Cargo Features

Machine-check has no features set by default.

[dependencies]
machine-check = { version = "0.4.0-alpha.8", features = ["gui"] }
gui = machine-check-gui

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.

machine-check-gui gui?