Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.5)
// Compass (v1.0.0.alpha.18)
// ----

.class {
  color: red;
}

%placeholder {
  color: blue;
}

@mixin mixin() {
  color: green;
}

.foo {
  @extend .class;
}

.bar {
  @extend %placeholder;
}

.derp {
  @include mixin;
}

SassMeister-output.css

.class, .foo {
  color: red;
}

.bar {
  color: blue;
}

.derp {
  color: green;
}