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Improve parse item fallback #125388

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@dev-ardi dev-ardi commented May 21, 2024 •
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Closes #92615 and closes #101622
Please review the new diagnostics cafefully.

This PR also adds a few more comments to the parser.

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rustbot commented May 21, 2024

r? @wesleywiser

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@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 May 21, 2024
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SparrowLii reviewed May 24, 2024
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I don't think this PR solves #101622 :(

compiler/rustc_parse/src/parser/item.rs Outdated
.dcx()
.struct_span_err(self.token.span, format!("expected item, found {token_str}"));

match self.parse_full_stmt(AttemptLocalParseRecovery::No) {
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@SparrowLii SparrowLii May 24, 2024 •
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We'd be better doing more analysis to figure out what went wrong here, rather than treating them all as statements. For example, whether it contains ; in [] can be used to distinguish whether it is an attribute or an array.

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I gave up on trying to detect kinds of expressions as it's very unreliable.

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SparrowLii
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I don't think this PR solves #101622 :(

It addresses the main point raised in the issue, right?

@dev-ardi dev-ardi force-pushed the improve-parse-item-fallback branch 3 times, most recently from 9a129e5 to 06a1ccf Compare May 31, 2024 15:29
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@rustbot ready
@SparrowLii I've addressed your concerns and reworked the approach a bit.

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bors commented Jun 18, 2024

☔ The latest upstream changes (presumably #126049) made this pull request unmergeable. Please resolve the merge conflicts.

@dev-ardi dev-ardi force-pushed the improve-parse-item-fallback branch from 06a1ccf to 1d326d5 Compare June 19, 2024 20:19
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dev-ardi commented Jun 20, 2024 •
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@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. 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. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jun 20, 2024
@dev-ardi dev-ardi force-pushed the improve-parse-item-fallback branch 2 times, most recently from 3f2ccd7 to b9ddf53 Compare June 20, 2024 22:31
@dev-ardi dev-ardi force-pushed the improve-parse-item-fallback branch from b9ddf53 to c66b446 Compare July 4, 2024 22:37
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bors commented Jul 18, 2024

☔ The latest upstream changes (presumably #127906) made this pull request unmergeable. Please resolve the merge conflicts.

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@dev-ardi
ping from triage - can you post your status on this PR? This PR has not received an update in a few months.

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dev-ardi commented Sep 3, 2024

It was left unreviewed for a while so it became full of conflicts. I intend to finish it at some point though...

@dev-ardi dev-ardi force-pushed the improve-parse-item-fallback branch 2 times, most recently from 57d1590 to faf1c5f Compare October 2, 2024 20:18
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dev-ardi commented Oct 2, 2024

@rustbot ready

@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 Oct 2, 2024
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Poor recovery from pub let x = ... Provide a better error when code is put outside of a function
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