Static DUPLICATE_FEATURES 

pub static DUPLICATE_FEATURES: &'static Lint

The duplicate_features lint detects duplicate features found in crate-level feature attributes.

Note: This lint used to be a hard error (E0636).

Example

#![feature(rustc_attrs)]
#![feature(rustc_attrs)]

{{produces}}

Explanation

Enabling a feature more than once is a no-op. To avoid this warning, remove the second feature() attribute.