Projections & Initial grammar

examples/.idea/modules.xml

@@ -3,6 +3,7 @@
   <component name="ProjectModuleManager">
     <modules>
       <module fileurl="file://$PROJECT_DIR$/examples.iml" filepath="$PROJECT_DIR$/examples.iml" />
+      <module fileurl="file://$PROJECT_DIR$/../grammar/grammar.iml" filepath="$PROJECT_DIR$/../grammar/grammar.iml" />
     </modules>
   </component>
 </project>

examples/src/collections/IIterator.jetl

@@ -2,16 +2,16 @@ interface class IIterator<out T> {
   fun next() : T
   val hasNext : Boolean
 
-  fun toArray(buffer : WriteOnlyArray<T>) : Int { // T is still an in-parameter
+  fun toArray(buffer : MutableArray<in T>) : Int { // T is still an in-parameter
     return fillBuffer(buffer, 0, buffer.size)
   }
 
-  fun toArray(buffer : WriteOnlyArray<T>, from : Int, length : Int) : Int { // T is still an in-parameter
+  fun toArray(buffer : MutableArray<in T>, from : Int, length : Int) : Int { // T is still an in-parameter
     if (from < 0 || from > buffer.lastIndex || length < 0 || length > buffer.size - from) {
       throw IndexOutOfBoundsException();
     }
 
-    if (len == 0) return 0;
+    if (len == 0) return 0
 
     var count = 0;
     for (i in [from .. from + length - 1]) {