Is there any reason for this behavior?
```D
import std.stdio, core.thread.fiber;
Fiber one, two;
void main() {
one = new Fiber(
delegate() {
while(1) {
stderr.writefln("one says two.state = %s",
two.state);
two.call();
}
}
);
two = new Fiber(
delegate() {
while(1) {
stderr.writefln("two says one.state = %s",
one.state);
one.call();
}
}
);
one.call();
}
```
Execution of one is suspended when it calls two, but then two
reports the state of one is not HOLD.
```
one says two.state = HOLD
two says one.state = EXEC
one says two.state = EXEC
Segmentation fault
```
Is this a bug or a feature? If the last then why?
