added test cases for KT-1619 and KT-1617

libraries/stdlib/test/regressions/Kt1617Test.kt

@@ -0,0 +1,20 @@
+package regressions
+
+// TODO comment out the next line to reproduce KT-1617
+import kotlin.util.map
+import kotlin.util.arrayList
+
+import java.util.Collection
+import java.io.File
+
+import junit.framework.TestCase
+
+class Kt1617Test: TestCase() {
+    fun testMapFunction() {
+        val coll: Collection<String> = arrayList("foo", "bar")
+
+        val files =  coll.map<String, File>{ File(it) }
+
+        println("Found files: $files")
+    }
+}

libraries/stdlib/test/regressions/Kt1619Test.kt

@@ -0,0 +1,18 @@
+package regressions
+
+import junit.framework.TestCase
+import java.util.List
+import kotlin.util.arrayList
+
+class Kt1619Test: TestCase() {
+
+    fun doSomething(list: List<String?>): Boolean {
+        return list.size() > 0
+    }
+
+    fun testCollectionNotNullCanBeUsedForNullables() {
+        val list: List<String> = arrayList("foo", "bar")
+        // TODO uncomment this line to reproduce KT-1619
+        // doSomething(list)
+    }
+}