Issue 82: improve toString() of bundled scopes

git-svn-id: https://google-guice.googlecode.com/svn/trunk@319 d779f126-a31b-0410-b53b-1d3aecad763e
diff --git a/src/com/google/inject/Scopes.java b/src/com/google/inject/Scopes.java
index 31f3d69..b0b040e 100644
--- a/src/com/google/inject/Scopes.java
+++ b/src/com/google/inject/Scopes.java
@@ -58,7 +58,7 @@
         }
 
         public String toString() {
-          return creator.toString();
+          return String.format("%s[%s]", creator, SINGLETON);
         }
       };
     }