Rust: What is the difference between Future and Generator?

Future — async computation. Generator — lazy iteration.

Future:

• Async computation.
• Single value.
• Poll-based.

Generator:

• Lazy iteration.
• Multiple values.
• yield-based.

1// Future
2async fn compute() -> i32 {
3    42
4}
5
6// Generator (nightly)
7#![feature(generators)]
8let gen = || {
9    yield 1;
10    yield 2;
11    yield 3;
12};

Key: Future for async, Generator for lazy iteration.