Cargo Features

xxcalc has no features set by default.

[dependencies]
xxcalc = { version = "0.2.1", features = ["interactive"] }
interactive = rustyline

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.

rustyline interactive?

Enables rustyline ^1.0.0