13MaxG

When running `pip install orderedstructs` I got ``` In file included from src/cpp/SkipList.h:546, from src/cpp/SkipList.cpp:15: src/cpp/Node.h:47: error: ignoring ‘#pragma mark ’ [-Werror=unknown-pragmas] 47 | #pragma mark - | compilation terminated...

Fn Runner Watermark issue

5

Proposing a solution to https://github.com/apache/beam/issues/26190 . It appears the Flatten was not setting a watermark, which caused following steps not to execute. The issue was returning errors on beam versions...