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I getting an error when I follow this example: <https://www.pantsbuild.org/docs/rules-api-file-system#createdigest>
```    digest = await Get(
        Digest,
        CreateDigest([FileContent(entry_points_txt_path, entry_points_txt_contents)]),
    )```
which gives me this error:
```  TypeError: Invalid Get. The third argument `CreateDigest([FileContent(path=contrib/runners/noop_runner.egg-info/entry_points.txt, content=(len:59), is_executable=False)])` must have the exact same type as the second argument, &lt;class 'pants.engine.internals.native_engine.PyDigest'&gt;, but had the type &lt;class 'pants.engine.fs.CreateDigest'&gt;.```
Am I doing something wrong with CreateDigest?

Oh that's not nice. I had to remove the trailing comma after CreateDigest:
```    digest = await Get(
        Digest,
        CreateDigest([FileContent(entry_points_txt_path, entry_points_txt_contents)])
    )```
Why does it think I provided three params when I have two commas?

Huh, that is not nice at all. That is our AST parsing logic <https://github.com/pantsbuild/pants/blob/5e0c5859b7e7868b26ed83d80fe16ab6a756a9c2/src/python/pants/engine/internals/selectors.py#L71-L114|https://github.com/pantsbuild/pants/blob/5e0c5859b7e7868b26ed83d80fe16ab6a756a9c2/src/python/pants/engine/internals/selectors.py#L71-L114>