Use head span for rustc_on_unimplemented's enclosing_scope attr

[compiler-errors]

This may make #101281 slightly easier to understand

[rust-highfive]

r? @oli-obk

(rust-highfive has picked a reviewer for you, use r? to override)

[compiler-errors]

I am also happy to rename enclosing_scope now that it's really not "enclosing" -- it's more like parent_label now.

[cjgillot]

Suggested change

	tcx.hir().span(tcx.hir().local_def_id_to_hir_id(body));
	tcx.def_span(body);

[oli-obk]

r=me with def span used and the proposed variable rename applied

[oli-obk]

@bors r+

[bors]

📌 Commit edba0c9 has been approved by oli-obk

It is now in the queue for this repository.

[bors]

⌛ Testing commit edba0c9 with merge a2cdcb3...

[bors]

☀️ Test successful - checks-actions
Approved by: oli-obk
Pushing a2cdcb3 to master...

[rust-timer]

Finished benchmarking commit (a2cdcb3): comparison URL.

Overall result: ✅ improvements - 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.

	mean1	range	count2
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.7%	[-0.8%, -0.6%]	5
All ❌✅ (primary)	-	-	0

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.

	mean1	range	count2
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	2.2%	[2.2%, 2.2%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.0%	[-2.0%, -2.0%]	1
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.

	mean1	range	count2
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-2.6%	[-2.6%, -2.6%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-2.6%	[-2.6%, -2.6%]	1

Footnotes

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

2. number of relevant changes ↩ ↩² ↩³