Does Poetry support recursive extras?

• I have searched the issues of this repo and believe that this is not a duplicate.
• I have searched the documentation and believe that my question is not covered.

Issue

Does Poetry support recursive (for lack of a better term, it’s early) extras best exemplified by this pyproject.toml snippet?

[tool.poetry.dependencies]
attrs = "~19.3"
pandas = "~1.1"
# optional
quandl = { version = "~3.5.2", optional = true }
matplotlib = { version = "~3.3.0", optional = true }
networkx = { version = "~2.4.0", optional = true }
scikit-learn = { version = "~0.22.0", optional = true }

[tool.poetry.extras]
quandl = ["quandl"]
viz = ["matplotlib", "networkx"]
ml = ["viz", "scikit-learn"]
all = ["ml", "quandl"]

[sinoroc]

For comparison, this is how it can be done with setuptools setup.cfg: https://stackoverflow.com/a/61610341/

[sinoroc]

Personally I am not convinced there is a need for such a feature with such a notation. Seems to be adding more confusion. You may want to give the UX a second look

See if it would make sense in the context of the dependencies groups feature (planned for v1.2).

---

If I were to change extras in order to avoid repetition for dependencies that are in multiple extras (in a way this is what you are trying to solve, right?), this is what I would aim for, but I think the dependencies groups feature already covers this (I have not read the full discussion on this, so I might be wrong):

libraryA = { "*", in_extras = [ "alpha", "bravo" ] }
ilbraryB = { "*", in_extras = [ "alpha" ] }