[full-codegen] Introduce NestedStatement subclass for class literals.

test/mjsunit/es6/classes.js

Index: test/mjsunit/es6/classes.js
diff --git a/test/mjsunit/es6/classes.js b/test/mjsunit/es6/classes.js
index 2684d53ff65b9c089042ed37d97996ea5e2806e1..fb77dbb8e4b01bb273512b215763dadbb1077661 100644
--- a/test/mjsunit/es6/classes.js
+++ b/test/mjsunit/es6/classes.js
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax
+// Flags: --allow-natives-syntax --harmony-do-expressions
 
 (function TestBasics() {
   var C = class C {}
@@ -994,3 +994,55 @@ function testClassRestrictedProperties(C) {
   testClassRestrictedProperties(
       class extends Class { constructor() { super(); } });
 })();
+
+
+(function testReturnFromClassLiteral() {
+
+  function usingDoExpressionInBody() {
+    let x = 42;
+    let dummy = function() {x};
+    try {
+      class C {
+        dummy() {C}
+        [do {return}]() {}
+      };
+    } finally {
+      return x;
+    }
+  }
+  assertEquals(42, usingDoExpressionInBody());
+
+  function usingDoExpressionInExtends() {
+    let x = 42;
+    let dummy = function() {x};
+    try {
+      class C extends (do {return}) { dummy() {C} };
+    } finally {
+      return x;
+    }
+  }
+  assertEquals(42, usingDoExpressionInExtends());
+
+  function usingYieldInBody() {
+    function* foo() {
+      class C {
+        [yield]() {}
+      }
+    }
+    var g = foo();
+    g.next();
+    return g.return(42).value;
+  }
+  assertEquals(42, usingYieldInBody());
+
+  function usingYieldInExtends() {
+    function* foo() {
+      class C extends (yield) {};
+    }
+    var g = foo();
+    g.next();
+    return g.return(42).value;
+  }
+  assertEquals(42, usingYieldInExtends());
+
+})();