Cargo Features

[dependencies]
stm32f030-hal = { version = "0.7.1", default-features = false, features = ["rt", "stm32f030c6", "stm32f030r8", "stm32f030rc"] }
default = rt, stm32f030rc

These default features are set whenever stm32f030-hal is added without default-features = false somewhere in the dependency tree.

rt default
stm32f030f4 stm32f030k6 stm32f030c6
stm32f030c8 stm32f030cc stm32f030r8
stm32f030rc default

stm32f030-hal has 5 features without comments.