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1.96 beta rustdoc regression: "... is a virtual manifest, but this command requires running against an actual package in this workspace" #155992

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@theemathas

Regression found by the 1.96 beta rustdoc crater run.

[INFO] [stderr] error: manifest path `/opt/rustwide/workdir/Cargo.toml` is a virtual manifest, but this command requires running against an actual package in this workspace

https://crater-reports.s3.amazonaws.com/beta-1.96-rustdoc-2/beta-2026-04-21/gh/catuhana.dirpc/log.txt

For comparison, here's the logs for the run using the 1.95 stable compiler: https://crater-reports.s3.amazonaws.com/beta-1.96-rustdoc-2/1.95.0/gh/catuhana.dirpc/log.txt

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    C-bugCategory: This is a bug.I-prioritizeIssue: Indicates that prioritization has been requested for this issue.T-cargoRelevant to the cargo team, which will review and decide on the PR/issue.T-infraRelevant to the infrastructure team, which will review and decide on the PR/issue.T-rustdocRelevant to the rustdoc team, which will review and decide on the PR/issue.needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.

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