Relaxed.java

public class Relaxed { 
	//@ ensures pat.length > 0 && a.length > 0 ==>  Relaxed.diffIndex(pat, a) == pat.length ==> \result == true;
	 public static boolean isRelaxedPrefix(int[] pat, int[] a) {
	    if (Relaxed.diffIndex(pat, a) == pat.length) return true;
	   //@ maintaining  Relaxed.diffIndex(pat, a) >  0 ==> (\forall int j; Relaxed.diffIndex(pat, a) < j && j < 0; pat[j] == a[j - 1]);
	    while(pat.length > 0){}
	    return true;
	}

	public /*@ pure  @*/ static int diffIndex(int[] pat, int[] a)
	{
		return 0;
	}
}

// FIXME - This test is OK if diffIndex is declared @Function, but not otherwise -- why?