docs: public String getValidationDescription() {
  		final JvmOperation feature = getOperation();
  		String message = null;
  		if (!getDeclaredTypeParameters().isEmpty()) {
  			message = MessageFormat.format(Messages.CastOperatorLinkingCandidate_0,
  					getFeatureTypeParametersAsString(true),
  					feature.getSimpleName(),
  					getFeatureParameterTypesAsString(),
  					feature.getDeclaringType().getSimpleName());
  		} else {
  			message = MessageFormat.format(Messages.CastOperatorLinkingCandidate_1,
  					feature.getSimpleName(),
  					getFeatureParameterTypesAsString(),
  					feature.getDeclaringType().getSimpleName());
  		}
  		return message;
  	}