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Traits can be used for polymorphism: https://play.rust-lang.org/?gist=5d4bae81014d879b43bad1326dd6f936&version=stable https://play.rust-lang.org/?gist=5d4bae810

• Ygg2 9y ago
  True, but what people ask for when they ask for OO is for structs to be extendable.