rnapier

func dispatch_sync<R> (queue: dispatch_queue_t, block: Void -> R ) -> R {
  var result: R!
  dispatch_sync(queue) {
    result = block()
  }
  return result
}

func result() -> String {
  return

rnapier

Enhancing closure argument flexibility

• Proposal: TBD
• Authors: Matthew Johnson, Erica Sadun, Rob Napier
• Status: TBD
• Review manager: TBD

Introduction

This proposal loosens closure requirements to provide developer flexibility. It removes the _ in requirement

rnapier

// I know you meant it to be exaggerated, but I still think this is the better approach in practice:

enum ClassError: Error {
    case propertyNotFound(name: String)
    case typeMismatch(propertyName: String)
}

class Foo {
    var properties: [(String, Any)] = []
    private func validateValue(_ value: Any, for property: String) throws { // Note that I pass the name just for the error; that's ok IMO