BuiltInFunction d = f.getAnnotation(BuiltInFunction.class);

        if (d == null) {

            return;

        }

        BuiltInFunctionInfo value = new BuiltInFunctionInfo(f, d);

        do {

            // Add function to function map, throwing if conflicts found

            // Add entry for each possible version of function based on arguments that are not required to be present (i.e. arg with default value)

            BuiltInFunctionKey key = new BuiltInFunctionKey(value.getName(), nArgs);

            BuiltInFunctionKey key = new BuiltInFunctionKey(value.getName(), nArgs);

            if (BUILT_IN_FUNCTION_MAP.put(key, value) != null) {

                throw new IllegalStateException("Multiple " + value.getName() + " functions with " + nArgs + " arguments");

            }

        // Look for default values that aren't at the end and throw

        while (--nArgs >= 0) {

            if (d.args()[nArgs].defaultValue().length() > 0) {

                throw new IllegalStateException("Function " + value.getName() + " has non trailing default value of '" + d.args()[nArgs].defaultValue() + "'. Only trailing arguments may have default values");

        } while (--nArgs >= 0 && d.args()[nArgs].defaultValue().length() > 0);

        // Look for default values that aren't at the end and throw

        while (--nArgs >= 0) {

                throw new IllegalStateException("Function " + value.getName() + " has non trailing default value of '" + d.args()[nArgs].defaultValue() + "'. Only trailing arguments may have default values");

            }

        }

    }

    /**

 

        // Look for default values that aren't at the end and throw

        while (--nArgs >= 0) {

            if (d.args()[nArgs].defaultValue().length() > 0) {

            }

        }

    }

    /**

     * Reflect this class and populate static structures from it.