Difference between Unit and ()

[Piotr Kukiełka]

Looks like scala threats () => Unit and Unit => Unit differently.

This is reproducible with both REPL and scalac.

Is that intended behavior or a bug?

scala> val f1 = () => ()

f1: () => Unit = <function0>

scala> val failure: Unit => Unit = f1

<console>:8: error: type mismatch;

 found   : () => Unit

 required: Unit => Unit

       val failure: Unit => Unit = f1

                                   ^

scala> val f2 = (_: Unit) => ()

f2: Unit => Unit = <function1>

scala> val success: Unit => Unit = f2

success: Unit => Unit = <function1>

Best regards,

Piotr

[Simon Schäfer]

http://stackoverflow.com/questions/4543228/whats-the-difference-between-and-unit

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