☠ Emoji to indicate private SCSS variables in the global scope ☠


   //  don't mess with this one!
$☠include-once: ();

   
@mixin include-once($name){ 
    @if not index($☠include-once, $name){
       @content;
       $☠include-once: append($☠include-once, $name) !global;
    } 
};


@mixin foo(){
    @include include-once(foo){
       /* do not include this foo again */
    }    
}
@mixin bar(){
    @include include-once(bar){
       /* do not include this bar again */
    }    
}

@include foo; 
@include foo;
@include foo;
@include bar; 
@include bar;
@include bar;