Cargo Features

mockers_derive has no features set by default.

mockers_derive = { version = "0.23.0", features = ["debug", "nightly"] }
debug = prettyplease

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.

prettyplease debug?