Comment # 6 on bug 196 from Iain Buclaw

Something wacky going on in the backend:

```
    .globl
__D4core6thread13onThreadErrorFNbAyaC6object9ThrowableZ5errorC4core6thread11ThreadError
    .data
    .align 3
__D4core6thread13onThreadErrorFNbAyaC6object9ThrowableZ5errorC4core6thread11ThreadError:
    .quad    .4648
    .const_data
    .align 5
.4648:   /* Line 23283 */
    .quad    __D4core6thread11ThreadError6__vtblZ
    .quad    0
    .space 16
    .quad    62
    .quad    LC13
    .quad    2765
    .space 8
    .space 8
    .space 8
```