Cargo Features

[dependencies]
retry = { version = "2.0.0", default-features = false, features = ["random"] }
default = random

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

random default = rand

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.

rand random