Add test for #3340 with a side effect

Author: nicolasstucki

tests/run/i3340.check

@@ -1,5 +1,7 @@
-Test$.f1(i3340.scala:12)
-Test$.f2(i3340.scala:16)
-Test$.f3(i3340.scala:20)
-Test$.f4(i3340.scala:27)
-Test$.f5(i3340.scala:34)
+Test$.f1(i3340.scala:13)
+Test$.f2(i3340.scala:17)
+Test$.f3(i3340.scala:21)
+Test$.f4(i3340.scala:28)
+Test$.f5(i3340.scala:35)
+foo
+Test$.f6(i3340.scala:42)

tests/run/i3340.scala

@@ -5,6 +5,7 @@ object Test {
     printlnStackLine(f3)
     printlnStackLine(f4)
     printlnStackLine(f5)
+    printlnStackLine(f6)
   }
 
   def f1: Unit = {
@@ -35,6 +36,13 @@ object Test {
     ()
   }
 
+  def f6: Unit = {
+    val n: Any = null
+    val a: Nothing =
+      { println("foo"); n }.asInstanceOf[Nothing] // throws here
+    ()
+  }
+
   def printlnStackLine(t: => Any): Unit = {
     try t
     catch {