1 files changed, 87 insertions, 0 deletions
diff --git a/src/test/ui/traits/trait-upcasting/invalid-upcast.rs b/src/test/ui/traits/trait-upcasting/invalid-upcast.rs
new file mode 100644
index 000000000..240224504
--- /dev/null
+++ b/src/test/ui/traits/trait-upcasting/invalid-upcast.rs
@@ -0,0 +1,87 @@
+#![feature(trait_upcasting)]
+#![allow(incomplete_features)]
+
+trait Foo {
+    fn a(&self) -> i32 {
+        10
+    }
+
+    fn z(&self) -> i32 {
+        11
+    }
+
+    fn y(&self) -> i32 {
+        12
+    }
+}
+
+trait Bar {
+    fn b(&self) -> i32 {
+        20
+    }
+
+    fn w(&self) -> i32 {
+        21
+    }
+}
+
+trait Baz {
+    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 _: &dyn std::fmt::Debug = baz;
+    //~^ ERROR mismatched types [E0308]
+    let _: &dyn Send = baz;
+    //~^ ERROR mismatched types [E0308]
+    let _: &dyn Sync = baz;
+    //~^ ERROR mismatched types [E0308]
+
+    let bar: &dyn Bar = baz;
+    //~^ ERROR mismatched types [E0308]
+    let _: &dyn std::fmt::Debug = bar;
+    //~^ ERROR mismatched types [E0308]
+    let _: &dyn Send = bar;
+    //~^ ERROR mismatched types [E0308]
+    let _: &dyn Sync = bar;
+    //~^ ERROR mismatched types [E0308]
+
+    let foo: &dyn Foo = baz;
+    //~^ ERROR mismatched types [E0308]
+    let _: &dyn std::fmt::Debug = foo;
+    //~^ ERROR mismatched types [E0308]
+    let _: &dyn Send = foo;
+    //~^ ERROR mismatched types [E0308]
+    let _: &dyn Sync = foo;
+    //~^ ERROR mismatched types [E0308]
+
+    let foo: &dyn Foo = bar;
+    //~^ ERROR mismatched types [E0308]
+    let _: &dyn std::fmt::Debug = foo;
+    //~^ ERROR mismatched types [E0308]
+    let _: &dyn Send = foo;
+    //~^ ERROR mismatched types [E0308]
+    let _: &dyn Sync = foo;
+    //~^ ERROR mismatched types [E0308]
+}