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Having yard documentation combined with a sig inside the singleton class syntax, class << self, was giving the following warning:
[warn]: in YARD::Handlers::Ruby::DSLHandler: Undocumentable method, missing name
This PR aims to support singleton class syntax by handling the class definition of the singleton similar to before. In the previous implementation singleton class's contents were skipped as it's not of type list. Here in the #process method we explicitly call the existing handler logic if we encounter a singleton class.
Most of the diff is due to moving the handler logic into a separate function.
I tested more extensively locally but in terms of the PR I only unskipped the existing test. If wanted I can add more complex cases.