Cargo Features

ex_em_ell = { version = "0.3.0", default-features = false, features = ["derive"] }
default = derive

The derive feature is set by default whenever ex_em_ell is added without default-features = false somewhere in the dependency tree.

derive default = ex_em_ell_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.

ex_em_ell_derive derive