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Fix incorrect gating of nonterminals in key-value attributes #85445

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Fix incorrect gating of nonterminals in key-value attributes #85445

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Aaron1011
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Fixes #85432

When processing a #[derive] or #[cfg_eval] attribute, we need to
re-parse our attribute target, which requires flattenting all
Nonterminals. However, this caused us to incorrectly gate on a
(flattented) nonterminal in a key-value attribute, which is supposed to
be allowed.

Since we already perform this gating during the initial parse, we
suppress it in capture_cfg mode.

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r? @davidtwco

(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 May 18, 2021
@Aaron1011 Aaron1011 mentioned this pull request May 18, 2021
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@hellow554
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hellow554 commented May 18, 2021 •
edited

Is there a specific reason that there is no test for this? I've shown two examples [1] [2]

@Aaron1011
Fix incorrect gating of nonterminals in key-value attributes
fd1e19e 
Fixes rust-lang#85432

When processing a `#[derive]` or `#[cfg_eval]` attribute, we need to
re-parse our attribute target, which requires flattenting all
`Nonterminals`. However, this caused us to incorrectly gate on a
(flattented) nonterminal in a key-value attribute, which is supposed to
be allowed.

Since we already perform this gating during the initial parse, we
suppress it in `capture_cfg` mode.
@Aaron1011
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@hellow554 - I added a test locally, but forgot to git add it. Fixed.

@jyn514
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jyn514 commented May 18, 2021

@Aaron1011 this should already be fixed by #83366, which is waiting on bors.

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jyn514 commented May 18, 2021

Oh, I guess this is still useful for backporting to beta since #82608 landed in 1.53.0. Or another alternative is to revert #82608 in beta, not sure how hard/useful that is.

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@jyn514: Backporting this PR would be much simpler, since it's a one-line diff.

@jyn514 jyn514 added beta-nominated Nominated for backporting to the compiler in the beta channel. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels May 18, 2021
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nevertheless, the test should be included in either PR, probably in this one, because the other one is already approved to bors

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bors commented May 19, 2021

☔ The latest upstream changes (presumably #85458) made this pull request unmergeable. Please resolve the merge conflicts.

davidtwco
davidtwco approved these changes May 19, 2021
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Looks good to me, is my understanding correct that we don't want to r+ this, only backport?

@Aaron1011
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@davidtwco: That's right - now that gating has been removed entirely (since extended_key_value_attributes was stabilized), this is only needed on beta.

@Aaron1011 Aaron1011 closed this May 19, 2021
@Aaron1011 Aaron1011 reopened this May 20, 2021
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Beta backport accepted as per compiler team on Zulip

@rustbot label +beta-accepted

@rustbot rustbot added the beta-accepted Accepted for backporting to the compiler in the beta channel. label May 20, 2021
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jyn514 commented May 21, 2021

@Aaron1011 make you you update this to point to beta, right now the target branch is master

@Aaron1011 Aaron1011 changed the base branch from master to beta May 21, 2021 02:11
@Aaron1011 Aaron1011 changed the base branch from beta to master May 21, 2021 02:11
@crlf0710 crlf0710 added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jun 11, 2021
@Mark-Simulacrum Mark-Simulacrum removed the beta-nominated Nominated for backporting to the compiler in the beta channel. label Jun 11, 2021
@Mark-Simulacrum Mark-Simulacrum added this to the 1.53.0 milestone Jun 11, 2021
@Mark-Simulacrum Mark-Simulacrum mentioned this pull request Jun 11, 2021
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bors added a commit to rust-lang-ci/rust that referenced this pull request Jun 11, 2021
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Auto merge of rust-lang#86225 - Mark-Simulacrum:beta-next, r=Mark-Sim…
0a0f816 
…ulacrum

[beta] backports

* Disable the machine outliner by default rust-lang#86020
* Fix incorrect gating of nonterminals in key-value attributes rust-lang#85445
* Build crtbegin.o/crtend.o from source code rust-lang#85395
* Bring back x86_64-sun-solaris target to rustup rust-lang#85252
* Preserve SyntaxContext for invalid/dummy spans in crate metadata rust-lang#85211
* [beta] backport: Remove unsound TrustedRandomAccess implementations rust-lang#86222

r? `@Mark-Simulacrum`
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So, should this be closed?

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jyn514 commented Jun 14, 2021

Yes.

@jyn514 jyn514 closed this Jun 14, 2021
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Nightly rejects some macro-generated doc attribute values accepted by stable