Cargo Features

[dependencies]
max78000-pac = { version = "0.3.0", default-features = false, features = ["critical-section", "rt"] }
default = critical-section, rt

These default features are set whenever max78000-pac is added without default-features = false somewhere in the dependency tree.

critical-section default

Enables critical-section

rt default

Enables device of cortex-m-rt

max78000-pac has 3 features without comments.