[Issue 2168] cast extern enhancement?

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=2168

--- Comment #5 from RazvanN <razvan.nitu1305 at gmail.com> ---
(In reply to Dennis from comment #4)
> (In reply to RazvanN from comment #3)
> > And then it will work without needing the cast.
> 
> That works in this reduced example, but when doing dynamic loading, you
> often load multiple functions with different signatures.

In that case, this seems to work:

```
extern(C) void* func(char*);

void main()
{
    char* p = cast(char*)"func".ptr;
    extern(C) int function() glFunctionFoo = cast(int function())func(p);
    extern(C) int function(int) glFunctionFoo2 = cast(int
function(int))func(p);
    pragma(msg, typeof(glFunctionFoo));
    pragma(msg, typeof(glFunctionFoo2));                                        
}
```

So, forcing the lhs of the assignment to extern(C) enables the cast to work.

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