Cargo Features

[dependencies]
async-atomic = { version = "0.1.5", default-features = false, features = ["std", "alloc", "fallback"] }
default = fallback, std

These default features are set whenever async-atomic is added without default-features = false somewhere in the dependency tree.

std default = alloc

Enables std of atomic ^0.5.1 and futures

alloc std

Affects subscriber::Subscriber

fallback default

Enables fallback of atomic ^0.5.1