Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.2)
// Compass (v1.0.0.alpha.17)
// Susy (v2.0.0.beta.2)
// ----

@import "susy";

$gt-tablet-port: 50em;

@mixin breakpoint($point) {

  @if $point == gt-mobile-port { // when screen size is greater than default mobile to tablet portrait
  	@media (min-width: $gt-mobile-port) { @content; }
  }
  @if $point == gt-mobile { // when screen size is greater than default mobile to tablet portrait
  	@media (min-width: $gt-mobile) { @content; }
  }
  @if $point == gt-tablet-port { // when screen size is greater than tablet portrait to landscape
  	@media (min-width: $gt-tablet-port) { @content; }
  }
  @if $point == gt-tablet-port-1 { // when screen size is greater than tablet portrait to landscape
      @media (min-width: $gt-tablet-port-1) { @content; }
  }
  @if $point == at-max { // when screen size is at maximum width
  	@media (min-width: $at-max) { @content; }
  }
  // @else if $point == gt- {
  //   @media (min-width: 650px)  { @content; }
  // }
}

.class{
	@include breakpoint(gt-tablet-port){
		@include span-columns(4);
	}
}
 
.anotherClass{
	@extend .class;
	@include breakpoint(gt-tablet-port){
		@include omega;
	}
}

SassMeister-output.css

Undefined mixin 'span-columns'.