Skip to content
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

Tracking issue for macros_in_extern feature #49476

Closed
abonander opened this issue Mar 29, 2018 · 3 comments · Fixed by #63931
Closed

Tracking issue for macros_in_extern feature #49476

abonander opened this issue Mar 29, 2018 · 3 comments · Fixed by #63931
Labels
C-tracking-issue Category: A tracking issue for an RFC or an unstable feature.

Comments

@abonander
Copy link
Contributor

abonander commented Mar 29, 2018 •
edited
Loading

This is a tracking issue for the macros_in_extern. This feature flag enables the usage of macro invocations in extern {} blocks:

macro_rules! emit_foreign_item(
    () => (fn read(fd: int, buf: *mut u8, size: usize) -> int;)
);

extern {
    emit_foreign_item!();
}

Declarative maco, proc-macro and proc-macro-attribute invocations are allowed as well. Macro defintions, however, are not.

This feature is unstable because it was recently implemented in #49350 without an RFC. It is considered a discrepancy in macro support and not a new feature. It should be completely backwards-compatible.
@abonander
Copy link
Contributor Author

cc @petrochenkov, @nrc, @jseyfried

@abonander abonander mentioned this issue Apr 2, 2018
Merged
@dtolnay dtolnay mentioned this issue Apr 4, 2018
Closed
@abonander
Copy link
Contributor Author

@petrochenkov I should get started on an Unstable Book entry for this feature, shouldn't I

alexcrichton added a commit to alexcrichton/rust that referenced this issue Apr 5, 2018
@alexcrichton
Rollup merge of rust-lang#49350 - abonander:macros-in-extern, r=petro…
46492ff 
…chenkov

Expand macros in `extern {}` blocks

This permits macro and proc-macro and attribute invocations (the latter only with the `proc_macro` feature of course) in `extern {}` blocks, gated behind a new `macros_in_extern` feature.

A tracking issue is now open at rust-lang#49476

closes rust-lang#48747
@pietroalbini pietroalbini added the C-tracking-issue Category: A tracking issue for an RFC or an unstable feature. label Apr 6, 2018
@dtolnay dtolnay mentioned this issue Sep 2, 2018
Closed
@dtolnay
Copy link
Member

dtolnay commented Oct 1, 2018

This leak / infinite alloc on invalid syntax needs to be fixed before stabilization: #54441.

@marmeladema marmeladema mentioned this issue Mar 29, 2019
Merged
@petrochenkov petrochenkov mentioned this issue Aug 29, 2019
Merged
Centril added a commit to Centril/rust that referenced this issue Oct 1, 2019
@Centril
Rollup merge of rust-lang#63931 - petrochenkov:stabmac, r=Centril
8bae91d 
Stabilize macros in some more positions

- Fn-like macros and attribute macros in `extern` blocks
- Fn-like procedural macros in type positions
- ~Attribute macros on inline modules~ (moved to rust-lang#64273)

Stabilization report: rust-lang#63931 (comment).

Closes rust-lang#49476
cc rust-lang#54727
@bors bors closed this as completed in 3bd34e0 Oct 1, 2019
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees
No one assigned
Labels
C-tracking-issue Category: A tracking issue for an RFC or an unstable feature.
Projects
None yet
Milestone
No milestone
Development

Successfully merging a pull request may close this issue.

Stabilize macros in some more positions petrochenkov/rust
3 participants
@dtolnay @pietroalbini @abonander