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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)

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.