deprecation.diff

diff --git a/frameworks/runtime/core.js b/frameworks/runtime/core.js
index 67bef70..a852a22 100644
--- a/frameworks/runtime/core.js
+++ b/frameworks/runtime/core.js
@@ -756,8 +756,37 @@ SC.mixin(/** @scope SC */ {
   stringsFor: function(lang, strings) {
     SC.mixin(SC.STRINGS, strings);
     return this ;
-  }
+  },
+
 
+  // ..........................................................
+  // DEPRECATION SUPPORT
+  // 
+
+  /**
+    Creates a computed property for use on SC.Object that will raise
+    a warning if a property is get or set.
+  */
+  deprecated: function(msg) {
+    // we only want to do this if we're in debug mode, otherwise return an empty function
+    if (SC.buildMode !== 'debug' || console.warn === undefined) return SC.K;
+    
+    return function(key, value) {
+      // fast path: we're dealing with a property labelled as a deprecated
+      if (SC.kindOf(this, SC.Object) && key && this.hasOwnProperty(key) && this[key].isProperty) {
+        console.warn(msg || "%@.%@ is deprecated. Please remove references to it.".fmt(this, key));
+      } else {
+        // find the function
+        for (key in this) {
+          if (!this.hasOwnProperty(key)) continue;
+          if (this[key] === arguments.callee) {
+            console.warn(msg || "%@.%@() is deprecated. Please remove references to it.".fmt(this, key));
+            break;
+          }
+        }
+      }
+    };
+  }
 
 }); // end mixin
 

example.js

myObject = SC.Object.create({

    myProperty: SC.deprecated().property(),
    myMethod: SC.deprecated()

});

myObject.get('myProperty'); // raises a warning in the browser console
myObject.myMethod(); // also raises a warning