the trait bound `<expression::count::CountStar as expression::Expression>::SqlType: sql_types::ops::Add` is not satisfied

[llxxbb]

• Rust: 1.28-nightly
• Diesel: 1.3.0
• Database: sqlite
• Operating System win 10

diesel = { version = "1.3", default-features = false, features = ["sqlite","chrono"] }

error[E0277]: the trait bound <expression::count::CountStar as expression::Expression>::SqlType: sql_types::ops::Add is not satisfied
--> C:\Users\llxxb.cargo\registry\src\github.com-1ecc6299db9ec823\diesel-1.3.0\src\expression\count.rs:58:39
|
58 | #[derive(Debug, Clone, Copy, QueryId, DieselNumericOps)]
| ^^^^^^^^^^^^^^^^ the trait sql_types::ops::Add is not implemented for <expression::count::CountStar as expression::Expression>::SqlType
|
= help: consider adding a where <expression::count::CountStar as expression::Expression>::SqlType: sql_types::ops::Add bound
= help: see issue #48214
= help: add #![feature(trivial_bounds)] to the crate attributes to enable

[weiznich]

It's a rustc bug, see #1700 #1701 #1705 #1711 #1729, #1730 , rust-lang/rust#50825 and rust-lang/rust#51042

[BartMassey]

Looks like a change to rustc was pushed about 4 hours ago that is reported to resolve this issue. This would be a good time to close it, if it hadn't been closed 14 days ago. :-) rust-lang/rust/pull/#51042

[Eijebong]

It's not merged yet ;)

[BartMassey]

Indeed. So maybe we should wait to have closed the issue a little longer. :-)

[Eijebong]

No because it's not something that's actionable on our part so it shouldn't even have been opened here in the first place ;)