Cargo Features

[dependencies]
ark-r1cs-std-zypher = { version = "0.4.0", default-features = false, features = ["std", "parallel"] }
default = std

The std feature is set by default whenever ark-r1cs-std-zypher is added without default-features = false somewhere in the dependency tree.

std default parallel?

Enables std of ark-ff-zypher, ark-relations-zypher, ark-std-zypher, and num-bigint

parallel = std

Enables parallel of ark-ff-zypher and ark-std-zypher

ark-r1cs-std-zypher has 3 features without comments.