Cargo Features

[dependencies]
nsq-async-rs = { version = "0.1.5", default-features = false, features = ["full", "discovery"] }
default = full

The full feature is set by default whenever nsq-async-rs is added without default-features = false somewhere in the dependency tree.

full default = discovery
discovery full = reqwest

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.

reqwest discovery?