[swift-evolution] Allow Selectors to be used as Closures

[Chris Byatt]

It feels a lot more Swift-like to me to allow a Selector argument to have
the option of being a closure.

For example, instead of:

UIBarButtonItem(title: "Press", style: .Done, target: self, action:
"functionToCall")

func functionToCall() {
    // Do something}

We should be able to do:

UIBarButtonItem(title: "Press", style: .Done, target: self, action: {
    // Do Something})

For simple tasks it would be a lot neater, and indeed faster to code this
way.

Thanks,

Chris
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