[Issue 19640] Linker error when compiling delegate with betterC

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19640

Radu Racariu <radu.racariu at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |radu.racariu at gmail.com

--- Comment #2 from Radu Racariu <radu.racariu at gmail.com> ---
As Razvan pointed out, that delegate will create a closure and allocate on the
GC heap.

This is fixable by changing `call` to look like

```
int call(scope int delegate() d)
```

Note the scope keyword.

Also, main should look like

```
extern(C) void main()
```

Please use the learn forums (https://forum.dlang.org/group/learn) before adding
a bug, this kind of information is easily available there.

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