Cargo Features

adskalman = { version = "0.15.1", default-features = false, features = ["std"] }
default = std

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

std default = log

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.

log std