1 files changed, 49 insertions, 0 deletions
diff --git a/tests/ui/traits/vtable/empty-supertrait-with-nonempty-supersupertrait.rs b/tests/ui/traits/vtable/empty-supertrait-with-nonempty-supersupertrait.rs
new file mode 100644
index 00000000000..507cda63868
--- /dev/null
+++ b/tests/ui/traits/vtable/empty-supertrait-with-nonempty-supersupertrait.rs
@@ -0,0 +1,49 @@
+//@ revisions: run dump
+//@[run] run-pass
+//@[dump] check-fail
+//! Regression test for #145752
+//! Ensure that `OneTwo` contains a vptr for `TwoAgain`
+#![allow(unused)]
+#![cfg_attr(dump, feature(rustc_attrs))]
+
+trait One {
+    fn one(&self) {
+        panic!("don't call this");
+    }
+}
+impl One for () {}
+
+trait Two {
+    fn two(&self) {
+        println!("good");
+    }
+}
+impl Two for () {}
+
+trait TwoAgain: Two {}
+impl<T: Two> TwoAgain for T {}
+
+trait OneTwo: One + TwoAgain {}
+impl<T: One + Two> OneTwo for T {}
+
+fn main() {
+    (&()).two();
+    (&() as &dyn OneTwo).two();
+    (&() as &dyn OneTwo as &dyn Two).two();
+
+    // these two used to panic because they called `one` due to #145752
+    (&() as &dyn OneTwo as &dyn TwoAgain).two();
+    (&() as &dyn OneTwo as &dyn TwoAgain as &dyn Two).two();
+}
+
+#[cfg_attr(dump, rustc_dump_vtable)]
+type T = dyn OneTwo;
+//[dump]~^ ERROR vtable entries: [
+//[dump]~| ERROR            MetadataDropInPlace,
+//[dump]~| ERROR            MetadataSize,
+//[dump]~| ERROR            MetadataAlign,
+//[dump]~| ERROR            Method(<dyn OneTwo as One>::one - shim(reify)),
+//[dump]~| ERROR            Method(<dyn OneTwo as Two>::two - shim(reify)),
+//[dump]~| ERROR            TraitVPtr(<dyn OneTwo as Two>),
+//[dump]~| ERROR            TraitVPtr(<dyn OneTwo as TwoAgain>),
+//[dump]~| ERROR        ]