Remove u32 on BrAnon and BoundTyKind::Anon in favor of BoundVar on Placeholder types

[jackh726]

r? @nnethercote

Better alternative to #110025

[rustbot]

Some changes occurred to the core trait solver

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

[jackh726]

@bors try @rust-timer queue

[bors]

⌛ Trying commit b15195a with merge 556dcffdd3e6e31e4521e798443b02e2f28745f6...

[bors]

☀️ Try build successful - checks-actions
Build commit: 556dcffdd3e6e31e4521e798443b02e2f28745f6 (556dcffdd3e6e31e4521e798443b02e2f28745f6)

[rust-timer]

Finished benchmarking commit (556dcffdd3e6e31e4521e798443b02e2f28745f6): comparison URL.

Overall result: no relevant changes - no action needed

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR may lead to changes in compiler perf.

@bors rollup=never
@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

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

Max RSS (memory usage)

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)	2.4%	[1.7%, 3.1%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-4.4%	[-5.1%, -3.7%]	2
All ❌✅ (primary)	-	-	0

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)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.6%	[-2.9%, -2.3%]	3
All ❌✅ (primary)	-	-	0

[nnethercote]

Thanks! I would still like the new size assertion from the first commit in #110025. (I think this change reduces the size of RegionKind from 32 bytes to 28 bytes on x86-64, but it's hard to know for sure.) You could add it here, or you could just merge this and then I can adjust #110025 and do it as a follow-up. I'll let you decide.

@bors delegate=jackh726

[bors]

✌️ @jackh726 can now approve this pull request

[jackh726]

I've cherry-picked your commit from #110025. Indeed the size is reduced from 32 to 28.

@bors r=nnethercote

[bors]

📌 Commit f08f154 has been approved by nnethercote

It is now in the queue for this repository.

[bors]

⌛ Testing commit f08f154 with merge 9452402...

[bors]

☀️ Test successful - checks-actions
Approved by: nnethercote
Pushing 9452402 to master...

[rust-timer]

Finished benchmarking commit (9452402): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

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

Max RSS (memory usage)

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)	2.2%	[1.7%, 2.7%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-4.1%	[-5.1%, -3.1%]	2
All ❌✅ (primary)	-	-	0

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)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.2%	[-3.4%, -3.1%]	2
All ❌✅ (primary)	-	-	0