::result::Result<rustc_type_ir::canonical::Canonical<rustc_middle::ty::context::TyCtxt, rustc_type_ir::solve::Response<rustc_middle::ty::context::TyCtxt>>, rustc_type_ir::solve::NoSolution>, <rustc_next_trait_solver::solve::search_graph::SearchGraphDelegate<rustc_trait_selection::solve::delegate::SolverDelegate> as rustc_type_ir::search_graph::Delegate>::compute_goal::{closure#0}::{closure#0}>
   7: <rustc_next_trait_solver::solve::search_graph::SearchGraphDelegate<rustc_trait_selection::solve::delegate::SolverDelegate> as rustc_type_ir::search_graph::Delegate>::compute_goal
   8: <rustc_type_ir::search_graph::SearchGraph<rustc_next_trait_solver::solve::search_graph::SearchGraphDelegate<rustc_trait_selection::solve::delegate::SolverDelegate>, rustc_middle::ty::context::TyCtxt>>::evaluate_goal_in_task
   9: <rustc_middle::dep_graph::graph::DepGraph>::with_anon_task::<<rustc_type_ir::search_graph::SearchGraph<rustc_next_trait_solver::solve::search_graph::SearchGraphDelegate<rustc_trait_selection::solve::delegate::SolverDelegate>, rustc_middle::ty::context::TyCtxt>>::evaluate_goal::{closure#0}::{closure#2}, rustc_type_ir::search_graph::EvaluationResult<rustc_middle::ty::context::TyCtxt>>
  10: <rustc_type_ir::search_graph::SearchGraph<rustc_next_trait_solver::solve::search_graph::SearchGraphDelegate<rustc_trait_selection::solve::delegate::SolverDelegate>, rustc_middle::ty::context::TyCtxt>>::evaluate_goal
  11: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::evaluate_goal_raw
  12: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::evaluate_goal
  13: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::enter_root::<core::result::Result<rustc_next_trait_solver::solve::GoalEvaluation<rustc_middle::ty::context::TyCtxt>, rustc_type_ir::solve::NoSolution>, <rustc_trait_selection::solve::delegate::SolverDelegate as rustc_next_trait_solver::solve::eval_ctxt::SolverDelegateEvalExt>::evaluate_root_goal::{closure#0}::{closure#0}>
  14: <rustc_trait_selection::solve::delegate::SolverDelegate as rustc_next_trait_solver::solve::eval_ctxt::SolverDelegateEvalExt>::evaluate_root_goal
  15: <rustc_trait_selection::solve::fulfill::FulfillmentCtxt<rustc_trait_selection::traits::FulfillmentError> as rustc_infer::traits::engine::TraitEngine<rustc_trait_selection::traits::FulfillmentError>>::try_evaluate_obligations
  16: <rustc_trait_selection::solve::fulfill::FulfillmentCtxt<rustc_trait_selection::traits::FulfillmentError> as rustc_infer::traits::engine::TraitEngine<rustc_trait_selection::traits::FulfillmentError>>::evaluate_obligations_error_on_ambiguity
  17: rustc_hir_analysis::check::wfcheck::enter_wf_checking_ctxt::<rustc_hir_analysis::check::wfcheck::check_impl::{closure#0}>
  18: rustc_hir_analysis::check::wfcheck::check_impl
  19: rustc_hir_analysis::check::wfcheck::check_item
  20: rustc_hir_analysis::check::check::check_item_type
  21: rustc_hir_analysis::check::wfcheck::check_well_formed
      [... omitted 2 frames ...]
  22: rustc_middle::query::inner::query_ensure_result::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 1]>, rustc_middle::dep_graph::graph::DepNodeIndex>, ()>
  23: rustc_data_structures::sync::parallel::try_par_for_each_in::<&[rustc_hir::hir::ItemId], rustc_span::ErrorGuaranteed, <rustc_middle::hir::ModuleItems>::par_items<rustc_hir_analysis::check::wfcheck::check_type_wf::{closure#0}>::{closure#0}>
  24: rustc_hir_analysis::check::wfcheck::check_type_wf
      [... omitted 2 frames ...]
  25: rustc_hir_analysis::check_crate
  26: rustc_interface::passes::analysis
      [... omitted 2 frames ...]
  27: <std::thread::local::LocalKey<core::cell::Cell<*const ()>>>::with::<rustc_middle::ty::context::tls::enter_context<<rustc_middle::ty::context::GlobalCtxt>::enter<rustc_interface::passes::create_and_enter_global_ctxt<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}, core::option::Option<rustc_interface::queries::Linker>>::{closure#1}, core::option::Option<rustc_interface::queries::Linker>>::{closure#0}, core::option::Option<rustc_interface::queries::Linker>>
  28: <rustc_middle::ty::context::TyCtxt>::create_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_interface::passes::create_and_enter_global_ctxt<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}>
  29: rustc_interface::passes::create_and_enter_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>
  30: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
  31: rustc_span::create_session_globals_then::<(), rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}::{closure#0}>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

---
warning: the ICE couldn't be written to `/checkout/rustc-ice-2026-05-04T16_43_54-314277.txt`: Read-only file system (os error 30)

note: rustc 1.97.0-nightly (cd2a9a1b6 2026-05-04) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib -Z embed-metadata=no -C opt-level=3 -C embed-bitcode=no -C codegen-units=1 -C embed-bitcode=yes -Z unstable-options -C force-frame-pointers=non-leaf -C debug-assertions=on -C linker=x86_64-linux-gnu-gcc -C symbol-mangling-version=v0 -Z annotate-moves -Z randomize-layout -Z unstable-options -Z macro-backtrace -C split-debuginfo=off -C prefer-dynamic -C llvm-args=-import-instr-limit=10 -Z inline-mir -Z inline-mir-preserve-debug -Z mir_strip_debuginfo=locals-in-tiny-functions -C link-args=-Wl,-z,origin -C link-args=-Wl,-rpath,$ORIGIN/../lib -Z crate-attr=doc(html_root_url="https://doc.rust-lang.org/nightly/") -Z next-solver=globally -Z binary-dep-depinfo -Z force-unstable-if-unmarked

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [check_well_formed] checking that `option::<impl at library/core/src/option.rs:2624:1: 2624:39>` is well-formed
#1 [check_type_wf] checking that types are well-formed
#2 [analysis] running analysis passes on crate `core`
end of query stack
[RUSTC-TIMING] core test:false 9.615
error: could not compile `core` (lib)

Caused by:
  process didn't exit successfully: `/checkout/obj/build/bootstrap/debug/rustc /checkout/obj/build/bootstrap/debug/rustc --crate-name core --edition=2024 library/core/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -Z embed-metadata=no -C opt-level=3 -C embed-bitcode=no -C codegen-units=1 --warn=unexpected_cfgs --check-cfg 'cfg(no_fp_fmt_parse)' --check-cfg 'cfg(feature, values(any()))' --check-cfg 'cfg(target_has_reliable_f16)' --check-cfg 'cfg(target_has_reliable_f16_math)' --check-cfg 'cfg(target_has_reliable_f128)' --check-cfg 'cfg(target_has_reliable_f128_math)' --check-cfg 'cfg(llvm_enzyme)' -Cembed-bitcode=yes -Zunstable-options -Cforce-frame-pointers=non-leaf -C debug-assertions=on --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("debug_refcell", "llvm_enzyme", "optimize_for_size", "panic_immediate_abort"))' -C metadata=dde19948ccf83c58 -C extra-filename=-e83a4e64eb71976e --out-dir /checkout/obj/build/x86_64-unknown-linux-gnu/stage1-std/i686-unknown-linux-gnu/dist/deps --target i686-unknown-linux-gnu -C linker=x86_64-linux-gnu-gcc -L dependency=/checkout/obj/build/x86_64-unknown-linux-gnu/stage1-std/i686-unknown-linux-gnu/dist/deps -L dependency=/checkout/obj/build/x86_64-unknown-linux-gnu/stage1-std/dist/deps -Csymbol-mangling-version=v0 -Zannotate-moves -Zrandomize-layout '--check-cfg=cfg(feature,values(any()))' -Zunstable-options -Zmacro-backtrace -Csplit-debuginfo=off -Cprefer-dynamic -Cllvm-args=-import-instr-limit=10 --cfg=randomized_layouts -Zinline-mir -Zinline-mir-preserve-debug -Zmir_strip_debuginfo=locals-in-tiny-functions -Clink-args=-Wl,-z,origin '-Clink-args=-Wl,-rpath,$ORIGIN/../lib' -Alinker-messages '-Zcrate-attr=doc(html_root_url="https://doc.rust-lang.org/nightly/")' -Znext-solver=globally -Z binary-dep-depinfo` (exit status: 101)
Bootstrap failed while executing `--stage 1 build library --host= --target=i686-unknown-linux-gnu`
Build completed unsuccessfully in 0:00:12
  local time: Mon May  4 16:44:03 UTC 2026
  network time: Mon, 04 May 2026 16:44:04 GMT
##[error]Process completed with exit code 1.

lqd · 2026-05-07T09:44:27Z

-#
-# This is intended to make sure that both `--pass=check` continues to
-# work.
+# Run the UI test suite in `--pass=check` mode, to ensure it continues to work.


Fixing this comment made me realize running the mir-opt tests and --pass=check is duplicated in this job and in the llvm-2 jobs here

rust/src/ci/docker/scripts/x86_64-gnu-llvm2.sh

Lines 9 to 21 in 0e5924a

# Run the `mir-opt` tests again but this time for a 32-bit target.

# This enforces that tests using `// EMIT_MIR_FOR_EACH_BIT_WIDTH` have

# both 32-bit and 64-bit outputs updated by the PR author, before

# the PR is approved and tested for merging.

# It will also detect tests lacking `// EMIT_MIR_FOR_EACH_BIT_WIDTH`,

# despite having different output on 32-bit vs 64-bit targets.

../x --stage 2 test tests/mir-opt --host='' --target=i686-unknown-linux-gnu

# Run the UI test suite again, but in `--pass=check` mode

#

# This is intended to make sure that both `--pass=check` continues to

# work.

../x.ps1 --stage 2 test tests/ui --pass=check --host='' --target=i686-unknown-linux-gnu

So we could slightly optimize either job by removing these two tasks (the mir-opt tests are very fast, but running --pass=check UI tests can take a few minutes depending on the machine). I could take care of that in another PR if you want?

View changes since the review

yes, sure, thanks!

We need it to be able to build the stdlib, and this has regressed in the recent past.

this is lcnr's solution

rustbot · 2026-05-08T19:06:16Z

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

lqd · 2026-05-08T19:06:36Z

Rebased to fix conflict

marcoieni · 2026-05-18T15:53:28Z

In this run, this job took the same as another job, so adding this additional test should be fine. If this job becomes too slow we can think about adding another PR job.

@bors r+

rust-bors · 2026-05-18T15:53:31Z

📌 Commit f243f57 has been approved by marcoieni

It is now in the queue for this repository.

…uwer Rollup of 3 pull requests Successful merges: - #156146 (test new solver on CI until stabilization) - #155840 (prefer `T::IS_ZST` over manual check) - #156723 (Update books)

rustbot added the WG-trait-system-refactor The Rustc Trait System Refactor Initiative (-Znext-solver) label May 4, 2026

lqd commented May 7, 2026

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lqd marked this pull request as ready for review May 7, 2026 09:47

rustbot assigned marcoieni May 7, 2026

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels May 7, 2026

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lqd added 3 commits May 8, 2026 20:59

test new solver on CI until stabilization

8b70a6f

We need it to be able to build the stdlib, and this has regressed in the recent past.

work around const Iterator failure with new solver

0512079

this is lcnr's solution

fix comment

f243f57

lqd force-pushed the new-solver-ci-std branch from aab502c to f243f57 Compare May 8, 2026 19:06

rust-bors Bot added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 18, 2026

JonathanBrouwer mentioned this pull request May 18, 2026

Rollup of 3 pull requests #156728

Merged

rust-bors Bot merged commit d42d8e0 into rust-lang:main May 19, 2026
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rustbot added this to the 1.97.0 milestone May 19, 2026

lqd deleted the new-solver-ci-std branch May 19, 2026 21:18

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test new solver on CI until stabilization#156146

test new solver on CI until stabilization#156146
rust-bors[bot] merged 3 commits into
rust-lang:mainfrom
lqd:new-solver-ci-std

lqd commented May 4, 2026 •

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lqd May 7, 2026 •

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	# Run the `mir-opt` tests again but this time for a 32-bit target.
	# This enforces that tests using `// EMIT_MIR_FOR_EACH_BIT_WIDTH` have
	# both 32-bit and 64-bit outputs updated by the PR author, before
	# the PR is approved and tested for merging.
	# It will also detect tests lacking `// EMIT_MIR_FOR_EACH_BIT_WIDTH`,
	# despite having different output on 32-bit vs 64-bit targets.
	../x --stage 2 test tests/mir-opt --host='' --target=i686-unknown-linux-gnu

	# Run the UI test suite again, but in `--pass=check` mode
	#
	# This is intended to make sure that both `--pass=check` continues to
	# work.
	../x.ps1 --stage 2 test tests/ui --pass=check --host='' --target=i686-unknown-linux-gnu

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lqd commented May 4, 2026 •

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lqd May 7, 2026 •

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