Try the test foo program that works on Godbolt

Author: rexim

.github/workflows/nob.yaml

@@ -46,8 +46,8 @@ jobs:
         # https://learn.microsoft.com/en-us/cpp/build/building-on-the-command-line?view=msvc-170#create-your-own-command-prompt-shortcut
         run: |
           call "C:\\Program Files\\Microsoft Visual Studio\\2022\\Enterprise\\VC\\Auxiliary\\Build\\vcvars64.bat"
-          cl.exe /Fe:nob nob.c
-          nob.exe
+          cl.exe /Fe:foo foo.c
+          foo.exe
       - name: Build how_to-s
         shell: cmd
         run: |

foo.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+
+typedef struct  Arguments {
+    int* arg;
+
+    int thing;
+} Arguments;
+
+void func_(int benis, Arguments args)
+{
+    printf(".arg   = %p\n", args.arg);
+    printf(".thing = %d\n", args.thing);
+}
+
+#define func__(benis, ...) func_( (benis), (Arguments){0, __VA_ARGS__})
+
+int main() {
+    func__(123, .thing = 69);
+}