Google thinks Ken Thompson doesn't know C

Q: I know Google has a policy where every new employee has to get checked out on languages before they're allowed to check code in. Which means you had to get checked out on C [which you co-created].

Thompson: Yeah, I haven't been.

Q. You haven't been! You're not allowed to check in code?

Thompson: I'm not allowed to check in code, no... I just haven't done it. I've so far found no need to.

The doctrine of sets, the Mengenlehre, which postulates and explores the vast numbers that an immortal man would not reach even if he exhausted his eternities counting, and whose imaginary dynasties have the letters of the Hebrew alphabet as ciphers. It was not given to me to enter that delicate labyrinth.