Servo was codeveloped with rust by Mozilla, to get a faster and safer engine. Servo basically showed where improvements needed to be done and then rustc was modified to fit the need.
crash from undocumented function parameter invariants
My favourite, as that was the exact point the dev was making in his talk, that the stuff is badly documented and that the function signature would document it perfectly.
No, it will not be available to everyone. Just the clients of the corpo and they can request the source. If you're not a client, you still have no rights.
Quick question, Answer of the top of your head: When was the last state sanctioned slave freed in America?