Cargo Features

[dependencies]
rocket_i18n = { version = "0.4.1", default-features = false, features = ["actix-web", "rocket"] }
default = rocket

The rocket feature is set by default whenever rocket_i18n is added without default-features = false somewhere in the dependency tree.

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.

actix-web implicit feature

Enables actix-web ^0.7

actix-web:

Actix Web is a powerful, pragmatic, and extremely fast web framework for Rust

rocket default

Enables rocket ^0.4.0