Cargo Features

[dependencies]
cassandra-proto = { version = "0.1.2", default-features = false, features = ["v3", "v4", "appveyor"] }
default = v4

The v4 feature is set by default whenever cassandra-proto is added without default-features = false somewhere in the dependency tree.

v3
v4 default
appveyor

cassandra-proto has 4 features without comments.