Java 8 rules for method overrides:

- report errors on implementing methods of Any in interfaces
- update testData

~~~

Java 8 override restrictions: interface can't implement a method of 'Any'
- update compiler sources

js/js.translator/testData/webDemoExamples2/cases/builder.kt

@@ -45,8 +45,8 @@ fun main(args: Array<String>) {
     println(result)
 }
 
-interface Element {
-    fun render(builder: StringBuilder, indent: String)
+abstract class Element {
+    abstract fun render(builder: StringBuilder, indent: String)
 
     override fun toString(): String {
         val builder = StringBuilder()
@@ -55,13 +55,13 @@ interface Element {
     }
 }
 
-class TextElement(val text: String) : Element {
+class TextElement(val text: String) : Element() {
     override fun render(builder: StringBuilder, indent: String) {
         builder.append("$indent$text\n")
     }
 }
 
-abstract class Tag(val name: String) : Element {
+abstract class Tag(val name: String) : Element() {
     val children = ArrayList<Element>()
     val attributes = HashMap<String, String>()