--- /dev/null
+// compile-flags: -Ztrait-solver=next
+
+// Check that `<T::Assoc as DiscriminantKind>::Discriminant` doesn't normalize
+// to itself and cause overflow/ambiguity.
+
+trait Foo {
+ type Assoc;
+}
+
+trait Bar {}
+fn needs_bar(_: impl Bar) {}
+
+fn foo<T: Foo>(x: T::Assoc) {
+ needs_bar(std::mem::discriminant(&x));
+ //~^ ERROR the trait bound `Discriminant<<T as Foo>::Assoc>: Bar` is not satisfied
+}
+
+fn main() {}