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 note: required because of the requirements on the impl of `IntoNullable` for `<Col as Expression>::SqlType`
8 --> $DIR/issue-38821.rs:9:18
10 LL | impl<T: NotNull> IntoNullable for T {
12 = note: this error originates in the derive macro `Copy` (in Nightly builds, run with -Z macro-backtrace for more info)
13 help: consider further restricting the associated type
15 LL | Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>, <Col as Expression>::SqlType: NotNull,
16 | +++++++++++++++++++++++++++++++++++++++
18 error: aborting due to previous error
20 For more information about this error, try `rustc --explain E0277`.