[Haskell-cafe] Somewhat random history question - chicken and egg

[Henning Thielemann]

On Sun, 11 Nov 2007, Andrew Coppin wrote:

> Somebody just asked me
>
> "...if GHC is written in Haskell, how the heck did they compile GHC in
> the first place?"

... and what happens, if they add a new feature, use it in the compiler
itself, and then it turns out, that the implementation of the new feature
was buggy?