import issue?

[DLearner via Digitalmars-d-learn]

Please,
Why does:

```
// Test module Ex_mod
struct SA {
   int   SAIntFld1;
   int   SAIntFld2;
}
bool AddEle(ref void* StartPtr, SA PayLoad1) {

   import core.stdc.stdlib : malloc;

   struct Ele {
      SA   PayLoad;
      Ele* EleNxtPtr;
      Ele* ElePrvPtr;
   }

   Ele*    ElePtr;
   Ele*  wkElePtr;

   return true;
}

```

imported into:
```
// Test harness

struct SA {
   int   SAIntFld1;
   int   SAIntFld2;
}


void main() {

   import std.stdio: writeln;

   import Ex_mod;

   SA SAVar;
   void* SA_StartPtr = null;

   SAVar.SAIntFld1 = 3;
   SAVar.SAIntFld2 = -5;

   if (AddEle(SA_StartPtr, SAVar)) {
      writeln("Element linked");
   } else {
      writeln("Element not linked");
   }

}
```

Fail with:
```
ex_main.d(21): Error: function `Ex_mod.AddEle(ref void* StartPtr, 
SA PayLoad1)` is not callable using argument types `(void*, SA)`
ex_main.d(21):        cannot pass argument `SAVar` of type 
`ex_main.SA` to parameter `Ex_mod.SA PayLoad1`

```

When eliminating the import via:

```
// Test harness

struct SA {
   int   SAIntFld1;
   int   SAIntFld2;
}

bool AddEle(ref void* StartPtr, SA PayLoad1) {

   import core.stdc.stdlib : malloc;

   struct Ele {
      SA   PayLoad;
      Ele* EleNxtPtr;
      Ele* ElePrvPtr;
   }

   Ele*    ElePtr;
   Ele*  wkElePtr;

   return true;
}


void main() {

   import std.stdio: writeln;

//   import Ex_mod;

   SA SAVar;
   void* SA_StartPtr = null;

   SAVar.SAIntFld1 = 3;
   SAVar.SAIntFld2 = -5;

   if (AddEle(SA_StartPtr, SAVar)) {
      writeln("Element linked");
   } else {
      writeln("Element not linked");
   }

}
```

works correctly?