Classes: Add basic support for properties

test/mjsunit/harmony/classes.js

Index: test/mjsunit/harmony/classes.js
diff --git a/test/mjsunit/harmony/classes.js b/test/mjsunit/harmony/classes.js
index ec53b4cc38d5eff544e92cbc2a6ad6b713be844b..2051a99a60e3c531e18cf7e7944b7a469113ef49 100644
--- a/test/mjsunit/harmony/classes.js
+++ b/test/mjsunit/harmony/classes.js
@@ -245,6 +245,23 @@
 })();
 
 
+(function TestSideEffectsInPropertyDefine() {
+  function B() {}
+  B.prototype = {
+    constructor: B,
+    set m(v) {
+      throw Error();
+    }
+  };
+
+  class C extends B {
+    m() { return 1; }
+  }
+
+  assertEquals(1, new C().m());
+})();
+
+
 (function TestAccessors() {
   class C {
     // constructor(x) {