New example of higher-ranked lifetime error

[nappa85]

As discussed in #92096, I've found another example of higher-ranked lifetime error

Long story short, I was developing a struct that contains a string key and a database connection. For other problems the connection was already owned, but the key was a Cow<'key, str> to avoid allocation when unneeded.
The constructor accepted S: Into<Cow<'key, str>>, so you can pass in even a static str or a String, no problems.

Everything was looking good, mi lib crates using that struct built fine, until I plugged it into my warp webserver, at this point I've got my higher-ranked lifetime error.
You can test yourself in this project where I've replicated the problem: https://github.com/nappa85/hrtb-error

To solve the problem, I've converted the Cow<'key, str> into a String and removed the lifetime from my struct.
To test the solution you simply have to change the pointed branch from "cow" to "owned" inside Cargo.toml

[eholk]

Discussed in wg-async triage meeting today.

Thanks for the helpful repo that demonstrates the issue! A good next step would be to see if we can reduce the issue even further.

[Enselic]

Triage: By my estimation, the reproducer is too complicated to be minimized by anyone other than the original author. Mainly because it involves two big dependencies:

logic-lock = { git = "https://github.com/nappa85/logic-lock.git", branch = "cow" }
sea-orm = { git = "https://github.com/nappa85/sea-orm.git", features = ["sqlx-mysql", "runtime-tokio-rustls"] }

I don't think it can be expected that someone has to audit that much code before being able to minimize. I also don't think it can be expected that someone else shall run code from strangers without first doing a code audit.

So, I will close this as "too big reproducer". I am of course happy to re-open if a small and safe reproducer is found!

[lqd]

We do such complicated minimizations all the time, it's fine. If it's not a duplicate nor is already fixed, it's likely a real issue that we want to track and hope to fix.