static boolean isReturnTypeNothing(Method method) {
        try {
            return IS_RETURN_TYPE_NOTHING != null &&
                   (boolean) IS_RETURN_TYPE_NOTHING.invoke(null, method);
        } catch (Exception e) {
            return false;
        }
    }
Returns true if a method returns {@code kotlin.Nothing}.
core/src/main/java/com/linecorp/armeria/internal/server/annotation/KotlinUtil.java