Cargo Features

quasi_macros has no features set by default.

[dependencies]
quasi_macros = { version = "0.32.0", features = ["unstable-testing"] }
unstable-testing = clippy

Enables unstable-testing of quasi and quasi_codegen

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 unstable-testing?