add missing cstddef import

hnrklssn · hnrklssn · commit dd34be43e2ee · 2025-10-08T15:39:51.000-07:00
diff --git a/test/Interop/CxxToSwiftToCxx/span/span-execution.cpp b/test/Interop/CxxToSwiftToCxx/span/span-execution.cpp
@@ -11,9 +11,8 @@
 
 // REQUIRES: executable_test
 
-// REQUIRES: OS=macosx || rdar-161999258
-
 //--- header.h
+#include <cstddef>
 #include <string>
 #include <span>
 
