Cargo Features

[dependencies]
secp256k1-plus = { version = "0.5.7", default-features = false, features = ["unstable", "singleton", "dev"] }
default = singleton

The singleton feature is set by default whenever secp256k1-plus is added without default-features = false somewhere in the dependency tree.

unstable
singleton default = lazy_static
dev = clippy

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.

clippy dev?
lazy_static singleton

Enables lazy_static ^0.2