1 error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
2 --> $DIR/issue-38821.rs:23:17
4 LL | #[derive(Debug, Copy, Clone)]
5 | ^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
7 = help: consider adding a `where <Col as Expression>::SqlType: NotNull` bound
8 = note: required because of the requirements on the impl of `IntoNullable` for `<Col as Expression>::SqlType`
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0277`.