Cargo Features

pbp has no features set by default.

[dependencies]
pbp = { version = "0.4.0", features = ["dalek"] }
dalek = ed25519-dalek

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.

ed25519-dalek dalek?

Enables ed25519-dalek ^0.7.0