Cargo Features

[dependencies]
riemann_client = { version = "0.9.0", default-features = false, features = ["docopt", "serde"] }
default = docopt, serde

These default features are set whenever riemann_client is added without default-features = false somewhere in the dependency tree.

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.

docopt default
serde default