1 files changed, 33 insertions, 0 deletions
diff --git a/tests/ui/associated-types/issue-38821.rs b/tests/ui/associated-types/issue-38821.rs
new file mode 100644
index 000000000..6753860e9
--- /dev/null
+++ b/tests/ui/associated-types/issue-38821.rs
@@ -0,0 +1,33 @@
+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() {}