Add regression test for missing size bound suggestion for trait item

[KevinA-cpu]

closes #85643

[rustbot]

Failed to set assignee to davidtwco: req=https://api.github.com/repos/rust-lang/rust/issues/161249/assignees (x-github-request-id: 8856:74108:321ABA:335E5B:6A834018): {"message": "No server is currently available to service your request. Sorry about that. Please try resubmitting your request and contact us if the problem persists."}

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[rustbot]

Thanks for the pull request, and welcome! The Rust Project is excited to review your changes, and you should hear from @davidtwco (or someone else) some time within the next two weeks.

Please see the contribution instructions for more information. Namely, in order to ensure the minimum review times lag, PR authors and assigned reviewers should ensure that the review label (S-waiting-on-review and S-waiting-on-author) stays updated, invoking these commands when appropriate:

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[KevinA-cpu]

r? diagnostics

[rustbot]

Failed to set assignee to fee1-dead: req=https://api.github.com/repos/rust-lang/rust/issues/161249/assignees (x-github-request-id: 6F1B:30F069:F4A79:10BD40:6A8341A5): {"message": "No server is currently available to service your request. Sorry about that. Please try resubmitting your request and contact us if the problem persists."}

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[estebank]

@bors r+

[rust-bors]

📌 Commit 87fd659 has been approved by estebank

It is now in the queue for this repository.