1 files changed, 44 insertions, 0 deletions
diff --git a/tests/ui/traits/vtable/vtable-diamond.rs b/tests/ui/traits/vtable/vtable-diamond.rs
new file mode 100644
index 000000000..dc3c17ac3
--- /dev/null
+++ b/tests/ui/traits/vtable/vtable-diamond.rs
@@ -0,0 +1,44 @@
+// build-fail
+#![feature(rustc_attrs)]
+
+#[rustc_dump_vtable]
+trait A {
+    fn foo_a(&self) {}
+}
+
+#[rustc_dump_vtable]
+trait B: A {
+    fn foo_b(&self) {}
+}
+
+#[rustc_dump_vtable]
+trait C: A {
+    //~^ error vtable
+    fn foo_c(&self) {}
+}
+
+#[rustc_dump_vtable]
+trait D: B + C {
+    //~^ error vtable
+    fn foo_d(&self) {}
+}
+
+struct S;
+
+impl A for S {}
+impl B for S {}
+impl C for S {}
+impl D for S {}
+
+fn foo(d: &dyn D) {
+    d.foo_d();
+}
+
+fn bar(d: &dyn C) {
+    d.foo_c();
+}
+
+fn main() {
+    foo(&S);
+    bar(&S);
+}