Emit only one nbsp error per file

[dtolnay]

Fixes #106101.

See #106098 for an explanation of how someone would end up with a large number of these nbsp characters in their source code, which is why I think rustc needs to handle this specific case in a friendlier way.

[rustbot]

r? @wesleywiser

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[fee1-dead]

@bors r+

[bors]

📌 Commit dab06cc has been approved by fee1-dead

It is now in the queue for this repository.

[bors]

⌛ Testing commit dab06cc with merge a5bfc25...

[bors]

☀️ Test successful - checks-actions
Approved by: fee1-dead
Pushing a5bfc25 to master...

[rust-timer]

Finished benchmarking commit (a5bfc25): 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.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-0.7%	[-0.8%, -0.7%]	4
Improvements ✅ (secondary)	-0.6%	[-1.1%, -0.3%]	15
All ❌✅ (primary)	-0.7%	[-0.8%, -0.7%]	4

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)	3.1%	[2.9%, 3.3%]	2
Regressions ❌ (secondary)	2.1%	[1.5%, 2.7%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	3.1%	[2.9%, 3.3%]	2

Cycles

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