 }
 
 BitsetTests.test("Word.capacity") {
-  expectEqual(_Bitset.Word.capacity, UInt.bitWidth)
+  expectEqual(_UnsafeBitset.Word.capacity, UInt.bitWidth)
 }
 
 BitsetTests.test("Word.uncheckedContains(_:)") {
-  typealias Word = _Bitset.Word
+  typealias Word = _UnsafeBitset.Word
   for i in 0 ..< Word.capacity {
     expectEqual(Word(0).uncheckedContains(i), false, "i=\(i)")
     expectEqual(Word(1).uncheckedContains(i), i == 0, "i=\(i)")

}

BitsetTests.test("Word.count") {
  typealias Word = _Bitset.Word
  var word = Word(0)
  for i in 0 ..< Word.capacity {
    expectEqual(word.count, i)

}

BitsetTests.test("Word.uncheckedInsert(_:)") {
  typealias Word = _UnsafeBitset.Word
  var word = Word(0)
  for i in 0 ..< Word.capacity {
    expectFalse(word.uncheckedContains(i))
