normalize in `trait_ref_is_knowable` in new solver #114457

lcnr · 2023-08-04T10:20:33Z

fixes rust-lang/trait-system-refactor-initiative#51

Alternatively we could avoid normalizing the self type and do this at the end of the assemble_candidates_via_self_ty stack by splitting candidates into:

applicable without normalizing self type
applicable for aliases, even if they can be normalized
applicable for stuff which cannot get normalized further

I don't think this would have any significant benefits and it also seems non-trivial to avoid normalizing only the self type in trait_ref_is_knowable.

r? @compiler-errors

rustbot · 2023-08-04T10:20:40Z

Some changes occurred to the core trait solver

cc @rust-lang/initiative-trait-system-refactor

compiler-errors · 2023-08-04T15:57:56Z

compiler/rustc_trait_selection/src/solve/assembly/mod.rs

+            #[derive(Debug)]
+            enum FailureKind {
+                Overflow,
+                NoSolution(NoSolution),
+            }


Do you think lazy_normalize_ty should just return this FailureKind?

hmm, I think it's valuable to guarantee that trait_ref_is_knowable always returns the outer Ok when used outside of the new solver

compiler-errors

r=me nit or not

bors · 2023-08-05T06:26:59Z

☔ The latest upstream changes (presumably #114492) made this pull request unmergeable. Please resolve the merge conflicts.

lcnr · 2023-08-07T20:16:17Z

@bors r=compiler-errors rollup

bors · 2023-08-07T20:16:20Z

📌 Commit ff150f9 has been approved by compiler-errors

It is now in the queue for this repository.

compiler-errors · 2023-08-07T20:58:48Z

@bors r-

looks like we're hitting that stability assertion :(

lcnr · 2023-08-08T07:58:42Z

that sure is a nice way to get a minimized test ✨

lcnr · 2023-08-08T14:34:07Z

lowered the stability check to a warn! and accepted it with a FIXME. It is non-trivial to fix and by keeping it as a warn we should be able to actually keep it enabled while testing stuff.

lcnr · 2023-08-08T15:48:06Z

see rust-lang/trait-system-refactor-initiative#54 for an issue tracking the evaluate goal instability bug.

@bors r=compiler-errors rollup (new solver)

bors · 2023-08-08T15:48:08Z

📌 Commit 48b5dbd has been approved by compiler-errors

It is now in the queue for this repository.

…ze, r=compiler-errors normalize in `trait_ref_is_knowable` in new solver fixes rust-lang/trait-system-refactor-initiative#51 Alternatively we could avoid normalizing the self type and do this at the end of the `assemble_candidates_via_self_ty` stack by splitting candidates into: - applicable without normalizing self type - applicable for aliases, even if they can be normalized - applicable for stuff which cannot get normalized further I don't think this would have any significant benefits and it also seems non-trivial to avoid normalizing only the self type in `trait_ref_is_knowable`. r? `@compiler-errors`

compiler-errors · 2023-08-08T18:54:52Z

compiler/rustc_trait_selection/src/solve/eval_ctxt.rs

        }

        Ok((has_changed, certainty, nested_goals))
    }

+    fn check_evaluate_goal_stable_result(


This check should even when debug assertions are enabled -- otherwise, there's UI test instability between rustc w/ debug_assertions and not.

compiler-errors · 2023-08-08T18:55:14Z

Failed in rollup

@bors r-

#114632 (comment)

lcnr · 2023-08-10T12:45:09Z

rebased on top of #114694 so evaluate_goal is stable now. Marking it as blocked on this PR

compiler-errors · 2023-08-12T18:51:54Z

@bors r+

bors · 2023-08-12T18:51:58Z

📌 Commit 5176288 has been approved by compiler-errors

It is now in the queue for this repository.

…ze, r=compiler-errors normalize in `trait_ref_is_knowable` in new solver fixes rust-lang/trait-system-refactor-initiative#51 Alternatively we could avoid normalizing the self type and do this at the end of the `assemble_candidates_via_self_ty` stack by splitting candidates into: - applicable without normalizing self type - applicable for aliases, even if they can be normalized - applicable for stuff which cannot get normalized further I don't think this would have any significant benefits and it also seems non-trivial to avoid normalizing only the self type in `trait_ref_is_knowable`. r? `@compiler-errors`

bors · 2023-08-13T05:18:30Z

⌛ Testing commit 5176288 with merge 7455aa5...

bors · 2023-08-13T07:03:22Z

☀️ Test successful - checks-actions
Approved by: compiler-errors
Pushing 7455aa5 to master...

rust-timer · 2023-08-13T08:24:32Z

Finished benchmarking commit (7455aa5): comparison URL.

Overall result: ❌ regressions - no action needed

@rustbot label: -perf-regression

Instruction count

This is a highly reliable metric that was used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	0.4%	[0.4%, 0.4%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

This benchmark run did not return any relevant results for this metric.

Cycles

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	3.1%	[2.0%, 4.7%]	9
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 632.32s -> 633.837s (0.24%)

lcnr added the A-coherence Area: Coherence label Aug 4, 2023

rustbot assigned compiler-errors Aug 4, 2023

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. WG-trait-system-refactor The Rustc Trait System Refactor Initiative (-Znext-solver) labels Aug 4, 2023

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Rollup of 8 pull requests #114632

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lcnr force-pushed the trait_ref_is_knowable-normalize branch 3 times, most recently from bf154dc to d502fff Compare August 10, 2023 12:44

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lcnr added 2 commits August 12, 2023 20:37

normalize in trait_ref_is_knowable in new solver

9eeaf1f

lower evaluate_goal stability check to warn

5176288

lcnr force-pushed the trait_ref_is_knowable-normalize branch from d502fff to 5176288 Compare August 12, 2023 18:50

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Rollup of 5 pull requests #114765

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bors added the merged-by-bors This PR was explicitly merged by bors. label Aug 13, 2023

bors merged commit 7455aa5 into rust-lang:master Aug 13, 2023

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Rework negative coherence to properly consider impls that only partly overlap #112875

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lcnr deleted the trait_ref_is_knowable-normalize branch August 14, 2023 07:34

compiler-errors mentioned this pull request Aug 15, 2023

Tracking issue for -Znext-solver=coherence (next solver enablement in coherence) #114862

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normalize in `trait_ref_is_knowable` in new solver #114457

normalize in `trait_ref_is_knowable` in new solver #114457

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normalize in trait_ref_is_knowable in new solver #114457

normalize in trait_ref_is_knowable in new solver #114457

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Overall result: ❌ regressions - no action needed

Instruction count

Max RSS (memory usage)

Cycles

Binary size

normalize in `trait_ref_is_knowable` in new solver #114457

normalize in `trait_ref_is_knowable` in new solver #114457