binary operator '??' cannot be applied to functions?

Question

in playground:

func f1() {
    return
}
var f2:(()->())?

let f3 = f2 ?? f1

give output:

error: binary operator '??' cannot be applied to operands of type '(() -> ())?' and '() -> ()'

what went wrong?

794

Posted by

borgiscool

Reply

Answer 1

An interesting exploration of the behavior of the current Swift.

This is as interesting:

var f = f1
let f3 = f2 ?? f

Works as expected.

Also this:

let f = f1
let f3 = f2 ?? f

Shows the same error.

Maybe what is wrong is the current Swift.

Posted by

OOPer

Answer 2

Thanks for the confirmation. radar filed.

Posted by

borgiscool

Answer 3

This is a known bug in the compiler handling autoclosure around functions.

-Chris

Posted by

ChrisLattner

Replies