How do you enable a Rust “crate feature”?

Question

I\'m trying to use rand::SmallRng. The documentation says

This PRNG is feature-gated: to use, you must enable the crate feature

Answer 1

Specify the dependencies in Cargo.toml like so:

[dependencies]
rand = { version = "0.7.2", features = ["small_rng"] }

Alternatively:

[dependencies.rand]
version = "0.7.2"
features = ["small_rng"]

Both work.