Cargo Features

dbus-udisks2 has no features set by default.

[dependencies]
dbus-udisks2 = { version = "0.3.0", features = ["futures"] }
futures = futures-util

Enables futures of dbus

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-util futures?