Cargo Features

ansi_term has no features set by default.

[dependencies]
ansi_term = { version = "0.12.1", features = ["derive_serde_style"] }
derive_serde_style = serde

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.

serde derive_serde_style?