1 files changed, 10 insertions, 0 deletions
diff --git a/src/test/ui/regions/regions-wf-trait-object.rs b/src/test/ui/regions/regions-wf-trait-object.rs
new file mode 100644
index 000000000..d0053b202
--- /dev/null
+++ b/src/test/ui/regions/regions-wf-trait-object.rs
@@ -0,0 +1,10 @@
+// Check that the explicit lifetime bound (`'b`, in this example) must
+// outlive all the superbound from the trait (`'a`, in this example).
+
+trait TheTrait<'t>: 't { }
+
+struct Foo<'a,'b> {
+    x: Box<dyn TheTrait<'a>+'b> //~ ERROR E0478
+}
+
+fn main() { }