Avoid unnecessary new_adt/new_fn_def calls.

[nnethercote]

They can be skipped if there are no arguments, avoiding the "relate" operation work and also the subsequent interning.

r? @ghost

[nnethercote]

@bors try @rust-timer queue

[rust-bors]

⌛ Trying commit 9d57f5e with merge 848ae35…

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

[Kobzol]

Seems like a webhook was lost :/ We'll have to implement some recovery from this in new bors.

@bors try

[rust-bors]

⌛ Trying commit 9d57f5e with merge 1090b05…

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

[rust-bors]

☀️ Try build successful (CI)
Build commit: 1090b05 (1090b05581acd12229e72c0ffcc8eca4a0d6a7f3, parent: b56aaec52bc0fa35591a872fb4aac81f606e265c)

[rust-timer]

Finished benchmarking commit (1090b05): comparison URL.

Overall result: ✅ improvements - no action needed

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.

@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
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-0.3%	[-0.5%, -0.1%]	61
Improvements ✅ (secondary)	-0.6%	[-1.6%, -0.1%]	53
All ❌✅ (primary)	-0.3%	[-0.5%, -0.1%]	61

Max RSS (memory usage)

Results (primary -0.5%, secondary -3.2%)

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

	mean	range	count
Regressions ❌ (primary)	1.0%	[1.0%, 1.0%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-2.1%	[-2.1%, -2.1%]	1
Improvements ✅ (secondary)	-3.2%	[-4.5%, -1.9%]	2
All ❌✅ (primary)	-0.5%	[-2.1%, 1.0%]	2

Cycles

Results (secondary -0.7%)

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)	3.9%	[3.9%, 3.9%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.2%	[-2.8%, -1.2%]	3
All ❌✅ (primary)	-	-	0

Binary size

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

Bootstrap: 469.891s -> 468.901s (-0.21%)
Artifact size: 374.63 MiB -> 374.64 MiB (0.00%)

[compiler-errors]

r=me if you want to take this out of draft.

[nnethercote]

@bors r=compiler-errors

[bors]

📌 Commit 9d57f5e has been approved by compiler-errors

It is now in the queue for this repository.