Renamed *.jet to *.kt in test data of JetPsiCheckerTest.

idea/testData/checker/NestedObjects.kt

@@ -0,0 +1,28 @@
+package nestedObjects
+  object A {
+    val b = B
+    val d = A.B.A
+
+    object B {
+      val a = A
+      val e = B.A
+
+      object A {
+        val a = A
+        val b = B
+        val x = nestedObjects.A.B.A
+        val y = this<error>@A</error>
+      }
+    }
+
+  }
+  object B {
+    val b = B
+    val c = A.B
+  }
+
+  val a = A
+  val b = B
+  val c = A.B
+  val d = A.B.A
+  val e = B.<error>A</error>.B