// tail -c n
assert([1, 2, 3].tail(1) == [3]);
assert([1, 2, 3].tail(2) == [2, 3]);
assert([1, 2, 3].tail(3) == [1, 2, 3]);
assert([1, 2, 3].tail(4) == [1, 2, 3]);
assert([1, 2, 3].tail(0).length == 0);

// tail --lines=n
import std.algorithm.comparison : equal;
import std.algorithm.iteration : joiner;
import std.exception : assumeWontThrow;
import std.string : lineSplitter;
assert("one\ntwo\nthree"
    .lineSplitter
    .tail(2)
    .joiner("\n")
    .equal("two\nthree")
    .assumeWontThrow);