1 files changed, 16 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/in-trait/wf-bounds.rs b/tests/ui/impl-trait/in-trait/wf-bounds.rs
new file mode 100644
index 00000000000..2c71583b312
--- /dev/null
+++ b/tests/ui/impl-trait/in-trait/wf-bounds.rs
@@ -0,0 +1,16 @@
+// issue #101663
+
+#![feature(return_position_impl_trait_in_trait)]
+#![allow(incomplete_features)]
+
+trait Wf<T> {}
+
+trait Uwu {
+    fn nya() -> impl Wf<Vec<[u8]>>;
+    //~^ ERROR the size for values of type `[u8]` cannot be known at compilation time
+
+    fn nya2() -> impl Wf<[u8]>;
+    //~^ ERROR the size for values of type `[u8]` cannot be known at compilation time
+}
+
+fn main() {}