diff --git a/tests/pos/i8284.scala b/tests/pos/i8284.scala
new file mode 100644
index 000000000000..148ef81c67b6
--- /dev/null
+++ b/tests/pos/i8284.scala
@@ -0,0 +1,5 @@
+type Foo
+given myFoo1 as (Foo { type X = Int }) = ???
+
+type Bar = Foo { type X = Int }
+given myFoo2 as Bar = ???
\ No newline at end of file