UnwrapOrTrap.swift

//
// UnwrapOrTrap.swift
//

infix operator ?! : NilCoalescingPrecedence

/// Performs a nil-coalescing operation, returning the wrapped value of an
/// `Optional` instance or uses the rhs function to stop the program.
///
/// - Parameters:
///   - optional: An optional value.
///   - noreturn: A function to stop the programm.
func ?!<T>(optional: T?, noreturn: @autoclosure () -> Never) -> T {
   switch optional {
   case .some(let value):
      return value
   case .none:
      noreturn()
   }
}