[steveklabnik]

The borrow checker is very fast.

[throwawaymaths]

computationally. But it slows down the programmer. It is not a zero-cost human operation. If it were, we wouldn't need computers to do it.

[steveklabnik]

I don’t think it slows me down, it speeds me up. It’s well known that surfacing issues earlier in a process saves time compared to later in a process.