```d
struct A {}
class B {
A opCast(T : A)() {
return A();
}
}
void main() {
auto b = new B();
destroy(b);
}
```
fails with
```
dmd2\windows\bin\..\..\src\druntime\import\object.d(4209): Error:
template instance `opCast!(void*)` does not match template
declaration `opCast(T : A)()`
main.d(9): Error: template instance `object.destroy!(true, B)`
error instantiating
```
Looks like a similar bug has been reported:
https://issues.dlang.org/show_bug.cgi?id=22635
As a workaround, adding an additional opCast:
```d
class B {
A opCast(T : A)() {
return A();
}
auto opCast(T)() {
return cast(T)super;
}
}
```
SEEMS to work. Is that safe? Or are consequences not what I'm
intending?
