Cargo Features

abistr = { version = "0.2.0-rc3", default-features = false, features = ["std", "bytemuck", "widestring"] }
default = std

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

std default

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features.

bytemuck implicit feature
widestring implicit feature

With default (std)