unfork DDC's copy of most SDK libraries

sdk/lib/_internal/js_runtime/lib/core_patch.dart

Index: sdk/lib/_internal/js_runtime/lib/core_patch.dart
diff --git a/sdk/lib/_internal/js_runtime/lib/core_patch.dart b/sdk/lib/_internal/js_runtime/lib/core_patch.dart
index e5e76bfa6478fc459621dd449463ed15e6fbaab9..474bf6adc5d982f0d29b26a336826f3b8c2c2685 100644
--- a/sdk/lib/_internal/js_runtime/lib/core_patch.dart
+++ b/sdk/lib/_internal/js_runtime/lib/core_patch.dart
@@ -586,38 +586,46 @@ class NoSuchMethodError {
 
   @patch
   String toString() {
-    StringBuffer sb = new StringBuffer('');
-    String comma = '';
+    StringBuffer sb = new StringBuffer();
+    int i = 0;
     if (_arguments != null) {
-      for (var argument in _arguments) {
-        sb.write(comma);
-        sb.write(Error.safeToString(argument));
-        comma = ', ';
+      for (; i < _arguments.length; i++) {
+        if (i > 0) {
+          sb.write(", ");
+        }
+        sb.write(Error.safeToString(_arguments[i]));
       }
     }
     if (_namedArguments != null) {
       _namedArguments.forEach((Symbol key, var value) {
-        sb.write(comma);
+        if (i > 0) {
+          sb.write(", ");
+        }
         sb.write(_symbolToString(key));
         sb.write(": ");
         sb.write(Error.safeToString(value));
-        comma = ', ';
+        i++;
       });
     }
-    String memberName = _symbolToString(_memberName);
-    String receiverText = Error.safeToString(_receiver);
-    String actualParameters = '$sb';
     if (_existingArgumentNames == null) {
-      return "NoSuchMethodError: method not found: '$memberName'\n"
-          "Receiver: ${receiverText}\n"
-          "Arguments: [$actualParameters]";
+      return "NoSuchMethodError : method not found: '$_memberName'\n"
+          "Receiver: ${Error.safeToString(_receiver)}\n"
+          "Arguments: [$sb]";
     } else {
-      String formalParameters = _existingArgumentNames.join(', ');
+      String actualParameters = sb.toString();
+      sb = new StringBuffer();
+      for (int i = 0; i < _existingArgumentNames.length; i++) {
+        if (i > 0) {
+          sb.write(", ");
+        }
+        sb.write(_existingArgumentNames[i]);
+      }
+      String formalParameters = sb.toString();
       return "NoSuchMethodError: incorrect number of arguments passed to "
-          "method named '$memberName'\n"
-          "Receiver: ${receiverText}\n"
-          "Tried calling: $memberName($actualParameters)\n"
-          "Found: $memberName($formalParameters)";
+          "method named '$_memberName'\n"
+          "Receiver: ${Error.safeToString(_receiver)}\n"
+          "Tried calling: $_memberName($actualParameters)\n"
+          "Found: $_memberName($formalParameters)";
     }
   }
 }