allow-features

This feature is perma-unstable and has no tracking issue.

This flag allows limiting the features which can be enabled with #![feature(...)] attributes. By default, all features are allowed on nightly and no features are allowed on stable or beta (but see RUSTC_BOOTSTRAP).

Features are comma-separated, for example -Z allow-features=ffi_pure,f16. If the flag is present, any feature listed will be allowed and any feature not listed will be disallowed. Any unrecognized feature is ignored.