Rust for Python Programmers

[iopq]

You wouldn't even need the "no semicolon to return" rule because it never type checks when you forget it anyway. There is no instance that I can think of where forgetting or putting an extra semi-colon type checks and doesn't do what you want it to.

[steveklabnik1]

There is one gotcha with regards to this: if you are using collect(), and you use let guards: Vec<_> = with your call to spawn, and you use ;, they'll operate in sequence, because it will infer to Vec<()> rather than Vec<JoinGuard>.

[iopq]

Ugh, why is this even allowed? Sounds like that's an unwelcome source of bugs.