diff --git a/tests/ui/unpin_impl.rs b/tests/ui/unpin_impl.rs
new file mode 100644
index 000000000..129fcb11d
--- /dev/null
+++ b/tests/ui/unpin_impl.rs
@@ -0,0 +1,10 @@
+#[cxx::bridge]
+mod ffi {
+    extern "C++" {
+        type Opaque;
+    }
+}
+
+impl Unpin for ffi::Opaque {}
+
+fn main() {}
diff --git a/tests/ui/unpin_impl.stderr b/tests/ui/unpin_impl.stderr
new file mode 100644
index 000000000..18099bb66
--- /dev/null
+++ b/tests/ui/unpin_impl.stderr
@@ -0,0 +1,20 @@
+error[E0282]: type annotations needed
+ --> tests/ui/unpin_impl.rs:1:1
+  |
+1 | #[cxx::bridge]
+  | ^^^^^^^^^^^^^^ cannot infer type of the type parameter `Self` declared on the trait `__AmbiguousIfImpl`
+  |
+  = note: this error originates in the attribute macro `cxx::bridge` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0283]: type annotations needed
+ --> tests/ui/unpin_impl.rs:1:1
+  |
+1 | #[cxx::bridge]
+  | ^^^^^^^^^^^^^^ cannot infer type of the type parameter `Self` declared on the trait `__AmbiguousIfImpl`
+  |
+note: multiple `impl`s satisfying `ffi::Opaque: __AmbiguousIfImpl<_>` found
+ --> tests/ui/unpin_impl.rs:1:1
+  |
+1 | #[cxx::bridge]
+  | ^^^^^^^^^^^^^^
+  = note: this error originates in the attribute macro `cxx::bridge` (in Nightly builds, run with -Z macro-backtrace for more info)