Cargo Features

STM32L4x6 has no features set by default.

[dependencies]
stm32l4x6 = { version = "0.6.0", features = ["rt"] }
rt

Enables device of cortex-m-rt >=0.5.0, <0.7.0

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.

cortex-m-rt rt?

Enables cortex-m-rt >=0.5.0, <0.7.0