Should importC fail on invalid C code?

[kdevel via Digitalmars-d-learn]

After reading Walter's remark "ImportC sees those macro 
definitions and transforms them into manifest constant 
declarations" in

    Issue 23622 - ImportC #defines conflict with declarations
I wondered how it was implemented:

`myccode.c`
```
int getx ()
{
   return X;
#define X 1
}
```

`imc.d`
```
unittest {
   import myccode;
   assert (false, "Should img.c really compile?");
}
```

```
dmd -O -checkaction=context -unittest -main myccode.c -run imc.d
imc.d(3): [unittest] Should img.c really compile?
1/1 modules FAILED unittests
```