diff --git a/libcxx/test/std/algorithms/algorithms.results/in_out_result.pass.cpp b/libcxx/test/std/algorithms/algorithms.results/in_out_result.pass.cpp
--- a/libcxx/test/std/algorithms/algorithms.results/in_out_result.pass.cpp
+++ b/libcxx/test/std/algorithms/algorithms.results/in_out_result.pass.cpp
@@ -53,8 +53,9 @@
   // Conversion, fundamental types.
   {
     std::ranges::in_out_result<int, bool> x = {2, false};
-    std::ranges::in_out_result<double, char> y = x;
-    assert(y.in == 2.0);
+    // FIXME(varconst): try a narrowing conversion.
+    std::ranges::in_out_result<long, char> y = x;
+    assert(y.in == 2);
     assert(y.out == '\0');
   }
 
@@ -138,4 +139,3 @@
 
   return 0;
 }
-