Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.6)
// Compass (v1.0.1)
// ----

// Margin
@mixin margin($top: 0, $right: $top or $left, $bottom: $top, $left: $right or $top) {
  margin: $top $right $bottom $left;
}

.element {
  @include margin(10, $left: 20);
}
.element2 {
  @include margin(10,20)
}

SassMeister-output.css

.element {
  margin: 10 10 10 20;
}

.element2 {
  margin: 10 20 10 20;
}