1.100 beta rustdoc crater regression: "called Option::unwrap() on a None value" in librustdoc/clean/mod.rs #164158

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1. theemathas

   added

   T-rustdocRelevant to the rustdoc team, which will review and decide on the PR/issue.Relevant to the rustdoc team, which will review and decide on the PR/issue.

   I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

   regression-from-stable-to-betaPerformance or correctness regression from stable to beta.Performance or correctness regression from stable to beta.

   C-bugCategory: This is a bug.Category: This is a bug.

   E-needs-bisectionCall for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustcCall for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustc

   E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example

   on Oct 11, 2026
2. rustbot

   added

   needs-triageThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triagingThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triaging

   I-prioritizeIssue needs a team member to assess the impact. Will be replaced by P-{low,medium,high,critical}Issue needs a team member to assess the impact. Will be replaced by P-{low,medium,high,critical}

   on Oct 11, 2026
3. theemathas

   added a parent issue on Oct 11, 2026

   • Crater runs for 1.100 #163482
4. mejrs commented on Oct 11, 2026

   

   mejrs

   on Oct 11, 2026

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   rust/src/librustdoc/clean/mod.rs

   Line 3222 in e3feeb5

   if segments.last().unwrap().ident.name == kw::SelfLower {

   Added in #161349
5. theemathas commented on Oct 11, 2026

   

   theemathas

   on Oct 11, 2026

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   cc @oli-obk (author), @petrochenkov (reviewer)
6. theemathas

   added

   T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

   and removed

   E-needs-bisectionCall for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustcCall for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustc

   on Oct 11, 2026
7. mejrs commented on Oct 11, 2026

   

   mejrs

   on Oct 11, 2026

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   I can't reproduce it but the use {*}; looks very suspicious https://crates.io/crates/lunarity-ast/0.2.0/code/src/source.rs#L1
8. theemathas commented on Oct 11, 2026

   

   theemathas

   on Oct 11, 2026

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   what the fuck?
9. 13 remaining items

   Load more
10. theemathas

    removed

    T-langRelevant to the language teamRelevant to the language team

    I-lang-nominatedNominated for discussion during a lang team meeting.Nominated for discussion during a lang team meeting.

    on Oct 11, 2026
11. mejrs commented on Oct 11, 2026

    

    mejrs

    on Oct 11, 2026

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    Minimized:

    use {{}};
12. mejrs

    removed

    E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example

    on Oct 11, 2026
13. theemathas commented on Oct 11, 2026

    

    theemathas

    on Oct 11, 2026

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    @mejrs Do these two minimizations represent all 4 crates found by crater?
14. mejrs commented on Oct 11, 2026

    

    mejrs

    on Oct 11, 2026

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    looks that way

    these all have smth like

    use {
        import, other_import,
        {
            more_import,
        }
    };

    https://github.com/Flemming-DC/Sapi-Rust-2/blob/94ea651c3404ae43875886af0012400932872c6c/src/vendor/bumpalo/boxed.rs#L122-L124

    https://github.com/ungtb10d/just/blob/7680b1997973de2c8d5ea1072507cf191e698c04/src/lib.rs#L57

    https://crates.io/crates/httpflv/0.4.5/code/src/define.rs#L3
15. sreekaransrinath commented on Oct 25, 2026

    

    sreekaransrinath

    on Oct 25, 2026

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    @rustbot claim
16. rustbot

    assigned

    sreekaransrinath

    on Oct 25, 2026
17. JonathanBrouwer

    added 3 commits that reference this issue on Oct 25, 2026

    Rollup merge of rust-lang#164883 - sreekaransrinath:rustdoc-empty-nes…

    ...

    This issue will close once commit a45fce6 is merged into the 'main' branch.

    a45fce6

    Rollup merge of rust-lang#164883 - sreekaransrinath:rustdoc-empty-nes…

    ...

    This issue will close once commit 806d373 is merged into the 'main' branch.

    806d373

    Rollup merge of rust-lang#164883 - sreekaransrinath:rustdoc-empty-nes…

    ...

    This issue will close once commit 0fa6184 is merged into the 'main' branch.

    0fa6184
18. rust-bors

    closed this as completedin #164883on Oct 26, 2026
19. rust-bors

    added a commit that references this issue on Oct 26, 2026

    Unrolled build for #164883 in rollup 164928

    ...

    This issue will close once commit b577c59 is merged into the 'main' branch.

    b577c59
20. apiraino

    removed

    I-prioritizeIssue needs a team member to assess the impact. Will be replaced by P-{low,medium,high,critical}Issue needs a team member to assess the impact. Will be replaced by P-{low,medium,high,critical}

    on Oct 26, 2026
21. moabo3li

    added a commit that references this issue on Oct 26, 2026

    Rollup merge of #164883 - sreekaransrinath:rustdoc-empty-nested-use, …

    ...

    This issue will close once commit c308255 is merged into the 'master' branch.

    c308255