Remove allocatePortRightPair(), as move only types are not permitted in tuples

Author: loffgren

Sources/System/MachPort.swift

@@ -122,24 +122,6 @@ public enum Mach {
   /// receiving end.
   @frozen
   public struct SendOnceRight: MachPortRight {}
-
-  /// Create a connected pair of rights, one receive, and one send.
-  ///
-  /// This function will abort if the rights could not be created.
-  /// Callers may assert that valid rights are always returned.
-  public static func allocatePortRightPair() ->
-    (receive: Mach.Port<Mach.ReceiveRight>, send: Mach.Port<Mach.SendRight>) {
-    var name = mach_port_name_t(MACH_PORT_NULL)
-    let secret = mach_port_context_t(arc4random())
-    withUnsafeMutablePointer(to: &name) { name in
-      var options = mach_port_options_t()
-      options.flags = UInt32(MPO_INSERT_SEND_RIGHT);
-      withUnsafeMutablePointer(to: &options) { options in
-        _machPrecondition(mach_port_construct(mach_task_self_, options, secret, name))
-      }
-    }
-    return (Mach.Port(name: name, context: secret), Mach.Port(name: name))
-  }
 }
 
 extension Mach.Port where RightType == Mach.ReceiveRight {

Tests/SystemTests/MachPortTests.swift

@@ -121,19 +121,6 @@ final class MachPortTests: XCTestCase {
         }
     }
 
-    func testMakePair() throws {
-        let (recv, send) = Mach.allocatePortRightPair()
-        XCTAssert(recv.makeSendCount == 1)
-        recv.withBorrowedName { rName in
-            send.withBorrowedName { sName in
-                XCTAssert(rName != 0xFFFFFFFF)
-                XCTAssert(rName != MACH_PORT_NULL)
-                // send and recv port names coalesce
-                XCTAssert(rName == sName)
-            }
-        }
-    }
-
     func testCopySend() throws {
         let recv = Mach.Port<Mach.ReceiveRight>()
         let zero = recv.makeSendCount