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+LALRPOP support conditional compilation of public non-terminal declarations via `#[cfg(feature = "FEATUERE")]` 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.
+
+```rust
+#[cfg(feature = "FEATURE")]
+pub MyRule : () = {
+    ...
+};
+```