Remove frog from the repository.

frog/lib/num.dart

-// Copyright (c) 2011, 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.
-
-// Dart core library.
-
-interface num extends Comparable, Hashable {
-  // Arithmetic operations.
-  num operator +(num other);
-  num operator -(num other);
-  num operator *(num other);
-  num operator %(num other);
-  num operator /(num other);
-  // Truncating division.
-  num operator ~/(num other);
-  // The unary '-' operator.
-  num operator negate();
-  num remainder(num other);
-
-  // Relational operations.
-  bool operator <(num other);
-  bool operator <=(num other);
-  bool operator >(num other);
-  bool operator >=(num other);
-
-  // TODO(jimhug): Cheap trick...
-  bool operator ==(var other);
-
-
-  // Predicates.
-  bool isEven();
-  bool isOdd();
-  bool isNaN();
-  bool isNegative();
-  bool isInfinite();
-
-  num abs();
-  num round();
-  num floor();
-  num ceil();
-  num truncate();
-
-  int toInt();
-  double toDouble();
-
-  String toStringAsFixed(int fractionDigits);
-  String toStringAsExponential(int fractionDigits);
-  String toStringAsPrecision(int precision);
-  String toRadixString(int radix);
-
-  // TODO(jmesserly): we need to do something in the Frog type system to know
-  // to know that most int operations are closed over integers.
-
-  // TODO(jimhug): Bit-operations stolen from int
-  int operator &(int other);
-  int operator |(int other);
-  int operator ^(int other);
-  int operator ~();
-  int operator <<(int shiftAmount);
-  int operator >>(int shiftAmount);
-}