Cargo Features

lazy-static has no features set by default.

[dependencies]
lazy_static = { version = "1.4.0", features = ["spin_no_std"] }
spin_no_std = spin

Affects lazy_static::lazy

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features.

spin spin_no_std?

Enables spin ^0.5.0