Support using an executor as a function to execute a block.

libraries/stdlib/test/concurrent/ThreadTest.kt

@@ -0,0 +1,21 @@
+package concurrent
+
+import kotlin.concurrent.*
+import kotlin.test.*
+
+import org.junit.Test as test
+
+import java.util.concurrent.*
+import java.util.concurrent.TimeUnit.*
+
+class ThreadTest {
+    test fun scheduledTask() {
+
+        val pool = Executors.newFixedThreadPool(1).sure()
+        val countDown = CountDownLatch(1)
+        pool {
+            countDown.countDown()
+        }
+        assertTrue(countDown.await(2, SECONDS), "Count down is executed")
+    }
+}