Cargo Features

p3-maybe-rayon has no features set by default.

[dependencies]
p3-maybe-rayon = { version = "0.2.0", features = ["parallel"] }
parallel = rayon

Affects p3-maybe-rayon::prelude, p3-maybe-rayon::iter

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

rayon parallel?