Merge pull request #5632 from adriaanm/ticket/9114

SI-9114 Fix crasher in pattern matcher with type aliases

1 files changed, 31 insertions, 0 deletions

diff --git a/test/files/run/t9114.scala b/test/files/run/t9114.scala
new file mode 100644
index 0000000000..656a5c7d8d
--- /dev/null
+++ b/test/files/run/t9114.scala
@@ -0,0 +1,31 @@
+import annotation.unchecked
+
+class Test {
+  trait Two[A, B]
+  type One[A] = Two[A,A]
+  class View extends One[Any]
+
+  def checkAny(x: Some[One[Any]]) = x match { // okay
+    case Some(_: View) => true
+    case _ => false
+  }
+  def checkAbstract[A](x: Some[One[A]]) = x match { // okay
+    case Some(_: View) => true
+    case _ => false
+  }
+
+  def checkExistential(x: Some[One[_]]) = x match {
+    case Some(_: View) => true // compiler crash
+    case _ => false
+  }
+}
+
+object Test {
+  def main(args: Array[String]): Unit = {
+    val t1 = new Test
+    val t2 = new Test
+    assert(t1.checkAny(Some(new t1.View)))
+    assert(t1.checkAbstract(Some(new t1.View)))
+    assert(t1.checkExistential(Some(new t1.View)))
+  }
+}