Cargo Features

[dependencies]
countries = { version = "0.1.3", default-features = false, features = ["std", "alloc", "flags", "serde", "async-graphql"] }
default = std

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

std default = alloc
alloc std
flags = bitflags

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.

bitflags flags?

Enables bitflags ^1.3

serde implicit feature

Enables serde

serde:

A generic serialization/deserialization framework

async-graphql implicit feature

Enables async-graphql ^4

async-graphql:

A GraphQL server library implemented in Rust