SCCS, the source motel! Programs check in and never check out!
I wanted to have virtual memory, at least as it's coupled with file systems.
No amount of source-level verification or scrutiny will protect you from using untrusted code.
One is that the perfect garden can be created overnight, which it can't.
You can't trust code that you did not totally create yourself.
FORTRAN was the language of choice for the same reason that three-legged races are popular.