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pub struct Nullable<T: NotNull>(T);
pub trait NotNull {}
pub trait IntoNullable {
type Nullable;
}
impl<T: NotNull> IntoNullable for T {
type Nullable = Nullable<T>;
}
impl<T: NotNull> IntoNullable for Nullable<T> {
type Nullable = Nullable<T>;
}
pub trait Expression {
type SqlType;
}
pub trait Column: Expression {}
#[derive(Debug, Copy, Clone)]
//~^ ERROR the trait bound `<Col as Expression>::SqlType: NotNull` is not satisfied
pub enum ColumnInsertValue<Col, Expr> where
Col: Column,
Expr: Expression<SqlType=<Col::SqlType as IntoNullable>::Nullable>,
{
Expression(Col, Expr),
Default(Col),
}
fn main() {}
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