separate compiler and plugin tests

compiler/testData/psi/examples/collections/IIterator.jet

@@ -0,0 +1,25 @@
+open class IIterator<out T> {
+  fun next() : T
+  val hasNext : Boolean
+
+  fun toArray(buffer : MutableArray<in T>) : Int { // T is still an in-parameter
+    return fillBuffer(buffer, 0, buffer.size)
+  }
+
+  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
+
+    var count = 0;
+    for (i in from .. from + length - 1) {
+      if (!hasNext)
+        return count
+      buffer[i] = next()
+      count++
+    }
+    return count
+  }
+}