[Issue 23442] New: 1 day agoDMD dll GC bug when calling a function from an interface that creates a new object

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23442

          Issue ID: 23442
           Summary: 1 day agoDMD dll GC bug when calling a function from
                    an interface that creates a new object
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: msnmancini at hotmail.com

Common code:

```d
module common;
interface IFont
{
  IFont createFontWithSize(int size);
}
```

Executable Code:
```
import common;
class TTFFont : IFont
{
  IFont createFontWithSize(int size){return new TTFFont;}
}

export extern(System) IFont newFont()
{
  auto ret = new TTFFont();
  GC.addRoot(ret);
  return ret;
}
```

DLL Code:
```
import common;

Runtime.initialize();
IFont function() newFont;
newFont = loadSymbol("newFont");
IFont myFont = newFont(); //GC root ok, does not get collected
IFont otherFont = myFont.createFontWithSize(32); //Gets collected after some
time
```

As my object that creates another object is rooted, should not it create
another rooted object?

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