- Split the implementation of NoSuchMethodError in preparation for

runtime/lib/errors_patch.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 patch class Error {
   /* patch */ static String _objectToString(Object object) {
     return Object._toString(object);
   }
 }
 
@@ skipping 19 matching lines @@
     for (int i = 0; i < numNamedArguments; i++) {
       var arg_value = arguments[numPositionalArguments + i];
       namedArguments[argumentNames[i]] = arg_value;
     }
     throw new NoSuchMethodError(receiver,
                                 memberName,
                                 positionalArguments,
                                 namedArguments,
                                 existingArgumentNames);
   }
+
+  const NoSuchMethodError(Object this._receiver,
+                          String this._memberName,
+                          List this._arguments,
+                          Map<String,dynamic> this._namedArguments,
+                          [List existingArgumentNames = null])
+      : this._existingArgumentNames = existingArgumentNames;
+
+  /* patch */ String toString() {
+    StringBuffer actual_buf = new StringBuffer();
+    int i = 0;
+    if (_arguments != null) {
+      for (; i < _arguments.length; i++) {
+        if (i > 0) {
+          actual_buf.add(", ");
+        }
+        actual_buf.add(Error.safeToString(_arguments[i]));
+      }
+    }
+    if (_namedArguments != null) {
+      _namedArguments.forEach((String key, var value) {
+        if (i > 0) {
+          actual_buf.add(", ");
+        }
+        actual_buf.add(key);
+        actual_buf.add(": ");
+        actual_buf.add(Error.safeToString(value));
+        i++;
+      });
+    }
+    StringBuffer msg_buf = new StringBuffer();
+    if (_existingArgumentNames == null) {
+      msg_buf.add(
+          "NoSuchMethodError : method not found: '$_memberName'\n"
+          "Receiver: ${Error.safeToString(_receiver)}\n"
+          "Arguments: [$actual_buf]");
+    } else {
+      String actualParameters = actual_buf.toString();
+      StringBuffer formal_buf = new StringBuffer();
+      for (int i = 0; i < _existingArgumentNames.length; i++) {
+        if (i > 0) {
+          formal_buf.add(", ");
+        }
+        formal_buf.add(_existingArgumentNames[i]);
+      }
+      String formalParameters = formal_buf.toString();
+      msg_buf.add( 
+          "NoSuchMethodError: incorrect number of arguments passed to "
+          "method named '$_memberName'\n"
+          "Receiver: ${Error.safeToString(_receiver)}\n"
+          "Tried calling: $_memberName($actualParameters)\n"
+          "Found: $_memberName($formalParameters)");
+    }
+    return msg_buf.toString();
+  }
 }