Cargo Features

manul has no features set by default.

[dependencies]
manul = { version = "0.0.1", features = ["rustcrypto-traits"] }
rustcrypto-traits = digest, signature

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.

digest rustcrypto-traits?
signature rustcrypto-traits?