Cargo Features

cmudict-fast has no features set by default.

[dependencies]
cmudict-fast = { version = "0.8.0", features = ["serialization"] }
serialization = 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 serialization?