fix: don't emit E0711 if staged_api not enabled

[Ezrashaw]

Fixes #106589

Simple fix, added UI test.

As an aside, it seems a lot of features are susceptible to this, E0711 stands out to me because it's perma-unstable and we are effectively exposing an implementation detail.

[rustbot]

r? @eholk

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

[Ezrashaw]

@Mark-Simulacrum I've applied your suggestion.

@rustbot ready

[Mark-Simulacrum]

@bors r+ rollup=never (perf)

[bors]

📌 Commit f4afc42a0661e23cfcf1483ba54bc8c63e000644 has been approved by Mark-Simulacrum

It is now in the queue for this repository.

[bors]

🔒 Merge conflict

This pull request and the master branch diverged in a way that cannot be automatically merged. Please rebase on top of the latest master branch, and let the reviewer approve again.

How do I rebase?

Assuming self is your fork and upstream is this repository, you can resolve the conflict following these steps:

1. git checkout no-e0711-without-staged-api (switch to your branch)
2. git fetch upstream master (retrieve the latest master)
3. git rebase upstream/master -p (rebase on top of it)
4. Follow the on-screen instruction to resolve conflicts (check git status if you got lost).
5. git push self no-e0711-without-staged-api --force-with-lease (update this PR)

You may also read Git Rebasing to Resolve Conflicts by Drew Blessing for a short tutorial.

Please avoid the "Resolve conflicts" button on GitHub. It uses git merge instead of git rebase which makes the PR commit history more difficult to read.

Sometimes step 4 will complete without asking for resolution. This is usually due to difference between how Cargo.lock conflict is handled during merge and rebase. This is normal, and you should still perform step 5 to update this PR.

Error message

CONFLICT (file location): src/test/ui/stability-attribute/issue-106589.stderr added in heads/homu-tmp inside a directory that was renamed in HEAD, suggesting it should perhaps be moved to tests/ui/stability-attribute/issue-106589.stderr.
CONFLICT (file location): src/test/ui/stability-attribute/issue-106589.rs added in heads/homu-tmp inside a directory that was renamed in HEAD, suggesting it should perhaps be moved to tests/ui/stability-attribute/issue-106589.rs.
warning: inexact rename detection was skipped due to too many files.
warning: you may want to set your merge.renamelimit variable to at least 27539 and retry the command.
Automatic merge failed; fix conflicts and then commit the result.

[Ezrashaw]

@Mark-Simulacrum Had to rebase because src/test/ was moved to tests/.

@rustbot ready

[jyn514]

@bors r=Mark-Simulacrum

[bors]

📌 Commit be1a6db has been approved by Mark-Simulacrum

It is now in the queue for this repository.

[bors]

⌛ Testing commit be1a6db with merge 159ba8a...

[bors]

☀️ Test successful - checks-actions
Approved by: Mark-Simulacrum
Pushing 159ba8a to master...

[rust-timer]

Finished benchmarking commit (159ba8a): 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)	-	-	0
Regressions ❌ (secondary)	4.4%	[4.4%, 4.4%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-5.9%	[-5.9%, -5.9%]	1
All ❌✅ (primary)	-	-	0

Cycles

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