Cargo Features

[dependencies]
tokio-futures-byteorder = { version = "0.2.0", default-features = false, features = ["futures", "tokio"] }
default = tokio

The tokio feature is set by default whenever tokio-futures-byteorder is added without default-features = false somewhere in the dependency tree.

futures = futures-io

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.

tokio default

Enables tokio ^0.2

futures-io futures?