Cargo Features

rusoto_codegen has no features set by default.

[dependencies]
rusoto_codegen = { version = "0.8.0", features = ["unstable", "nightly-testing"] }
unstable
nightly-testing = clippy

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.

clippy nightly-testing?