Cargo Features

[dependencies]
temperature = { version = "0.10.2", default-features = false, features = ["hotspot", "threed-ice"] }
default = hotspot, threed-ice

These default features are set whenever temperature 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.

hotspot default
threed-ice default