Type inference issue in Diesel

[AJTJ]

Type inference is not happening correctly, all the time, when using Diesel.

for example, with:

use trading_bot::schema::users::dsl::*;
let x = users.select(OutUser::as_select()).load(&mut conn);

for this, x is clearly of type Result<Vec<OutUser>, Error>, but rust-analyzer is identifying it as "unknown".

I have a feeling that rust-analyzer is probably struggling with how the generics are being created in diesel.

I really like rust-analyzer as a project. Is there something I can help with?

rust-analyzer version: 0.4.1438-standalone (924d277 2023-03-15)
rustc 1.69.0-nightly (31f858d9a 2023-02-28)

[Veykril]

Assuming its possible with your project but can you check whether using the master branch of diesel fixes this issue for you? I believe this is due to their proc-macros using an old edition which r-a struggles with.

[weiznich]

Yes this specific case should be worked around by diesel-rs/diesel#3564

[weiznich]

This is not fixed as shown by #14607

[lowr]

Let's close this one in favor of #14607. Thanks for the initial report!