Change new List(n) to return fixed length list.

pkg/fixnum/lib/src/int64.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 fixnum;
 
 /**
  * An immutable 64-bit signed integer, in the range [-2^63, 2^63 - 1].
  * Arithmetic operations may overflow in order to maintain this range.
  */
@@ skipping 607 matching lines @@
 
     zeros = int32._numberOfTrailingZeros(_h);
     if (zeros < 32) {
       return _BITS01 + zeros;
     }
     // All zeros
     return 64;
   }
 
   List<int> toBytes() {
-    List<int> result = new List<int>.fixedLength(8);
+    List<int> result = new List<int>(8);
     result[0] = _l & 0xff;
     result[1] = (_l >> 8) & 0xff;
     result[2] = ((_m << 6) & 0xfc) | ((_l >> 16) & 0x3f);
     result[3] = (_m >> 2) & 0xff;
     result[4] = (_m >> 10) & 0xff;
     result[5] = ((_h << 4) & 0xf0) | ((_m >> 18) & 0xf);
     result[6] = (_h >> 4) & 0xff;
     result[7] = (_h >> 12) & 0xff;
     return result;
   }
@@ skipping 449 matching lines @@
         }
       }
       return ZERO;
     }
 
     // Generate the quotient using bit-at-a-time long division.
     return _divModHelper(aIsCopy ? a : new int64._copy(a), b, negative,
         aIsNegative, aIsMinValue, computeRemainder);
   }
 }