Fix node-types bugs involving aliases and external tokens

cli/src/generate/rules.rs

@@ -1,3 +1,4 @@
+use super::grammars::VariableType;
 use smallbitvec::SmallBitVec;
 use std::collections::HashMap;
 use std::iter::FromIterator;
@@ -139,6 +140,16 @@ impl Rule {
     }
 }
 
+impl Alias {
+    pub fn kind(&self) -> VariableType {
+        if self.is_named {
+            VariableType::Named
+        } else {
+            VariableType::Anonymous
+        }
+    }
+}
+
 #[cfg(test)]
 impl Rule {
     pub fn terminal(index: usize) -> Self {