1.1 --- a/src/HOL/Library/Efficient_Nat.thy	Tue Jul 20 06:35:29 2010 +0200
     1.2 +++ b/src/HOL/Library/Efficient_Nat.thy	Tue Jul 20 08:54:21 2010 +0200
     1.3 @@ -312,7 +312,7 @@
     1.4    def equals(that: Nat): Boolean = this.value == that.value
     1.5  
     1.6    def as_BigInt: BigInt = this.value
     1.7 -  def as_Int: Int = if (this.value >= Math.MIN_INT && this.value <= Math.MAX_INT)
     1.8 +  def as_Int: Int = if (this.value >= Int.MinValue && this.value <= Int.MaxValue)
     1.9        this.value.intValue
    1.10      else this.value.intValue
    1.11