Skip to content

experiment: Support aliasing local crate root in extern prelude #55275

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom
Merged
merged 1 commit into from
Dec 1, 2018
Merged

experiment: Support aliasing local crate root in extern prelude #55275

merged 1 commit into from
Dec 1, 2018

Conversation

petrochenkov
Copy link
Contributor

@petrochenkov petrochenkov commented Oct 22, 2018 •
edited
Loading

This PR provides some minimally invasive solution for the 2018 edition migration issue described in #54647 and affecting proc macro crates.

extern crate NAME as RENAME; now accepts NAME=self and interprets it as referring to the local crate.
As with other extern crate items, RENAME in this case gets into extern prelude in accordance with #54658, thus resolving #54647.

extern crate self as serde; // Adds local crate to extern prelude as `serde`

This solution doesn't introduce any new syntax and has minimal maintenance cost, so it can be easily deprecated if something better is found in the future.

Closes #54647

@rust-highfive
Copy link
Contributor

r? @michaelwoerister

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

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 22, 2018
@petrochenkov
Copy link
Contributor Author

cc @rust-lang/lang

@petrochenkov petrochenkov added T-lang Relevant to the language team S-waiting-on-team Status: Awaiting decision from the relevant subteam (see the T-<team> label). F-rust_2018_preview `#![feature(rust_2018_preview)]` and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 22, 2018
@petrochenkov petrochenkov mentioned this pull request Oct 22, 2018
Closed
@Centril
Copy link
Contributor

Centril commented Oct 22, 2018

Seems fine by me (but I can't speak for everyone in the team).
The syntax=>semantics are fairly obvious and it seems like a nice reuse of the syntax that we have.

@michaelwoerister
Copy link
Member

r? @eddyb maybe? I know too little about name resolution.

@bors
Copy link
Collaborator

bors commented Oct 25, 2018

☔ The latest upstream changes (presumably #54658) made this pull request unmergeable. Please resolve the merge conflicts.

@bors
Copy link
Collaborator

bors commented Oct 28, 2018

☔ The latest upstream changes (presumably #54683) made this pull request unmergeable. Please resolve the merge conflicts.

@eddyb
Copy link
Member

eddyb commented Nov 3, 2018

Implementation LGTM.

@rfcbot fcp merge

@rfcbot
Copy link

rfcbot commented Nov 3, 2018 •
edited by scottmcm
Loading

Team member @eddyb has proposed to merge this. The next step is review by the rest of the tagged teams:

No concerns currently listed.

Once a majority of reviewers approve (and none object), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

See this document for info about what commands tagged team members can give me.

@rfcbot rfcbot added proposed-final-comment-period Proposed to merge/close by relevant subteam, see T-<team> label. Will enter FCP once signed off. disposition-merge This issue / PR is in PFCP or FCP with a disposition to merge it. labels Nov 3, 2018
@bors
Copy link
Collaborator

bors commented Nov 21, 2018

☔ The latest upstream changes (presumably #56032) made this pull request unmergeable. Please resolve the merge conflicts.

@nikomatsakis nikomatsakis added this to the Rust 2018 Release milestone Nov 21, 2018
@nikomatsakis
Copy link
Contributor

(Tagged @pnkfelix as they are on PTO)

@rfcbot rfcbot added final-comment-period In the final comment period and will be merged soon unless new substantive objections are raised. and removed proposed-final-comment-period Proposed to merge/close by relevant subteam, see T-<team> label. Will enter FCP once signed off. labels Nov 21, 2018
@rfcbot
Copy link

rfcbot commented Nov 21, 2018

🔔 This is now entering its final comment period, as per the review above. 🔔

@nikomatsakis nikomatsakis removed this from the Rust 2018 Release milestone Nov 21, 2018
@rfcbot
Copy link

rfcbot commented Dec 1, 2018

The final comment period, with a disposition to merge, as per the review above, is now complete.

@rfcbot rfcbot added finished-final-comment-period The final comment period is finished for this PR / Issue. and removed final-comment-period In the final comment period and will be merged soon unless new substantive objections are raised. labels Dec 1, 2018
@petrochenkov
Copy link
Contributor Author

@bors r=eddyb

@bors
Copy link
Collaborator

bors commented Dec 1, 2018

📌 Commit 549bd45 has been approved by eddyb

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-team Status: Awaiting decision from the relevant subteam (see the T-<team> label). labels Dec 1, 2018
@bors
Copy link
Collaborator

bors commented Dec 1, 2018

⌛ Testing commit 549bd45 with merge d311571...

bors added a commit that referenced this pull request Dec 1, 2018
@bors
Auto merge of #55275 - petrochenkov:extself, r=eddyb
d311571 
experiment: Support aliasing local crate root in extern prelude

This PR provides some minimally invasive solution for the 2018 edition migration issue described in #54647 and affecting proc macro crates.

`extern crate NAME as RENAME;` now accepts `NAME`=`self` and interprets it as referring to the local crate.
As with other `extern crate` items, `RENAME` in this case gets into extern prelude in accordance with #54658, thus resolving #54647.
```rust
extern crate self as serde; // Adds local crate to extern prelude as `serde`
```
This solution doesn't introduce any new syntax and has minimal maintenance cost, so it can be easily deprecated if something better is found in the future.

Closes #54647
@Centril
Copy link
Contributor

Centril commented Dec 1, 2018

@petrochenkov Hmm; If we are adding the unstable feature extern_crate_self, where's the tracking issue? =P (I thought we were doing it on 1.32...?)

@petrochenkov
Copy link
Contributor Author

petrochenkov commented Dec 1, 2018 •
edited
Loading

I'll add it today (maybe in this PR if checkin fails).

UPDATE: Done in #56412.

@petrochenkov petrochenkov mentioned this pull request Dec 1, 2018
Closed
@petrochenkov
Copy link
Contributor Author

Tracking issue: #56409.

@bors
Copy link
Collaborator

bors commented Dec 1, 2018

☀️ Test successful - status-appveyor, status-travis
Approved by: eddyb
Pushing d311571 to master...

@bors bors merged commit 549bd45 into rust-lang:master Dec 1, 2018
@bors bors mentioned this pull request Dec 1, 2018
Merged
This was referenced Jan 9, 2019
Closed
Merged
@freesig freesig mentioned this pull request May 22, 2019
Closed
dhardy added a commit to kas-gui/kas that referenced this pull request Oct 25, 2019
@dhardy
Use prefered solution for local crate references from procedural macros
5b7af83 
rust-lang/rust#55275
artob added a commit to asimov-platform/protoflow that referenced this pull request Jul 28, 2024
@artob
Alias the crate into the extern prelude.
e6afaa6 
See: rust-lang/rust#54647
See: rust-lang/rust#55275
artob added a commit to asimov-platform/protoflow that referenced this pull request Aug 19, 2024
@artob
Alias the crate into the extern prelude.
db8b43c 
See: rust-lang/rust#54647
See: rust-lang/rust#55275
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Reviewers
1 more reviewer

@eddyb eddyb eddyb approved these changes

Reviewers whose approvals may not affect merge requirements
Assignees

@eddyb eddyb

Labels
disposition-merge This issue / PR is in PFCP or FCP with a disposition to merge it. F-rust_2018_preview `#![feature(rust_2018_preview)]` finished-final-comment-period The final comment period is finished for this PR / Issue. S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. T-lang Relevant to the language team
Projects
None yet
Milestone
No milestone
Development

Successfully merging this pull request may close these issues.
8 participants
@petrochenkov @rust-highfive @Centril @michaelwoerister @bors @eddyb @rfcbot @nikomatsakis