1 files changed, 33 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/issue-67844-nested-opaque.rs b/src/test/ui/type-alias-impl-trait/issue-67844-nested-opaque.rs
new file mode 100644
index 000000000..cd219328a
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-67844-nested-opaque.rs
@@ -0,0 +1,33 @@
+// check-pass
+// Regression test for issue #67844
+// Ensures that we properly handle nested TAIT occurrences
+// with generic parameters
+
+#![feature(type_alias_impl_trait)]
+
+trait WithAssoc {
+    type AssocType;
+}
+
+trait WithParam<A> {}
+
+type Return<A> = impl WithAssoc<AssocType = impl WithParam<A>>;
+
+struct MyParam;
+impl<A> WithParam<A> for MyParam {}
+
+struct MyStruct;
+
+impl WithAssoc for MyStruct {
+    type AssocType = MyParam;
+}
+
+fn my_fun<A>() -> Return<A> {
+    MyStruct
+}
+
+fn my_other_fn<A>() -> impl WithAssoc<AssocType = impl WithParam<A>> {
+    MyStruct
+}
+
+fn main() {}