1 files changed, 14 insertions, 0 deletions
diff --git a/tests/untried/pos/t2421.scala b/tests/untried/pos/t2421.scala
new file mode 100644
index 000000000..2544a1cb3
--- /dev/null
+++ b/tests/untried/pos/t2421.scala
@@ -0,0 +1,14 @@
+object Test {
+  abstract class <~<[-From, +To] extends (From => To)
+  implicit def trivial[A]: A <~< A = sys.error("")
+
+
+  trait Forcible[T]
+  implicit val forcibleInt: (Int <~< Forcible[Int]) = sys.error("")
+
+  def headProxy[P <: Forcible[Int]](implicit w: Int <~< P): P = sys.error("")
+
+  headProxy
+  // trivial[Int] should not be considered a valid implicit, since w would have type Int <~< Int,
+  // and headProxy's type parameter P cannot be instantiated to Int
+}