year = matcher.group(1).toInt()
          }
        }

        pos = dateCharacterOffset(s, end + 1, limit, false)
      }

      // Convert two-digit years into four-digit years. 99 becomes 1999, 15 becomes 2015.
      if (year in 70..99) year += 1900
      if (year in 0..69) year += 2000

      // If any partial is omitted or out of range, return -1. The date is impossible. Note that leap

	if r2 < 0 {
		return "", d.mkError(ErrSyntax, "in unicode escape sequence")
	}

	// write surrogate pair
	d.scratch.addRune(utf16.DecodeRune(r, r2))
	c = d.next()
	goto scan
}

// u4 reads four bytes following a \u escape
func (d *Decoder) u4() rune {
	// logic taken from:
	// github.com/buger/jsonparser/blob/master/escape.go#L20
	var h [4]int
	for i := range 4 {
		c := d.next()
		switch {

oh! she knows such a very little!  Besides, SHE'S she, and I'm I,
and--oh dear, how puzzling it all is!  I'll try if I know all the
things I used to know.  Let me see:  four times five is twelve,
and four times six is thirteen, and four times seven is--oh dear!
I shall never get to twenty at that rate!  However, the
Multiplication Table doesn't signify:  let's try Geography.

oh! she knows such a very little!  Besides, SHE'S she, and I'm I,
and--oh dear, how puzzling it all is!  I'll try if I know all the
things I used to know.  Let me see:  four times five is twelve,
and four times six is thirteen, and four times seven is--oh dear!
I shall never get to twenty at that rate!  However, the
Multiplication Table doesn't signify:  let's try Geography.

    testRotate(
        new char[] {'0', '1', '2', '3', '4', '5', '6'},
        2,
        0,
        3,
        new char[] {'1', '2', '0', '3', '4', '5', '6'});

    // Rotate the last four elements
    testRotate(
        new char[] {'0', '1', '2', '3', '4', '5', '6'},
        -6,
        3,
        7,
        new char[] {'0', '1', '2', '5', '6', '3', '4'});
    testRotate(

    testRotate(
        new char[] {'0', '1', '2', '3', '4', '5', '6'},
        2,
        0,
        3,
        new char[] {'1', '2', '0', '3', '4', '5', '6'});

    // Rotate the last four elements
    testRotate(
        new char[] {'0', '1', '2', '3', '4', '5', '6'},
        -6,
        3,
        7,
        new char[] {'0', '1', '2', '5', '6', '3', '4'});
    testRotate(

    testRotate(new double[] {0, 1, 2, 3, 4, 5, 6}, 1, 0, 3, new double[] {2, 0, 1, 3, 4, 5, 6});
    testRotate(new double[] {0, 1, 2, 3, 4, 5, 6}, 2, 0, 3, new double[] {1, 2, 0, 3, 4, 5, 6});

    // Rotate the last four elements
    testRotate(new double[] {0, 1, 2, 3, 4, 5, 6}, -6, 3, 7, new double[] {0, 1, 2, 5, 6, 3, 4});
    testRotate(new double[] {0, 1, 2, 3, 4, 5, 6}, -5, 3, 7, new double[] {0, 1, 2, 4, 5, 6, 3});

    testRotate(new int[] {0, 1, 2, 3, 4, 5, 6}, 1, 0, 3, new int[] {2, 0, 1, 3, 4, 5, 6});
    testRotate(new int[] {0, 1, 2, 3, 4, 5, 6}, 2, 0, 3, new int[] {1, 2, 0, 3, 4, 5, 6});

    // Rotate the last four elements
    testRotate(new int[] {0, 1, 2, 3, 4, 5, 6}, -6, 3, 7, new int[] {0, 1, 2, 5, 6, 3, 4});
    testRotate(new int[] {0, 1, 2, 3, 4, 5, 6}, -5, 3, 7, new int[] {0, 1, 2, 4, 5, 6, 3});

            }
            return callable.call();
          }

          @Override
          public String toString() {
            return callable.toString();
          }
        };
    /*
     * Four futures are at play here:
     * taskFuture is the future tracking the result of the callable.
     * newFuture is a future that completes after this and all prior tasks are done.
     * oldFuture is the previous task's newFuture.

        new boolean[] {false, true, false, true, false, true, false},
        2,
        0,
        3,
        new boolean[] {true, false, false, true, false, true, false});

    // Rotate the last four elements
    testRotate(
        new boolean[] {false, true, false, true, false, true, false},
        -6,
        3,
        7,
        new boolean[] {false, true, false, true, false, true, false});