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merged 1 commit into from
Jul 18, 2024
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[macro_metavar_expr_concat] Add support for literals #127542

merged 1 commit into from
Jul 18, 2024

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c410-f3r
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@c410-f3r c410-f3r commented Jul 10, 2024 •
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Adds support for literals in macro parameters.

macro_rules! with_literal {
    ($literal:literal) => {
        const ${concat(FOO, $literal)}: i32 = 1;
    }
}

fn main() {
    with_literal!("_BAR");
    assert_eq!(FOO_BAR, 1);
}

cc #124225

r? @petrochenkov

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jul 10, 2024
tgross35
tgross35 reviewed Jul 10, 2024
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tests/ui/macros/macro-metavar-expr-concat/syntax-errors.stderr Outdated
Comment on lines 145 to 154
error: `${concat(..)}` is not generating a valid identifier
--> $DIR/syntax-errors.rs:103:16
|
LL | const ${concat(_foo, $literal)}: () = ();
| ^^^^^^^^^^^^^^^^^^^^^^^^
...
LL | bad_literal_parameter!("\x41");
| ------------------------------ in this macro invocation
|
= note: this error originates in the macro `bad_literal_parameter` (in Nightly builds, run with -Z macro-backtrace for more info)
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I think these error messages would be improved if they print the created identifier as a note. E.g. "_foo🤷 is not a valid identifier" can help narrow down what exactly is wrong when the exact combination isn't as obvious.

Doesn't have to be a part of this PR though.

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FYI you might need to wait a bit for a review, I think petrochenkov is currently out on vacation. (Somebody else might be able to pick it up but petrochenkov seems to be the expert in macro expansion).

petrochenkov
petrochenkov reviewed Jul 16, 2024
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@petrochenkov petrochenkov added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 16, 2024
@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jul 17, 2024
petrochenkov
petrochenkov reviewed Jul 17, 2024
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Addressing #127542 (comment) would also be good.
@rustbot author

@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 17, 2024
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Addressing #127542 (comment) would also be good. @rustbot author

Looks like a good candidate for a following PR.

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@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jul 17, 2024
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@bors r+

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bors commented Jul 17, 2024

📌 Commit 553279b has been approved by petrochenkov

It is now in the queue for this repository.

@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-review Status: Awaiting review from the assignee but also interested parties. labels Jul 17, 2024
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Спасибо!

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Jul 17, 2024
@matthiaskrgr
Rollup merge of rust-lang#127542 - c410-f3r:concat-again, r=petrochenkov
2b60845 
[`macro_metavar_expr_concat`] Add support for literals

Adds support for literals in macro parameters.

```rust
macro_rules! with_literal {
    ($literal:literal) => {
        const ${concat(FOO, $literal)}: i32 = 1;
    }
}

fn main() {
    with_literal!("_BAR");
    assert_eq!(FOO_BAR, 1);
}
```

cc rust-lang#124225

r? `@petrochenkov`
@matthiaskrgr matthiaskrgr mentioned this pull request Jul 17, 2024
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bors added a commit to rust-lang-ci/rust that referenced this pull request Jul 18, 2024
@bors
Auto merge of rust-lang#127876 - matthiaskrgr:rollup-aczhyuj, r=matth…
3610b45 
…iaskrgr

Rollup of 9 pull requests

Successful merges:

 - rust-lang#127542 ([`macro_metavar_expr_concat`] Add support for literals)
 - rust-lang#127652 (Unignore cg_gcc fmt)
 - rust-lang#127664 (Fix precise capturing suggestion for hidden regions when we have APITs)
 - rust-lang#127806 (Some parser improvements)
 - rust-lang#127828 (Commonize `uname -m` results for `aarch64` in docker runner)
 - rust-lang#127845 (unix: break `stack_overflow::install_main_guard` into smaller fn)
 - rust-lang#127854 (Add internal lint for detecting non-glob imports of `rustc_type_ir::inherent`)
 - rust-lang#127861 (Document the column numbers for the dbg! macro)
 - rust-lang#127875 (style-guide: Clarify version-sorting)

r? `@ghost`
`@rustbot` modify labels: rollup
@tgross35 tgross35 mentioned this pull request Jul 18, 2024
Merged
bors added a commit to rust-lang-ci/rust that referenced this pull request Jul 18, 2024
@bors
Auto merge of rust-lang#127892 - tgross35:rollup-7j9wkzc, r=tgross35
4bb2f27 
Rollup of 9 pull requests

Successful merges:

 - rust-lang#127542 ([`macro_metavar_expr_concat`] Add support for literals)
 - rust-lang#127652 (Unignore cg_gcc fmt)
 - rust-lang#127664 (Fix precise capturing suggestion for hidden regions when we have APITs)
 - rust-lang#127806 (Some parser improvements)
 - rust-lang#127828 (Commonize `uname -m` results for `aarch64` in docker runner)
 - rust-lang#127845 (unix: break `stack_overflow::install_main_guard` into smaller fn)
 - rust-lang#127859 (ptr::metadata: avoid references to extern types)
 - rust-lang#127861 (Document the column numbers for the dbg! macro)
 - rust-lang#127875 (style-guide: Clarify version-sorting)

r? `@ghost`
`@rustbot` modify labels: rollup
@tgross35 tgross35 mentioned this pull request Jul 18, 2024
Open
9 tasks
@bors bors merged commit e6f0caf into rust-lang:master Jul 18, 2024
6 checks passed
@rustbot rustbot added this to the 1.81.0 milestone Jul 18, 2024
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Jul 18, 2024
@rust-timer
Unrolled build for rust-lang#127542
1bb01e5 
Rollup merge of rust-lang#127542 - c410-f3r:concat-again, r=petrochenkov

[`macro_metavar_expr_concat`] Add support for literals

Adds support for literals in macro parameters.

```rust
macro_rules! with_literal {
    ($literal:literal) => {
        const ${concat(FOO, $literal)}: i32 = 1;
    }
}

fn main() {
    with_literal!("_BAR");
    assert_eq!(FOO_BAR, 1);
}
```

cc rust-lang#124225

r? ``@petrochenkov``
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