Merge pull request swiftlang#20243 from arguiot/patch-1

Updated SwiftPrivate.swift using String Interpolation

Author: moiseev

stdlib/private/SwiftPrivate/SwiftPrivate.swift

@@ -2,7 +2,7 @@
 //
 // This source file is part of the Swift.org open source project
 //
-// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
+// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
 // Licensed under Apache License v2.0 with Runtime Library Exception
 //
 // See https://swift.org/LICENSE.txt for license information
@@ -14,18 +14,18 @@ import Swift
 import SwiftShims
 
 /// Convert the given numeric value to a hexadecimal string.
-  // FIXME(integers): support a more general BinaryInteger protocol
+// FIXME(integers): support a more general BinaryInteger protocol
 public func asHex<T : FixedWidthInteger>(_ x: T) -> String {
-  return "0x" + String(x, radix: 16)
+  return "0x\(String(x, radix: 16))"
 }
 
 /// Convert the given sequence of numeric values to a string representing
 /// their hexadecimal values.
-  // FIXME(integers): support a more general BinaryInteger protocol
+// FIXME(integers): support a more general BinaryInteger protocol
 public func asHex<S : Sequence>(_ x: S) -> String
   where
   S.Element : FixedWidthInteger {
-  return "[ " + x.lazy.map { asHex($0) }.joined(separator: ", ") + " ]"
+  return "[ \(x.lazy.map { asHex($0) }.joined(separator: ", ")) ]"
 }
 
 /// Compute the prefix sum of `seq`.
@@ -63,14 +63,12 @@ public func withArrayOfCStrings<R>(
   let argsCounts = Array(args.map { $0.utf8.count + 1 })
   let argsOffsets = [ 0 ] + scan(argsCounts, 0, +)
   let argsBufferSize = argsOffsets.last!
-
   var argsBuffer: [UInt8] = []
   argsBuffer.reserveCapacity(argsBufferSize)
   for arg in args {
     argsBuffer.append(contentsOf: arg.utf8)
     argsBuffer.append(0)
   }
-
   return argsBuffer.withUnsafeMutableBufferPointer {
     (argsBuffer) in
     let ptr = UnsafeMutableRawPointer(argsBuffer.baseAddress!).bindMemory(