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FB10447228.md

Implicitly opened existentials do not work in playgrounds

FB10447228

Running the following code in Swift playgrounds (in Xcode):

func open<A: Equatable>(_ a: A) {}

func existentialFun(_ value: Any) {
  guard let value = value as? any Equatable
  else { return }
  open(value)
}

Produces the following error:

error: type 'any Equatable' cannot conform to 'Equatable’

But does compile in a regular Swift project.

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