```
template __externC(RT, P...)
{
    alias __externC = extern(C) RT function(P);
}

extern(C) void* test(scope const char*);

static assert(is(typeof(&test)   == __externC!(void*, scope const char*)));
```

Last line fails with:

Error: expression expected, not scope
Error: found const when expecting ) following template argument list
Error: found char when expecting )
Error: expression expected, not )
Error: found ) when expecting ;