Cargo Features

[dependencies]
popcnt = { version = "0.1.0", default-features = false, features = ["std", "nightly"] }
default = std

The std feature is set by default whenever popcnt is added without default-features = false somewhere in the dependency tree.

std default

Enables std of pulp

nightly

Enables nightly of pulp

PopCnt has 3 features without comments.