1 files changed, 18 insertions, 0 deletions
diff --git a/test/files/neg/t2712-3.scala b/test/files/neg/t2712-3.scala
new file mode 100644
index 0000000000..85ed523489
--- /dev/null
+++ b/test/files/neg/t2712-3.scala
@@ -0,0 +1,18 @@
+package test
+
+class X1
+class X2
+class X3
+
+trait One[A]
+trait Two[A, B]
+
+class Foo extends Two[X1, X2] with One[X3]
+object Test {
+  def test1[M[_], A](x: M[A]): M[A] = x
+
+  val foo = new Foo
+
+  test1(foo): One[X3]     // fails with -Ypartial-unification enabled
+  test1(foo): Two[X1, X2] // fails without -Ypartial-unification
+}