popBackWhile

string r0 = "bcdaaaa";
r0.popBackWhile!"a == 'a'";
assert(r0 == "bcd");

static bool lessTwo(T)(T t)
{
	return t < 2;
}
int[] r1 = [0,1,2,2,1,0];
r1.popBackWhile!lessTwo;
assert(r1 == [0,1,2,2]);

static bool posLessFive(T)(T t)
{
	return t < 5 && t > 0;
}
int[] r3 = [-1,2,3,4];
r3.popBackWhile!posLessFive;
assert(r3 == [-1]);
int[] r4 = [5,2,3,4];
r4.popBackWhile!posLessFive;
assert(r4 == [5]);