1 files changed, 25 insertions, 0 deletions
diff --git a/src/test/ui/impl-trait/recursive-impl-trait-type-through-non-recursive.rs b/src/test/ui/impl-trait/recursive-impl-trait-type-through-non-recursive.rs
new file mode 100644
index 000000000..818e40365
--- /dev/null
+++ b/src/test/ui/impl-trait/recursive-impl-trait-type-through-non-recursive.rs
@@ -0,0 +1,25 @@
+// Test that impl trait does not allow creating recursive types that are
+// otherwise forbidden. Even when there's an opaque type in another crate
+// hiding this.
+
+fn id<T>(t: T) -> impl Sized { t }
+
+fn recursive_id() -> impl Sized { //~ ERROR cannot resolve opaque type
+    id(recursive_id2())
+}
+
+fn recursive_id2() -> impl Sized { //~ ERROR cannot resolve opaque type
+    id(recursive_id())
+}
+
+fn wrap<T>(t: T) -> impl Sized { (t,) }
+
+fn recursive_wrap() -> impl Sized { //~ ERROR cannot resolve opaque type
+    wrap(recursive_wrap2())
+}
+
+fn recursive_wrap2() -> impl Sized { //~ ERROR cannot resolve opaque type
+    wrap(recursive_wrap())
+}
+
+fn main() {}