new classes: special construct stub for derived classs and TDZ for `this`.

test/mjsunit/harmony/classes-experimental.js

Index: test/mjsunit/harmony/classes-experimental.js
diff --git a/test/mjsunit/harmony/classes-experimental.js b/test/mjsunit/harmony/classes-experimental.js
index 73944b182c607d82801e224c44d9e4c8bb288cf6..5a3c3e5558319941e0098dabdc712ebfd1be0e93 100644
--- a/test/mjsunit/harmony/classes-experimental.js
+++ b/test/mjsunit/harmony/classes-experimental.js
@@ -7,29 +7,51 @@
 'use strict';
 
 class Base {
-  constructor() {
+  constructor(a, b) {
     let o = new Object();
-    o.prp = 1;
+    o.prp = a + b;
     return o;
   }
 }
 
 class Subclass extends Base {
-  constructor() {
+  constructor(a, b) {
+    var exn;
     try {
       this.prp1 = 3;
     } catch (e) {
-      // TODO(dslomov): actually test the exception once TDZ is implemented.
+      exn = e;
     }
-    super();
-    assertSame(1, this.prp);
+    assertTrue(exn instanceof ReferenceError);
+    super(a, b);
+    assertSame(a + b, this.prp);
     assertSame(undefined, this.prp1);
     assertFalse(this.hasOwnProperty("prp1"));
     return this;
   }
 }
 
-let s = new Subclass();
+let b = new Base(1, 2);
+assertSame(3, b.prp);
+
+let s = new Subclass(2, -1);
 assertSame(1, s.prp);
 assertSame(undefined, s.prp1);
 assertFalse(s.hasOwnProperty("prp1"));
+
+class Subclass2 extends Base {
+  constructor() {
+    super(1,2);
+
+    let called = false;
+    function tmp() { called = true; return 3; }
+    var exn = null;
+    try {
+      super(tmp(),4);
+    } catch(e) { exn = e; }
+    assertTrue(exn !== null);
+    assertFalse(called);
+  }
+}
+
+new Subclass2();