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Maintenance Ruby 3.4 gets fixes, but no new features. Switch to Ruby 4.0 →

instance method

Prism::DSL#when_node

when_node(source: default_source, node_id: 0, location: default_location, flags: 0, keyword_loc: location, conditions: [], then_keyword_loc: nil, statements: nil)

Create a new WhenNode node.