Suggest x build library for a custom toolchain that fails to load core

[mu001999]

Fixes #113222

The nicer suggestion for dev-channel won't be emitted if -Z ui-testing enabled. IMO, this is acceptable for now.

[rustbot]

r? @eholk

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[mu001999]

r? @Nilstrieb

[bors]

☔ The latest upstream changes (presumably #113288) made this pull request unmergeable. Please resolve the merge conflicts.

[Noratrieb]

I tested it locally with x test tests/ui and it passed.

[Noratrieb]

@bors r+

[bors]

📌 Commit 9b6bdcd has been approved by Nilstrieb

It is now in the queue for this repository.

[bors]

⌛ Testing commit 9b6bdcd with merge aa70e5f...

[bors]

☀️ Test successful - checks-actions
Approved by: Nilstrieb
Pushing aa70e5f to master...

[rust-timer]

Finished benchmarking commit (aa70e5f): comparison URL.

Overall result: ❌ regressions - 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.

	mean	range	count
Regressions ❌ (primary)	0.7%	[0.7%, 0.7%]	2
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.7%	[0.7%, 0.7%]	2

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)	2.0%	[1.9%, 2.0%]	2
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-1.3%	[-1.3%, -1.3%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.9%	[-1.3%, 2.0%]	3

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)	-4.9%	[-4.9%, -4.9%]	1
All ❌✅ (primary)	-	-	0

Binary size

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

Bootstrap: 648.105s -> 647.209s (-0.14%)