1 files changed, 39 insertions, 0 deletions
diff --git a/src/test/ui/traits/impl-evaluation-order.rs b/src/test/ui/traits/impl-evaluation-order.rs
new file mode 100644
index 000000000..57809d89a
--- /dev/null
+++ b/src/test/ui/traits/impl-evaluation-order.rs
@@ -0,0 +1,39 @@
+// Regression test for #79902
+
+// Check that evaluation (which is used to determine whether to copy a type in
+// MIR building) evaluates bounds from normalizing an impl after evaluating
+// any bounds on the impl.
+
+// check-pass
+
+trait A {
+    type B;
+}
+trait M {}
+
+struct G<T, U>(*const T, *const U);
+
+impl<T, U> Clone for G<T, U> {
+    fn clone(&self) -> Self {
+        G { ..*self }
+    }
+}
+
+impl<T, U> Copy for G<T, U::B>
+where
+    T: A<B = U>,
+    U: A,
+{
+}
+
+impl A for () {
+    type B = ();
+}
+
+fn is_m<T: M>(_: T) {}
+
+fn main() {
+    let x = G(&(), &());
+    drop(x);
+    drop(x);
+}