1 files changed, 22 insertions, 0 deletions
diff --git a/src/test/ui/traits/pointee-tail-is-generic-errors.rs b/src/test/ui/traits/pointee-tail-is-generic-errors.rs
new file mode 100644
index 000000000..28bc1da96
--- /dev/null
+++ b/src/test/ui/traits/pointee-tail-is-generic-errors.rs
@@ -0,0 +1,22 @@
+// edition:2018
+
+#![feature(ptr_metadata)]
+#![feature(type_alias_impl_trait)]
+
+type Opaque = impl std::fmt::Debug + ?Sized;
+
+fn opaque() -> &'static Opaque {
+    &[1] as &[i32]
+}
+
+fn a<T: ?Sized>() {
+    is_thin::<T>();
+    //~^ ERROR type mismatch resolving `<T as Pointee>::Metadata == ()`
+
+    is_thin::<Opaque>();
+    //~^ ERROR type mismatch resolving `<Opaque as Pointee>::Metadata == ()`
+}
+
+fn is_thin<T: std::ptr::Pointee<Metadata = ()> + ?Sized>() {}
+
+fn main() {}