fix(angular.copy): throw Error if source and destination are identical

Closes #693

1 files changed, 1 insertions, 0 deletions

diff --git a/src/Angular.js b/src/Angular.js
index 2a9fb556..c14c6ea0 100644
--- a/src/Angular.js
+++ b/src/Angular.js
@@ -597,6 +597,7 @@ function copy(source, destination){
       }
     }
   } else {
+    if (source === destination) throw Error("Can't copy equivalent objects or arrays");
     if (isArray(source)) {
       while(destination.length) {
         destination.pop();