@define-color some-color currentColor;

a {
  color: currentColor;
}

b {
  color: shade (currentColor, 1.5);
}

c {
  color: alpha (currentColor, 0.5);
}

d {
  color: mix (currentColor, @some-color, 0.5);
}

e {
  color: mix (@some-color, currentColor, 0.5);
}
