private function IsRecursive( $env, $mixin ){

		foreach($env->frames as $recur_frame){
			if( !($mixin instanceof Less_Tree_Mixin_Definition) ){

				if( $mixin === $recur_frame ){
					return true;
				}

				if( isset($recur_frame->originalRuleset) && $mixin->ruleset_id === $recur_frame->originalRuleset ){
					return true;
				}
			}
		}

		return false;
	}