Resolver: Batched Import Resolution #145108

LorrensP-2158466 · 2025-08-08T15:54:37Z

Transforms the current algorithm for resolving imports to a batched algorithm. Every import in the indeterminate_imports set is resolved in isolation. This is the only real difference from the current algorithm.

r? petrochenkov

compiler/rustc_resolve/src/lib.rs

compiler/rustc_resolve/src/imports.rs

LorrensP-2158466 · 2025-08-11T19:29:42Z

Code looks a little better now and should be more correct than the previous commits, but I have yet to find a way to resolve the current test failures.

LorrensP-2158466 · 2025-08-11T20:34:04Z

Okey, I did fix core not being built, but those other errors happened again. We now resolve the prelude import path when we create such an import at build_reduced_graph phase.

petrochenkov · 2025-08-11T22:39:59Z

Could you update the tests to make CI green, so I can see the difference?
(Even if the changes do not seem correct.)

tests/ui/imports/ambiguous-9.rs

tests/ui/imports/glob-conflict-cross-crate-1.rs

tests/ui/proc-macro/derive-helper-legacy-spurious.rs

petrochenkov · 2025-08-12T17:43:51Z

Moving prelude_import processing to build_reduced_graph may also be necessary for #139493.

LorrensP-2158466 · 2025-08-12T17:49:54Z

I'll create a pr for it.

compiler/rustc_resolve/src/imports.rs

…etrochenkov Test: Ambigious bindings in same namespace with the same res Add a test based on the discussion [here](https://rust-lang.zulipchat.com/#narrow/channel/421156-gsoc/topic/Project.3A.20Parallel.20Macro.20Expansion/near/542316157) and related to #145575 (comment). This is the most reduced form I could create that passes on nightly but fails with #145108 (see [#gsoc > Project: Parallel Macro Expansion @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/421156-gsoc/topic/Project.3A.20Parallel.20Macro.20Expansion/near/542335131)). Also not sure about the test names. r? `@petrochenkov`

…etrochenkov Test: Ambigious bindings in same namespace with the same res Add a test based on the discussion [here](https://rust-lang.zulipchat.com/#narrow/channel/421156-gsoc/topic/Project.3A.20Parallel.20Macro.20Expansion/near/542316157) and related to rust-lang/rust#145575 (comment). This is the most reduced form I could create that passes on nightly but fails with rust-lang/rust#145108 (see [#gsoc > Project: Parallel Macro Expansion @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/421156-gsoc/topic/Project.3A.20Parallel.20Macro.20Expansion/near/542335131)). Also not sure about the test names. r? `@petrochenkov`

Collect side effects from the current set of undetermined imports and only apply them at the end.

rustbot · 2025-10-08T14:13:22Z

This PR was rebased onto a different master 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.

LorrensP-2158466 · 2025-10-08T14:16:25Z

Rebased to get the changes from my previous PR.

LorrensP-2158466 · 2025-10-08T14:54:16Z

Ah right, that test.

LorrensP-2158466 · 2025-10-08T15:11:05Z

@petrochenkov I have reverted that change in finalize_resolutions_in, so you can run crater on that if needed. In the mean time i'll try and implemented as you suggested in the zulip thread.

petrochenkov · 2025-10-09T17:19:38Z

@petrochenkov I have reverted that change in finalize_resolutions_in, so you can run crater on that if needed. In the mean time i'll try and implemented as you suggested in the zulip thread.

Please, set the waiting-on-review label if something is needed from me, otherwise it gets lost easily.
@bors try

…=<try> Resolver: Batched Import Resolution

LorrensP-2158466 · 2025-10-09T17:21:23Z

Please, set the waiting-on-review label if something is needed from me, otherwise it gets lost easily.

Ah right, sorry!

rust-bors · 2025-10-09T19:30:47Z

☀️ Try build successful (CI)
Build commit: 2278ef2 (2278ef25f90817c20d6dd0d2da58a990eb6f53cb, parent: 0b278a539440be291466ea463a9b6310eaf4d7bb)

petrochenkov · 2025-10-09T20:37:35Z

@craterbot check

craterbot · 2025-10-09T20:37:55Z

👌 Experiment pr-145108-1 created and queued.
🤖 Automatically detected try build 2278ef2
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2025-10-09T20:39:06Z

🚧 Experiment pr-145108-1 is now running

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2025-10-11T13:09:21Z

🎉 Experiment pr-145108-1 is completed!
📊 195 regressed and 3 fixed (713837 total)
📊 1734 spurious results on the retry-regessed-list.txt, consider a retry¹ if this is a significant amount.
📰 Open the summary report.

⚠️ If you notice any spurious failure please add them to the denylist!
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

re-run the experiment with crates=https://crater-reports.s3.amazonaws.com/pr-145108-1/retry-regressed-list.txt ↩

…etrochenkov Test: Ambigious bindings in same namespace with the same res Add a test based on the discussion [here](https://rust-lang.zulipchat.com/#narrow/channel/421156-gsoc/topic/Project.3A.20Parallel.20Macro.20Expansion/near/542316157) and related to rust-lang/rust#145575 (comment). This is the most reduced form I could create that passes on nightly but fails with rust-lang/rust#145108 (see [#gsoc > Project: Parallel Macro Expansion @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/421156-gsoc/topic/Project.3A.20Parallel.20Macro.20Expansion/near/542335131)). Also not sure about the test names. r? `@petrochenkov`

rustbot assigned petrochenkov Aug 8, 2025

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LorrensP-2158466 marked this pull request as ready for review August 11, 2025 08:37

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LorrensP-2158466 force-pushed the batched-import-resolution branch from a3f8ae2 to 4a2a0dc Compare August 11, 2025 20:37

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LorrensP-2158466 added 7 commits October 8, 2025 16:12

Resolver: Batched import resolution.

ee4faf9

Collect side effects from the current set of undetermined imports and only apply them at the end.

Several logical changes.

08235d4

Report glob errors in first phase of commit.

2043b9c

disallow ambiguous names imported from external crates

0a23ecc

bless test

c07c81e

revert change in finalize_resolutions_in + other small things

51f18e4

bless test for green CI

0bd2ce4

LorrensP-2158466 force-pushed the batched-import-resolution branch from 0eba015 to 0bd2ce4 Compare October 8, 2025 14:13

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bless another test

8f39eee

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rust-bors bot added a commit that referenced this pull request Oct 9, 2025

Auto merge of #145108 - LorrensP-2158466:batched-import-resolution, r…

2278ef2

…=<try> Resolver: Batched Import Resolution

petrochenkov added S-waiting-on-crater Status: Waiting on a crater run to be completed. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Oct 9, 2025

craterbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-crater Status: Waiting on a crater run to be completed. labels Oct 11, 2025

Resolver: Batched Import Resolution #145108

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