Cargo Features

BufList has no features set by default.

buf-list = { version = "1.0.3", features = ["futures03", "tokio1"] }
futures03 = futures-io-03
tokio1 = tokio

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-io-03 futures03?

Enables futures-io

tokio tokio1?