diff --git a/js/js.translator/testFiles/webDemoCanvasExamples/cases/Creatures.kt b/js/js.translator/testFiles/webDemoCanvasExamples/cases/Creatures.kt
index c91e2484624..4984ead30df 100644
--- a/js/js.translator/testFiles/webDemoCanvasExamples/cases/Creatures.kt
+++ b/js/js.translator/testFiles/webDemoCanvasExamples/cases/Creatures.kt
@@ -226,14 +226,14 @@ class CanvasState(val canvas: HTMLCanvasElement) {
 
         jq(canvas).mousemove {
             if (selection != null) {
-                selection.sure().pos = mousePos(it) - dragOff
+                selection!!.pos = mousePos(it) - dragOff
                 valid = false
             }
         }
 
         jq(canvas).mouseup {
             if (selection != null) {
-                selection.sure().selected = false
+                selection!!.selected = false
             }
             selection = null
             valid = false
@@ -254,7 +254,7 @@ class CanvasState(val canvas: HTMLCanvasElement) {
         var offset = Vector()
         var element: HTMLElement? = canvas
         while (element != null) {
-            val el: HTMLElement = element.sure()
+            val el: HTMLElement = element!!
             offset += Vector(el.offsetLeft, el.offsetTop)
             element = el.offsetParent
         }
diff --git a/js/js.translator/testFiles/webDemoCanvasExamples/cases/Traffic light.kt b/js/js.translator/testFiles/webDemoCanvasExamples/cases/Traffic light.kt
index 35c31895899..eabc4564391 100644
--- a/js/js.translator/testFiles/webDemoCanvasExamples/cases/Traffic light.kt	
+++ b/js/js.translator/testFiles/webDemoCanvasExamples/cases/Traffic light.kt	
@@ -430,7 +430,7 @@ class CanvasState(val canvas: HTMLCanvasElement) {
         var offset = Vector()
         var element: HTMLElement? = canvas
         while (element != null) {
-            val el: HTMLElement = element.sure()
+            val el: HTMLElement = element!!
             offset += Vector(el.offsetLeft, el.offsetTop)
             element = el.offsetParent
         }
diff --git a/js/js.translator/testFiles/webDemoExamples2/cases/builder.kt b/js/js.translator/testFiles/webDemoExamples2/cases/builder.kt
index 2bae4e90e95..78cab743d76 100644
--- a/js/js.translator/testFiles/webDemoExamples2/cases/builder.kt
+++ b/js/js.translator/testFiles/webDemoExamples2/cases/builder.kt
@@ -128,7 +128,7 @@ class P() : BodyTag("p")
 class H1() : BodyTag("h1")
 class A() : BodyTag("a") {
   public var href : String
-  get() = attributes["href"].sure()
+  get() = attributes["href"]!!
   set(value) {
     attributes["href"] = value
   }
diff --git a/js/js.translator/testFiles/webDemoExamples2/cases/life.kt b/js/js.translator/testFiles/webDemoExamples2/cases/life.kt
index a525dc79193..6f1da594f5a 100644
--- a/js/js.translator/testFiles/webDemoExamples2/cases/life.kt
+++ b/js/js.translator/testFiles/webDemoExamples2/cases/life.kt
@@ -139,7 +139,7 @@ fun makeField(s : String) : Field {
           val l1 : Int = o1.size
           val l2 = o2.size
           l1 - l2
-  }).sure()
+  })!!
   val data = Array(lines.size) {Array(w.size) {false}}
 
   // workaround
@@ -160,7 +160,7 @@ fun makeField(s : String) : Field {
 }
 
 // An excerpt from the Standard Library
-val String?.indices : IntRange get() = IntRange(0, this.sure().size)
+val String?.indices : IntRange get() = IntRange(0, this!!.size)
 
 fun <K, V> MutableMap<K, V>.set(k : K, v : V) { put(k, v) }
 
diff --git a/js/js.translator/testFiles/webDemoExamples2/cases/maze.kt b/js/js.translator/testFiles/webDemoExamples2/cases/maze.kt
index 4467dee98a8..52d86463ef9 100644
--- a/js/js.translator/testFiles/webDemoExamples2/cases/maze.kt
+++ b/js/js.translator/testFiles/webDemoExamples2/cases/maze.kt
@@ -171,12 +171,12 @@ fun printMaze(str : String) {
  *    OOOOOOOOOOOOOOOOO
  */
 fun makeMaze(s : String) : Maze {
-  val lines = s.split("\n").sure()
+  val lines = s.split("\n")!!
   val w = max<String?>(lines.toList(), comparator<String?> {o1, o2 ->
           val l1 : Int = o1?.size ?: 0
           val l2 = o2?.size ?: 0
           l1 - l2
-  }).sure()
+  })!!
   val data = Array<Array<Boolean>>(lines.size) {Array<Boolean>(w.size) {false}}
 
   var start : #(Int, Int)? = null
@@ -184,7 +184,7 @@ fun makeMaze(s : String) : Maze {
 
   for (line in lines.indices) {
     for (x in lines[line].indices) {
-      val c = lines[line].sure()[x]
+      val c = lines[line]!![x]
       data[line][x] = c == 'O'
       when (c) {
         'I' -> start = #(line, x)
@@ -202,12 +202,12 @@ fun makeMaze(s : String) : Maze {
       throw IllegalArgumentException("No goal point in the maze (should be indicated with a '$' sign)")
   }
 
-  return Maze(w.size, lines.size, data, start.sure(), end.sure())
+  return Maze(w.size, lines.size, data, start!!, end!!)
 }
 
 
 // An excerpt from the Standard Library
-val String?.indices : IntRange get() = IntRange(0, this.sure().size)
+val String?.indices : IntRange get() = IntRange(0, this!!.size)
 
 fun <K, V> Map<K, V>.set(k : K, v : V) { put(k, v) }