Index: libcxx/test/std/ranges/range.factories/range.istream.view/utils.h
===================================================================
--- libcxx/test/std/ranges/range.factories/range.istream.view/utils.h
+++ libcxx/test/std/ranges/range.factories/range.istream.view/utils.h
@@ -6,11 +6,7 @@
 
 template <class CharT, std::size_t N>
 auto make_string(const char (&in)[N]) {
-  std::basic_string<CharT> r(N - 1, static_cast<CharT>(0));
-  for (std::size_t i = 0; i < N - 1; ++i) {
-    r[i] = static_cast<CharT>(in[i]);
-  }
-  return r;
+  return std::basic_string<CharT>(in + 0, in + (N - 1));
 }
 
 template <class CharT, std::size_t N>