[swift-users] Calling (Void) -> () with Void

Saagar Jha saagar at saagarjha.com
Sun Jul 9 19:43:33 CDT 2017


I’m having some odd results with closures that take Void as a parameter, and was wondering if this was expected behavior or a bug. Specifically, I have the following closure:

> Welcome to Apple Swift version 4.0 (swiftlang-900.0.45.6 clang-900.0.26).
> let foo: (Void) -> () = {}

Trying to call foo without parameters fails, of course:

> foo()
error: missing argument for parameter #1 in call

However, the fix-it doesn’t seem to work:

> foo(Void) // or even: foo(Void())
error: argument passed to call that takes no arguments


> foo(()) // Executes with no errors

works. Since Void is a typealias for () this should work, shouldn’t it? Just wanted to confirm that I’m not going crazy here.

Saagar Jha

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