Emit an error when return-type-notation is used with type/const params

[compiler-errors]

These are not intended to be supported initially, even though the compiler supports them internally...

[rustbot]

r? @lcnr

(rustbot has picked a reviewer for you, use r? to override)

[lcnr]

r? types

[bors]

☔ The latest upstream changes (presumably #111174) made this pull request unmergeable. Please resolve the merge conflicts.

[compiler-errors]

@jackh726 do you plan on reviewing this any time soon? otherwise, i'm gonna re-roll.

[bors]

☔ The latest upstream changes (presumably #111858) made this pull request unmergeable. Please resolve the merge conflicts.

[apiraino]

I'll do that (hoping it's fine)

r? types

[spastorino]

@compiler-errors feel free to r=me after resolving conflicts.

[compiler-errors]

astconv is apparently too big, so i deleted a method that wasn't really necessary in b0eaaca

[compiler-errors]

@bors r=spastorino

[bors]

📌 Commit b0eaaca has been approved by spastorino

It is now in the queue for this repository.

[bors]

⌛ Testing commit b0eaaca with merge e94bda3...

[bors]

☀️ Test successful - checks-actions
Approved by: spastorino
Pushing e94bda3 to master...

[rust-timer]

Finished benchmarking commit (e94bda3): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

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

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)	4.8%	[4.4%, 5.2%]	2
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-1.3%	[-1.3%, -1.3%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	2.8%	[-1.3%, 5.2%]	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)	-3.7%	[-3.7%, -3.7%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-3.7%	[-3.7%, -3.7%]	1

Binary size

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

Bootstrap: 647.017s -> 647.329s (0.05%)