Cargo Features

[dependencies]
tello = { version = "0.6.3", default-features = false, features = ["tokio_async"] }
default = tokio_async

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

tokio_async default = tokio, tokio-stream

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 tokio_async
tokio-stream tokio_async