Cargo Features

Lain has no features set by default.

[dependencies]
lain = { version = "0.5.5", features = ["default_features", "serde_support"] }
default_features
serde_support = 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 serde_support?