docs: public static boolean isFunctionalInterface(JvmGenericType type, IActionPrototypeProvider sarlSignatureProvider) {
  		if (type != null && type.isInterface()) {
  			final Map<ActionPrototype, JvmOperation> operations = new HashMap<>();
  			populateInterfaceElements(type, operations, null, sarlSignatureProvider);
  			if (operations.size() == 1) {
  				final JvmOperation op = operations.values().iterator().next();
  				return !op.isStatic() && !op.isDefault();
  			}
  		}
  		return false;
  	}