1 files changed, 19 insertions, 0 deletions
diff --git a/tests/ui/type-alias-impl-trait/issue-104817.rs b/tests/ui/type-alias-impl-trait/issue-104817.rs
new file mode 100644
index 000000000..0d3bace4d
--- /dev/null
+++ b/tests/ui/type-alias-impl-trait/issue-104817.rs
@@ -0,0 +1,19 @@
+#![feature(type_alias_impl_trait)]
+#![cfg_attr(specialized, feature(specialization))]
+#![allow(incomplete_features)]
+
+// revisions: stock specialized
+// [specialized]check-pass
+
+trait OpaqueTrait {}
+impl<T> OpaqueTrait for T {}
+type OpaqueType = impl OpaqueTrait;
+fn mk_opaque() -> OpaqueType {
+    || 0
+}
+trait AnotherTrait {}
+impl<T: Send> AnotherTrait for T {}
+impl AnotherTrait for OpaqueType {}
+//[stock]~^ conflicting implementations of trait `AnotherTrait` for type `OpaqueType`
+
+fn main() {}