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+error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
+ --> $DIR/issue-38821.rs:23:17
+ |
+LL | #[derive(Debug, Copy, Clone)]
+ | ^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
+ |
+note: required because of the requirements on the impl of `IntoNullable` for `<Col as Expression>::SqlType`
+ --> $DIR/issue-38821.rs:9:18
+ |
+LL | impl<T: NotNull> IntoNullable for T {
+ | ^^^^^^^^^^^^ ^
+ = note: this error originates in the derive macro `Copy` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider further restricting the associated type
+ |
+LL | Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>, <Col as Expression>::SqlType: NotNull,
+ | +++++++++++++++++++++++++++++++++++++++
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.