Cargo Features

[dependencies]
socksv5 = { version = "0.3.1", default-features = false, features = ["tokio", "futures"] }
default = futures

The futures feature is set by default whenever socksv5 is added without default-features = false somewhere in the dependency tree.

tokio = tokio_compat

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.

futures default
tokio_compat tokio?

Enables tokio