Turn message property of the error object into a data property.

test/mjsunit/error-accessors.js

Index: test/mjsunit/error-accessors.js
diff --git a/test/mjsunit/regress/regress-cntl-descriptors-enum.js b/test/mjsunit/error-accessors.js
similarity index 67%
copy from test/mjsunit/regress/regress-cntl-descriptors-enum.js
copy to test/mjsunit/error-accessors.js
index ee72fafc8a7c67f2b1ab6cc22a734ef8033a5697..95810502405e5d5e084c756550750f3742e0825d 100644
--- a/test/mjsunit/regress/regress-cntl-descriptors-enum.js
+++ b/test/mjsunit/error-accessors.js
@@ -25,22 +25,30 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --allow-natives-syntax --expose-gc
+// Test that the message property of error objects is a data property.
 
-DontEnum = 2;
+var o;
 
-var o = {};
-%SetProperty(o, "a", 0, DontEnum);
-
-var o2 = {};
-%SetProperty(o2, "a", 0, DontEnum);
-
-assertTrue(%HaveSameMap(o, o2));
+// message is constructed using the constructor.
+var error1 = new Error("custom message");
+o = {};
+o.__proto__ = error1;
 
-o.y = 2;
+assertEquals("custom message",
+             Object.getOwnPropertyDescriptor(error1, "message").value);
+o.message = "another message";
+assertEquals("another message", o.message);
+assertEquals("custom message", error1.message);
 
-for (var v in o) { print(v); }
+// message is constructed by the runtime.
+var error2;
+try { x.x } catch (e) { error2 = e; }
 o = {};
-gc();
+o.__proto__ = error2;
+
+assertEquals("x is not defined",
+             Object.getOwnPropertyDescriptor(error2, "message").value);
+o.message = "another message";
+assertEquals("another message", o.message);
+assertEquals("x is not defined", error2.message);
 
-for (var v in o2) { print(v); }