1 files changed, 69 insertions, 0 deletions
diff --git a/tests/ui/traits/trait-upcasting/subtrait-method.rs b/tests/ui/traits/trait-upcasting/subtrait-method.rs
new file mode 100644
index 00000000000..136d15af0e8
--- /dev/null
+++ b/tests/ui/traits/trait-upcasting/subtrait-method.rs
@@ -0,0 +1,69 @@
+#![feature(trait_upcasting)]
+
+trait Foo: PartialEq<i32> + std::fmt::Debug + Send + Sync {
+    fn a(&self) -> i32 {
+        10
+    }
+
+    fn z(&self) -> i32 {
+        11
+    }
+
+    fn y(&self) -> i32 {
+        12
+    }
+}
+
+trait Bar: Foo {
+    fn b(&self) -> i32 {
+        20
+    }
+
+    fn w(&self) -> i32 {
+        21
+    }
+}
+
+trait Baz: Bar {
+    fn c(&self) -> i32 {
+        30
+    }
+}
+
+impl Foo for i32 {
+    fn a(&self) -> i32 {
+        100
+    }
+}
+
+impl Bar for i32 {
+    fn b(&self) -> i32 {
+        200
+    }
+}
+
+impl Baz for i32 {
+    fn c(&self) -> i32 {
+        300
+    }
+}
+
+fn main() {
+    let baz: &dyn Baz = &1;
+
+    let bar: &dyn Bar = baz;
+    bar.c();
+    //~^ ERROR no method named `c` found for reference `&dyn Bar` in the current scope [E0599]
+
+    let foo: &dyn Foo = baz;
+    foo.b();
+    //~^ ERROR no method named `b` found for reference `&dyn Foo` in the current scope [E0599]
+    foo.c();
+    //~^ ERROR no method named `c` found for reference `&dyn Foo` in the current scope [E0599]
+
+    let foo: &dyn Foo = bar;
+    foo.b();
+    //~^ ERROR no method named `b` found for reference `&dyn Foo` in the current scope [E0599]
+    foo.c();
+    //~^ ERROR no method named `c` found for reference `&dyn Foo` in the current scope [E0599]
+}