Scala ActionListener / anonymous function type mismatch?

Duck-typing has nothing to do with the reason that your code doesn't work. It is because Scala's type system doesn't provide implicit conversion between interface type and function type by default. However, if the following implicit conversion is defined, your code works correctly.

Scala isn't duck-typed. It has optional, explicit structural-typing, but that doesn't have anything to do with why your code does not work.

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