1 files changed, 11 insertions, 0 deletions
diff --git a/tests/run/t4582.scala b/tests/run/t4582.scala
new file mode 100644
index 000000000..f74779154
--- /dev/null
+++ b/tests/run/t4582.scala
@@ -0,0 +1,11 @@
+object Test {
+  def main(args: Array[String]): Unit = {
+    var flag = true
+    def it = {
+        flag = false
+        Iterator(2)
+    }
+    val flat = (Iterator(Iterator(1)) ++ Iterator(it)).flatten
+    assert(flag)
+  }
+}