1 files changed, 19 insertions, 0 deletions
diff --git a/tests/run/t1697.scala b/tests/run/t1697.scala
new file mode 100644
index 000000000..39dcdd732
--- /dev/null
+++ b/tests/run/t1697.scala
@@ -0,0 +1,19 @@
+class Term
+case class Num(n: Int) extends Term
+case class Add(x: Term, y: Term) extends Term
+
+object Value {
+  def unapply(term: Any): Boolean = true
+}
+
+object Test {
+  def main(args: Array[String]): Unit = {
+    val term = Add(Num(1), Add(Num(2), Num(3)))
+    val res = term match {
+      case Add(Num(x), Num(y))    => "Add(Num, Num)"
+      case Add(Value(), y)        => "Add(Value, ?)"
+      case _                      => "?"
+    }
+    assert(res == "Add(Value, ?)")
+  }
+}