LALRPOP support conditional compilation of public non-terminal declarations via #[cfg(feature = "FEATURE")]
attributes.
If run in a build script LALRPOP will automatically pickup the features from cargo
and use those. Alternatively an explicit set of features can be set using the Configuration
type.
#![allow(unused)] fn main() { #[cfg(feature = "FEATURE")] pub MyRule : () = { ... }; }