diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.fill/fill_n.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.fill/fill_n.pass.cpp
deleted file mode 100644
index 89c7b854586711..00000000000000
--- a/libcxx/test/std/algorithms/alg.modifying.operations/alg.fill/fill_n.pass.cpp
+++ /dev/null
@@ -1,168 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// <algorithm>
-
-// template<class Iter, IntegralLike Size, class T>
-//   requires OutputIterator<Iter, const T&>
-//   constexpr OutputIterator      // constexpr after C++17
-//   fill_n(Iter first, Size n, const T& value);
-
-#include <algorithm>
-#include <cassert>
-#include <deque>
-
-#include "test_macros.h"
-#include "test_iterators.h"
-#include "user_defined_integral.h"
-
-#if TEST_STD_VER > 17
-TEST_CONSTEXPR bool test_constexpr() {
-  const std::size_t N = 5;
-  int ib[]            = {0, 0, 0, 0, 0, 0}; // one bigger than N
-
-  auto it = std::fill_n(std::begin(ib), N, 5);
-  return it == (std::begin(ib) + N) && std::all_of(std::begin(ib), it, [](int a) { return a == 5; }) &&
-       *it == 0 // don't overwrite the last value in the output array
-      ;
-}
-#endif
-
-typedef UserDefinedIntegral<unsigned> UDI;
-
-template <class Iter>
-void test_char() {
-  char a[4] = {};
-  Iter it   = std::fill_n(Iter(a), UDI(4), char(1));
-  assert(base(it) == a + 4);
-  assert(a[0] == 1);
-  assert(a[1] == 1);
-  assert(a[2] == 1);
-  assert(a[3] == 1);
-}
-
-template <class Iter>
-void test_int() {
-  int a[4] = {};
-  Iter it  = std::fill_n(Iter(a), UDI(4), 1);
-  assert(base(it) == a + 4);
-  assert(a[0] == 1);
-  assert(a[1] == 1);
-  assert(a[2] == 1);
-  assert(a[3] == 1);
-}
-
-void test_int_array() {
-  int a[4] = {};
-  assert(std::fill_n(a, UDI(4), static_cast<char>(1)) == a + 4);
-  assert(a[0] == 1);
-  assert(a[1] == 1);
-  assert(a[2] == 1);
-  assert(a[3] == 1);
-}
-
-struct source {
-  source() : i(0) {}
-
-  operator int() const { return i++; }
-  mutable int i;
-};
-
-void test_int_array_struct_source() {
-  int a[4] = {};
-  assert(std::fill_n(a, UDI(4), source()) == a + 4);
-  assert(a[0] == 0);
-  assert(a[1] == 1);
-  assert(a[2] == 2);
-  assert(a[3] == 3);
-}
-
-struct test1 {
-  test1() : c(0) {}
-  test1(char xc) : c(xc + 1) {}
-  char c;
-};
-
-void test_struct_array() {
-  test1 test1a[4] = {};
-  assert(std::fill_n(test1a, UDI(4), static_cast<char>(10)) == test1a + 4);
-  assert(test1a[0].c == 11);
-  assert(test1a[1].c == 11);
-  assert(test1a[2].c == 11);
-  assert(test1a[3].c == 11);
-}
-
-class A {
-  char a_;
-
-public:
-  A() {}
-  explicit A(char a) : a_(a) {}
-  operator unsigned char() const { return 'b'; }
-
-  friend bool operator==(const A& x, const A& y) { return x.a_ == y.a_; }
-};
-
-void test5() {
-  A a[3];
-  assert(std::fill_n(&a[0], UDI(3), A('a')) == a + 3);
-  assert(a[0] == A('a'));
-  assert(a[1] == A('a'));
-  assert(a[2] == A('a'));
-}
-
-struct Storage {
-  union {
-    unsigned char a;
-    unsigned char b;
-  };
-};
-
-void test6() {
-  Storage foo[5];
-  std::fill_n(&foo[0], UDI(5), Storage());
-}
-
-void test_deque() {
-  std::deque<int> dq(5);
-  std::fill_n(dq.begin(), dq.size(), 4);
-  assert(dq[0] == 4);
-  assert(dq[1] == 4);
-  assert(dq[2] == 4);
-  assert(dq[3] == 4);
-  assert(dq[4] == 4);
-}
-
-int main(int, char**) {
-  test_char<cpp17_output_iterator<char*> >();
-  test_char<forward_iterator<char*> >();
-  test_char<bidirectional_iterator<char*> >();
-  test_char<random_access_iterator<char*> >();
-  test_char<char*>();
-
-  test_int<cpp17_output_iterator<int*> >();
-  test_int<forward_iterator<int*> >();
-  test_int<bidirectional_iterator<int*> >();
-  test_int<random_access_iterator<int*> >();
-  test_int<int*>();
-
-  test_int_array();
-  test_int_array_struct_source();
-  test_struct_array();
-
-  test5();
-  test6();
-
-  test_deque();
-
-#if TEST_STD_VER > 17
-  static_assert(test_constexpr());
-#endif
-
-  return 0;
-}