docs: @Check(CheckType.FAST)
  	public void checkSuperType(SarlSkill skill) {
  		final int nbSuperTypes = checkSuperTypes(
  				skill,
  				SARL_SKILL__EXTENDS,
  				Utils.singletonList(skill.getExtends()),
  				Skill.class,
  				false);
  		checkImplementedTypes(
  				skill,
  				SARL_SKILL__IMPLEMENTS,
  				skill.getImplements(),
  				Capacity.class,
  				nbSuperTypes > 0 ? 0 : 1,
  						true);
  	}