[perf] Detect ?0: Tr<?0> conflict in deep reject

[compiler-errors]

No description provided.

[compiler-errors]

@bors2 try @rust-timer queue

[rust-bors]

⌛ Trying commit 40e9ee7 with merge 46b09f7…

To cancel the try build, run the command @bors2 try cancel.

[compiler-errors]

@bors2 try @rust-timer queue

[rust-bors]

⌛ Trying commit 130cafd with merge 72c9000…

(The previously running try build was automatically cancelled.)

To cancel the try build, run the command @bors2 try cancel.

[rust-bors]

☀️ Try build successful (CI)
Build commit: 72c9000 (72c90007d22872684573067006f978d19df0efcd, parent: 6dec76f1c2809fded082dd44d3752d3f6220d767)

[rust-timer]

Finished benchmarking commit (72c9000): comparison URL.

Overall result: ❌ regressions - please read the text below

Benchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf.

Next Steps: If you can justify the regressions found in this try perf run, please do so in sufficient writing along with @rustbot label: +perf-regression-triaged. If not, please fix the regressions and do another perf run. If its results are neutral or positive, the label will be automatically removed.

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

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	0.7%	[0.4%, 1.1%]	14
Regressions ❌ (secondary)	0.4%	[0.2%, 0.6%]	5
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.7%	[0.4%, 1.1%]	14

Max RSS (memory usage)

Results (primary -0.8%, secondary -1.8%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	1.3%	[1.3%, 1.3%]	1
Improvements ✅ (primary)	-0.8%	[-0.8%, -0.8%]	1
Improvements ✅ (secondary)	-4.8%	[-4.8%, -4.8%]	1
All ❌✅ (primary)	-0.8%	[-0.8%, -0.8%]	1

Cycles

Results (secondary 3.5%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	3.5%	[3.0%, 4.0%]	4
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

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

Bootstrap: 461.008s -> 458.705s (-0.50%)
Artifact size: 372.14 MiB -> 372.17 MiB (0.01%)