Cargo Features

GetSize has no features set by default.

[dependencies]
get-size = { version = "0.1.4", features = ["derive"] }
derive = get-size-derive

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.

get-size-derive derive?