Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.8)
// Compass (v1.0.0.alpha.19)
// ----



@mixin smart-extend($placeholder-name)
{
  @extend %#{$placeholder-name} !optional;
}

$smart-cache: ();
@mixin smart-cache($declarations) {
  
  @debug $declarations;

  // Looping through all properties/values from map
  @each $property, $value in $declarations {
    // Get the stored values for the current property
    $stored-values: map-get($smart-cache, $property);
 
    // If the value doesn't exist in stored values
    @if not index($stored-values, $value) {
      // Add it
      $smart-cache: map-merge($smart-cache, ($property: append($stored-values or (), $value))) !global;
      // And create a placeholder at root level
      @at-root %#{$property}-#{length(map-get($smart-cache, $property))} {
        #{$property}: $value;
      }
    }
 
    // Extend the placeholder
    @extend %#{$property}-#{index(map-get($smart-cache, $property), $value)};
  }

}

%inline-block {
  @include smart-cache((
    display: inline-block
  ));
}
%no-padding {
  @include smart-cache((
    padding: 0
  ));
}
%no-margin {
  @include smart-cache((
    margin: 0
  ));
}

body {
  @include smart-extend('inline-block');
  @include smart-extend('no-margin');
  @include smart-extend('no-padding');
}

div, p {
  @include smart-extend('inline-block');
  @include smart-extend('no-margin');
}

ul {
  @include smart-extend('inline-block');
  @include smart-extend('no-margin');
  /* more rules */
}

SassMeister-output.css

body, div, p, ul {
  display: inline-block;
}

body {
  padding: 0;
}

body, div, p, ul {
  margin: 0;
}

ul {
  /* more rules */
}