Cargo Features

samd21g18a has no features set by default.

[dependencies]
samd21g18a = { version = "0.2.1", features = ["rt", "rt-abort-on-panic"] }
rt = cortex-m-rt

Affects interrupt::INTERRUPTS

rt-abort-on-panic

Enables abort-on-panic of cortex-m-rt 0.3.*

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? rt-abort-on-panic?

Enables cortex-m-rt 0.3.*