Update range errors to agree on the numbers.

sdk/lib/core/errors.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.
 
 part of dart.core;
 
 /**
  * Error objects thrown in the case of a program failure.
  *
  * An `Error` object represents a program failure that the programmer
@@ skipping 378 matching lines @@
   int get start => 0;
   int get end => length - 1;
 
   String get _errorName => "RangeError";
   String get _errorExplanation {
     assert(_hasValue);
     String target = Error.safeToString(indexable);
     var explanation = ": index should be less than $length";
     if (invalidValue < 0) {
       explanation = ": index must not be negative";
+    } else if (length == 0) {
+      explanation = ": list is empty";

[floitsch, 2015/09/08 10:54:19]

I don't think we should make the assumption that the receiver is a list. Could
be anything...

[Lasse Reichstein Nielsen, 2015/09/08 11:38:03]

Good point, reworded.

     }
     return explanation;
   }
 }
 
 
 /**
  * Error thrown when control reaches the end of a switch case.
  *
  * The Dart specification requires this error to be thrown when
@@ skipping 153 matching lines @@
  * the first time it is read. If evaluating the initializer expression causes
  * another read of the variable, this error is thrown.
  */
 class CyclicInitializationError extends Error {
   final String variableName;
   CyclicInitializationError([this.variableName]);
   String toString() => variableName == null
       ? "Reading static variable during its initialization"
       : "Reading static variable '$variableName' during its initialization";
 }