Merge tag 'debian/1.52.1+dfsg1-1_exp2' into proxmox/buster

[rustc.git] / src / test / ui / traits / object / bounds-cycle-4.rs

diff --git a/src/test/ui/traits/object/bounds-cycle-4.rs b/src/test/ui/traits/object/bounds-cycle-4.rs
new file mode 100644 (file)
index 0000000..f83cb75
--- /dev/null
+++ b/src/test/ui/traits/object/bounds-cycle-4.rs
@@ -0,0 +1,25 @@
+// Check that we don't have a cycle when we try to normalize `Self::U` in the
+// bound below. Make sure that having a lifetime on the trait object doesn't break things
+
+// check-pass
+
+trait Is {
+    type T;
+}
+
+impl<U> Is for U {
+    type T = U;
+}
+
+trait Obj<'a> {
+    type U: Is<T = Self::V>;
+    type V;
+}
+
+fn is_obj<'a, T: ?Sized + Obj<'a>>(_: &T) {}
+
+fn f<'a>(x: &dyn Obj<'a, U = i32, V = i32>) {
+    is_obj(x)
+}
+
+fn main() {}