Make empty bounds lower to WellFormed and make WellFormed coinductive

[jackh726]

r? rust-lang/types

[jackh726]

@bors try @rust-timer queue

[rust-timer]

Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

[bors]

⌛ Trying commit 17fc375eb17df1e939ac23d2297f0642e1cfa6dd with merge c078f423e8387b6d48de9e764d99dfefb7a083e4...

[bors]

☀️ Try build successful - checks-actions
Build commit: c078f423e8387b6d48de9e764d99dfefb7a083e4 (c078f423e8387b6d48de9e764d99dfefb7a083e4)

[rust-timer]

Queued c078f423e8387b6d48de9e764d99dfefb7a083e4 with parent 7125846, future comparison URL.

[rust-timer]

Finished benchmarking commit (c078f423e8387b6d48de9e764d99dfefb7a083e4): comparison url.

Instruction count

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

Max RSS (memory usage)

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

Cycles

Results

• Primary benchmarks: mixed results
• Secondary benchmarks: no relevant changes found

	mean1	max	count2
Regressions 😿 (primary)	2.6%	2.6%	1
Regressions 😿 (secondary)	N/A	N/A	0
Improvements 🎉 (primary)	-3.7%	-4.0%	2
Improvements 🎉 (secondary)	N/A	N/A	0
All 😿🎉 (primary)	-1.6%	-4.0%	3

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

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-review -S-waiting-on-perf -perf-regression

Footnotes

1. the arithmetic mean of the percent change ↩

2. number of relevant changes ↩

[oli-obk]

Maybe run perf on that first so we can replace the very likely with been shown

[jackh726]

Ehh, I would prefer to not try to make that change right now (because it's going to take some time to do right - which is limited for me right now - and I think the time will just be wasted).

[oli-obk]

@bors r+

[bors]

📌 Commit bd298ad has been approved by oli-obk

[bors]

⌛ Testing commit bd298ad with merge 116edb6...

[bors]

☀️ Test successful - checks-actions
Approved by: oli-obk
Pushing 116edb6 to master...

[rust-timer]

Finished benchmarking commit (116edb6): comparison url.

Instruction count

• Primary benchmarks: no relevant changes found
• Secondary benchmarks: 🎉 relevant improvements found

	mean1	max	count2
Regressions 😿 (primary)	N/A	N/A	0
Regressions 😿 (secondary)	N/A	N/A	0
Improvements 🎉 (primary)	N/A	N/A	0
Improvements 🎉 (secondary)	-0.6%	-0.7%	6
All 😿🎉 (primary)	N/A	N/A	0

Max RSS (memory usage)

Results

• Primary benchmarks: mixed results
• Secondary benchmarks: mixed results

	mean1	max	count2
Regressions 😿 (primary)	5.1%	5.1%	1
Regressions 😿 (secondary)	2.5%	3.8%	2
Improvements 🎉 (primary)	-2.0%	-2.0%	1
Improvements 🎉 (secondary)	-3.6%	-3.6%	1
All 😿🎉 (primary)	1.5%	5.1%	2

Cycles

Results

• Primary benchmarks: 🎉 relevant improvement found
• Secondary benchmarks: 😿 relevant regression found

	mean1	max	count2
Regressions 😿 (primary)	N/A	N/A	0
Regressions 😿 (secondary)	2.3%	2.3%	1
Improvements 🎉 (primary)	-3.3%	-3.3%	1
Improvements 🎉 (secondary)	N/A	N/A	0
All 😿🎉 (primary)	-3.3%	-3.3%	1

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

@rustbot label: -perf-regression

Footnotes

1. the arithmetic mean of the percent change ↩ ↩² ↩³

2. number of relevant changes ↩ ↩² ↩³